Masimo Announces FDA Clearance of the rainbow Acoustic Monitoring^® RAS-45 Sensor for Infant and Neonatal Patients

Irvine, California – September 10, 2018 – Masimo (NASDAQ: MASI) announced today FDA clearance of RAS-45, an acoustic respiration sensor for rainbow Acoustic Monitoring^® (RAM^®), for infant and neonatal patients. RAM could previously be used to monitor adult and pediatric patients greater than 10 kg using RAS-125c and RAS-45 sensors. With clearance of the RAS-45 sensor for infant and neonatal patients, acoustic respiration rate measurement is now, for the first time, possible for patients of all sizes, including neonates, in the United States.

RAM noninvasively and continuously measures respiration rate using an innovative adhesive sensor with an integrated acoustic transducer, the RAS-45 and RAS-125c, applied to the patient’s neck area or, for infant and neonatal patients under 10 kg, the chest. Using acoustic signal processing that leverages Masimo Signal Extraction Technology^® (SET^®), the respiratory signal is separated and processed to display continuous respiration rate (RRa^®) and an acoustic respiration waveform, a visualization of the vibrations caused by the patient’s airflow. The acoustic sensor also allows clinicians to listen to the sound of a patient’s breathing, whether at the bedside, through a point-of-care device like the Radical-7^® Pulse CO-Oximeter^®, or remotely, from a Patient SafetyNet™ view station.

The RAS-45 sensor for infant and neonatal patients offers multiple benefits of particular importance for successfully monitoring these youngest and most fragile patients. With the clearance for newborns and neonates, RRa’s accuracy range has been expanded up to 120 breaths per minute, while still providing accuracy of ± 1 breath per minute, facilitating accurate measurement of the higher respiratory rates common in this population. The sensor itself is significantly smaller than the RAS-125c sensor, and in fact with a diameter of approximately 2.2 cm without adhesive is only slightly larger than a nickel. Similarly, it weighs so little, 13 grams, that its presence may be barely noticeable, and features an adhesive that is transparent, light, and flexible. The size, weight, and adhesive advantages make it particularly suitable for the smaller stature and delicate skin of infants and neonates.

RRa has been shown not only to be accurate^1,2 and reliable¹, but also easy-to-use¹, easy-to-tolerate^1,3, and to enhance patient compliance with respiration monitoring. In a study comparing pediatric patient tolerance of sidestream capnography with a nasal cannula to respiration rate monitoring with an RAS-125c acoustic sensor, 15 out of 40 patients removed the capnography cannula, while only one removed the RAM acoustic sensor.³ In a study of 98 patients consciously sedated during upper gastrointestinal endoscopy, researchers found that RRa monitoring with the RAS-125c sensor more accurately assessed respiration rate than impedance pneumography.²

Joe Kiani, Founder and CEO of Masimo, commented, “From the beginning, we have focused our R&D on neonates and children for many reasons, including our belief that helping clinicians care for children will provide more benefit to society. RAM harnesses the power of our breakthrough signal processing and sensor technology and applies it to a measurement that has either been unreliable or difficult to use, respiration measurement, the third vital sign.”

RAM is available on most rainbow SET™-ready platforms. Continuous monitoring of respiration rate can be helpful in cases such as sedation-based procedures and post-surgical patients receiving patient-controlled analgesia for pain management.^4,5

@MasimoInnovates || #Masimo

The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Macknet MR et al. Accuracy and Tolerance of a Novel Bioacoustic Respiratory Sensor in Pediatric Patients. Anesthesiology. 2007;107:A84 (abstract).
2. Goudra BG et al. Comparison of Acoustic Respiration Rate, Impedance Pneumography and Capnometry Monitors for Respiration Rate Accuracy and Apnea Detection during GI Endoscopy Anesthesia. Open J Anesthesiol. 2013;3:74-79.
3. Patino M et al. Accuracy of Acoustic Respiration Rate Monitoring in Pediatric Patients. Paediatr Anaesth. 2013 Sep 3.
4. Stoelting, RK et al. APSF newsletter. 2011. www.apsf.org.
5. The Joint Commission Sentinel Event Alert. Issue 49, August 8, 2012. www.jointcomission.org.

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,¹ improve CCHD screening in newborns,² and, when used for continuous monitoring with Masimo Patient SafetyNet™ in post-surgical wards, reduce rapid response activations and costs.^3,4,5 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁶ and is the primary pulse oximetry at 9 of the top 10 hospitals listed in the 2018-19 U.S. News and World Report Best Hospitals Honor Roll.⁷ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at http://www.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
2. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;338.
3. Taenzer AH et al. Impact of Pulse Oximetry Surveillance on Rescue Events and Intensive Care Unit Transfers: A Before-And-After Concurrence Study. Anesthesiology. 2010; 112(2):282-287.
4. Taenzer AH et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
5. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
6. Estimate: Masimo data on file.
7. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo RAS-45, RAM^®, and RRa^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo RAS-45, RAM, and RRa, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

New Study Compares Two Methods of Guiding Goal-Directed Fluid Therapy, Noninvasive Masimo PVi^® and Invasive Esophageal Doppler

Neuchatel, Switzerland – September 5, 2018 – Masimo (NASDAQ: MASI) announced today the findings of a study recently published in BMC Anesthesiology in which researchers at University Hospital Linköping, Sweden compared the performance of goal-directed fluid therapy (GDFT) using invasive esophageal Doppler to GDFT using Masimo PVi^® (pleth variability index, measured noninvasively and continuously using SET^® pulse oximetry sensors) in patients undergoing major abdominal surgery.¹

Noting the value of GDFT in aiming to determine “the optimal amount of fluid for an individual patient,” Dr. Hans Bahlmann and colleagues sought to compare the effects of two methods of GDFT, stroke volume optimization guided by invasive esophageal Doppler (control group) and fluid optimization guided by noninvasive PVi (intervention group), on patients who were scheduled for open abdominal surgery lasting two or more hours. The effects compared were incidence of complications and length of hospital stay.

The researchers collected data from 146 patients who had surgery between November 2011 and January 2015, who were randomly divided into the two groups. In the intervention group, PVi was noninvasively and continuously measured with a Masimo Radical-7® Pulse CO-Oximeter® with software version 7.8.0.1 and SET® sensors.  After an initial fluid bolus (given to all patients irrespective of PVi value), a fluid bolus was given if PVi was ≥ 10%, repeated at 5 minute intervals until PVi fell below 10% or did not decrease at all. In the control group, esophageal Doppler measurements were performed using a Deltex Medical CardioQ apparatus.  After an initial fluid bolus, Doppler measurement was performed after 5 minutes and fluid boluses were repeated until stroke volume did not increase by 10%, in accordance with published protocols.

Observers blinded to each patient’s group assessed complications for 30 postoperative days using a pre-specified list of complications, as well as length of hospital stay. The researchers found that noninvasive PVi and invasive Doppler performed with no statistical difference, with similar incidences of complications and lengths of stay between the two groups. In the intervention/PVi group, there were 64 complications (corresponding to 51% of patients), with a median length of stay of 8.0 days (interquartile range [IQR] 8.0 days). In the control/Doppler group, there were 70 complications (corresponding to 49% of patients), with a median length of stay of 8.0 days (IQR 9.5).

The researchers concluded, “No difference in clinical outcome, as defined by number of postoperative complications, and length of hospital stay, was found when goal directed fluid therapy was applied using PVI as an alternative to esophageal Doppler. PVI appears to be an acceptable alternative to esophageal Doppler for goal directed fluid therapy during major open abdominal surgery.”

In discussing other PVi-related clinical studies, the researchers also noted that “Based on these reports and our findings, a clinician wishing to pursue GDFT can choose PVI over esophageal Doppler in the large majority of patients undergoing major open abdominal surgery. PVI, in contrast to esophageal Doppler, is not sensitive to interference from diathermy and does not require frequent access to the patient’s head for probe repositioning. Also, PVI can be measured without single-use equipment avoiding the cost for single-use esophageal probes (USD 130 in our setting). However, as illustrated by the request for Doppler data in two PVI patients, the clinician might still want to have access to a reliable method for measuring intraoperative cardiac output to increase the amount of hemodynamic information during unusually complex situations or in cases of known vascular and/or myocardial dysfunction.”

As a study limitation, the researchers noted the absence of a control group with neither PVi nor Doppler guiding fluid therapy, and therefore “it is not possible to tell whether PVi and Doppler both result in similar improvements in outcome, or whether neither method improves outcome when compared to treatment without GDFT.” They also noted that because of determining sample size using a 10% difference in the number of complications at 30 days, “the study was not powered to detect smaller albeit still significant differences in postoperative outcome.”

PVi has not been cleared by the FDA to assess fluid responsiveness.

@MasimoInnovates || #Masimo

Reference
1. Bahlmann H, Hahn R, and Nilsson L. Pleth variability index or stroke volume optimization during open abdominal surgery: a randomized controlled trial. BMC Anesthesiology. (2018) 18:115. https://doi.org/10.1186/s12871-018-0579-4.

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,¹ improve CCHD screening in newborns,² and, when used for continuous monitoring with Masimo Patient SafetyNet™ in post-surgical wards, reduce rapid response activations and costs.^3,4,5 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁶ and is the primary pulse oximetry at 9 of the top 10 hospitals listed in the 2018-19 U.S. News and World Report Best Hospitals Honor Roll.⁷ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at http://www.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
2. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;338.
3. Taenzer AH et al. Impact of Pulse Oximetry Surveillance on Rescue Events and Intensive Care Unit Transfers: A Before-And-After Concurrence Study. Anesthesiology. 2010; 112(2):282-287.
4. Taenzer AH et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
5. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
6. Estimate: Masimo data on file.
7. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo ORi™. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo ORi, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

New Study Evaluates the Ability of Masimo ORi™ to Reflect Oxygenation
During Moderate Hyperoxia

Neuchatel, Switzerland – August 27, 2018 – Masimo (NASDAQ: MASI) announced today the findings of a study recently published in Anesthesia & Analgesia in which researchers at the University of Groningen, the Netherlands and Ghent University, Belgium investigated the ability of Masimo ORi™ (Oxygen Reserve Index) to show trends in oxygenation in the moderate hyperoxic region (partial pressure of oxygen in arterial blood [PaO₂] in the range of 100 to 200 mmHg).¹ ORi is available outside the U.S. and is intended as a noninvasive, relative indicator of a patient’s oxygen reserve during moderate hyperoxia. ORi can be trended and has optional alarms to notify clinicians of changes in oxygenation.

Noting that monitoring oxygenation using pulse oximetry alone "gives little information on PaO₂" during conditions of normoxia and hyperoxia, Dr. Jaap Jan Vos and colleagues sought to evaluate the correlation of ORi to PaO₂ during moderate hyperoxia. They collected data from 20 healthy adult volunteers, who breathed a series of standardized oxygen concentrations ranging from mildly hypoxic (inspired oxygen = 14%) to extremely hyperoxic (inspired oxygen = 100%). ORi and SpO₂ were noninvasively and continuously measured by sensors on both the second and fourth fingers and displayed on a Masimo Radical-7^® Pulse CO-Oximeter^®. At baseline and at each induced oxygenation stage, arterial blood samples were taken for blood gas analysis and PaO₂ was measured invasively using a Siemens Rapidpoint 405 CO-Oximeter.

The researchers collected 1090 paired data points of simultaneous ORi and PaO₂ values. In the "ORi-sensitive" range of 100-200 mmHg, the mean ORi value was 0.16, with associated oxygen saturation (SpO₂) values of ≥ 97% at all points. Correlation between ORi and PaO₂ was positive at all points (p < 0.0001), with R values of 0.78, 0.83, and 0.84 for sensor 1, sensor 2, and mean of both sensors, respectively. To assess ORi's trending ability, the researchers used a 4-quadrant plot and calculated that ORi trending of PaO₂ within the range of 100-200 mmHg had a concordance rate of 94%.

The researchers concluded, “In this prospective volunteer validation study, a strong and positive correlation between PaO₂ and ORi was found, together with a good trending ability. Based on these data, the future use of ORi as a continuous noninvasive monitoring tool for assessing oxygenation status in patients receiving supplemental oxygen might be supported.” They also noted that “in healthy volunteers, ORi provides reasonable trending information of PaO₂ around the moderate hyperoxic range of PaO₂ for which its use is intended. Also, changes in PaO₂ are well reflected by changes in ORi, with good concordance. The trend in ORi can be used to track changes in PaO₂ levels in the moderate hyperoxic region, and absolute values should not be interpreted for PaO₂ levels.”

The researchers noted several limitations of the study, including that "additional studies are required to confirm these findings in a clinical setting" and that the influence of factors such as patient comorbidity and clinical circumstances requires further research. In addition, the researchers observed differences between the absolute values of simultaneously measured ORi values from sensors placed at different sites on the subject, which may require further studies in order to clinically rely on absolute ORi values as a direct measure of oxygen reserve, especially in situations where accurate oxygenation assessment may be necessary.

Study co-author Professor Thomas Scheeren commented, "ORi fills a gap in the monitoring of patients receiving supplemental oxygen by noninvasively and continuously trending the course of arterial oxygen tension. It may help to better titrate oxygen therapy to avoid both hypoxia and unintended hyperoxia."

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.

@MasimoInnovates || #Masimo

Reference
1. Vos JJ, Willems CH, Van Amsterdam K, van den Berg J, Spanjersberg R, Struys MMRF, and Scheeren TW. Oxygen Reserve Index: Validation of a New Variable. Anesth Analg. 22 Aug 2018. DOI: 10.1213/ANE.0000000000003706.

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,¹ improve CCHD screening in newborns,² and, when used for continuous monitoring with Masimo Patient SafetyNet™ in post-surgical wards, reduce rapid response activations and costs.^3,4,5 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁶ and is the primary pulse oximetry at 9 of the top 10 hospitals listed in the 2018-19 U.S. News and World Report Best Hospitals Honor Roll.⁷ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at http://www.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
2. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;338.
3. Taenzer AH et al. Impact of Pulse Oximetry Surveillance on Rescue Events and Intensive Care Unit Transfers: A Before-And-After Concurrence Study. Anesthesiology. 2010; 112(2):282-287.
4. Taenzer AH et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
5. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
6. Estimate: Masimo data on file.
7. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo ORi™. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo ORi, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

New Study Investigates the Utility of Home Monitoring Using Masimo SET^® Pulse Oximetry to Screen Children with Down Syndrome for Risk of Obstructive Sleep Apnea Prior to Diagnostic Multichannel Sleep Studies

Southampton, United Kingdom – August 13, 2018 – Masimo (NASDAQ: MASI) announced today the findings of a recently published study in which researchers investigated whether home pulse oximetry monitoring might be a useful initial screening method of determining which children with down syndrome (DS) – who are at high risk of obstructive sleep apnea (OSA) – be recommended to undergo multichannel sleep studies to diagnose the condition. The home monitoring was conducted using Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry.¹

Noting that OSA "can only be reliably diagnosed using multichannel sleep studies, which are expensive, demanding for families and only available in specialist centres," Dr. Hill and colleagues at the University of Southampton and Southampton Children’s Hospital sought to determine whether home pulse oximetry monitoring could identify children at high risk of OSA, and in particular which parameters could most sensitively detect this risk, as an initial screening step. To that end, they studied 161 children with DS, aged 0.5 to 6 years, of whom 25 were separately diagnosed with OSA. The patients were monitored overnight using Masimo Radical-7^® Pulse CO-Oximeters^®, with pulse oximetry sensors placed on the great toe. Recorded measurements included: total artifact-free time analyzed, mean oxygen saturation (SpO₂), minimum SpO₂, 3% oxyhemoglobin desaturation index (ODI), delta 12s index (the absolute difference between successive 12 second interval recordings, a measure of baseline SpO₂ variability) and the number of minutes per hour that SpO₂ was below 90%.

Receiver operating curves (ROC) and area under the curve (AUC) statistics were calculated to determine which measurements, alone and in combination, best predicted OSA status. During data analysis, researchers were blinded to which children had separately received a diagnosis of OSA. The researchers found that “The greatest AUC was achieved by the delta 12s index. At a threshold of >0.555, this identified 23/25 (sensitivity 92%) OSA cases and 89/136 true negatives (specificity 65%). The same sensitivity was achieved for 3% ODI with marginally lower specificity of 63% (86/136 true negatives).” The combined model (delta 12s index, 3% ODI, mean and minimum SpO₂) detected all true positives (100% sensitivity) but with lower specificity (53%). This result would lead 60% of the sample population (12 true positives and 18 false negatives) to confirmatory multichannel studies.

The researchers concluded that "Universal screening for OSA in children with DS using simple pulse oximetry parameters could halve the number of children requiring specialist multichannel studies. Pulse oximetry is widely available, well tolerated, readily acquired in the home and its adoption could reduce the burden on health services and families alike."

The researchers noted that "Our findings specifically apply to parameters generated by Masimo oximeters and cannot be generalised to other devices. Masimo technology extracts motion artefact, this is important in children with DS who are restless sleepers." They also noted that "the use of a retrospective clinical dataset, with anonymous data shared for this analysis, limits our information on the wider sampling frame, demographic and clinical characteristics of these children."

Masimo pulse oximetry is not cleared in the United States to screen children with Down syndrome for risk of obstructive sleep apnea.

@MasimoInnovates || #Masimo

Reference
1. Hill C, Elphick H, Farquhar M, Gringras P, Pickering R, Kingshott R, Martin J, Reynolds J, Joyce A, Gavlak J, and Evans H. Home oximetry to screen for obstructive sleep apnoea in Down syndrome. Arch Dis Child. doi:10.1136/archdischild-2017-314409.

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,¹ improve CCHD screening in newborns,² and, when used for continuous monitoring with Masimo Patient SafetyNet™ in post-surgical wards, reduce rapid response activations and costs.^3,4,5 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁶ and is the primary pulse oximetry at 17 of the top 20 hospitals listed in the 2017-18 U.S. News and World Report Best Hospitals Honor Roll.⁷ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at http://www.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
2. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;338.
3. Taenzer AH et al. Impact of Pulse Oximetry Surveillance on Rescue Events and Intensive Care Unit Transfers: A Before-And-After Concurrence Study. Anesthesiology. 2010; 112(2):282-287.
4. Taenzer AH et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
5. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
6. Estimate: Masimo data on file.
7. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo SET^® and Radical-7^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo SET^® and Radical-7, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

H Michael Cohen Joins Masimo’s Board of Directors

IRVINE, Calif – August 02, 2018 – Masimo(NASDAQ: MASI), a global medical technology developer and manufacturer of innovative noninvasive patient monitoring technologies, announced today that H Michael Cohen, former Vice Chairman of Healthcare Investment Banking at Deutsche Bank Securities, has been elected to Masimo’s Board of Directors.

Mr. Cohen has almost 30 years of experience in the healthcare industry. Over the past 19 years, he has held various roles at Deutsche Bank, including Global Head, Healthcare Investment Banking and most recently Vice Chairman, Healthcare Investment Banking. Prior to joining Deutsche Bank, Mr. Cohen worked at SG Cowen, Union Bank of Switzerland, and Booz Allen Hamilton. Mr. Cohen began his career in healthcare at Hambrecht & Quist, where he was a member of the equity research team covering biotechnology, medical device, and diagnostic companies. He received his B.A. in Economics from the University of Vermont and his M.B.A. from Columbia University.

Joe Kiani, Founder, Chairman and CEO of Masimo, said, “We’re thrilled to welcome Michael to our Board of Directors. With his vast experience in healthcare investment banking and deep understanding of the medical technology industry and the complexities of global healthcare, he’ll be an excellent addition. We look forward to benefiting from his expertise and insight as Masimo continues to grow.”

“I’m honored to join Masimo’s Board,” said Mr. Cohen. “It’s been a privilege to observe Masimo grow from its humble beginning in 1989 into the global leader in noninvasive monitoring it has become today, and I’m excited to help shape the next stage of its journey while driving long-term value for Masimo and its shareholders.”

@MasimoInnovates || #Masimo

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,¹ improve CCHD screening in newborns,² and, when used for continuous monitoring with Masimo Patient SafetyNet™ in post-surgical wards, reduce rapid response activations and costs.^3-5 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁶ and is the primary pulse oximetry at 9 of the top 10 hospitals listed in the 2018-19 U.S. News and World Report Best Hospitals Honor Roll.⁷ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at http://www.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO2 Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
2. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;Jan 8;338.
3. Taenzer AH et al. Impact of pulse oximetry surveillance on rescue events and intensive care unit transfers: a before-and-after concurrence study. Anesthesiology. 2010:112(2):282-287.
4. Taenzer A et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
5. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
6. Estimate: Masimo data on file.
7. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Eli Kammerman
Phone: (949) 297-7077
Email: ekammerman@masimo.com


Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

Masimo Reports Second Quarter 2018 Financial Results And Announces Board Authorization Of A New Stock Repurchase Program

New Study Investigates Impact of General Ward Clinical Monitoring Using Masimo Root^®, Radius-7^®, and Patient SafetyNet™ on Clinical Workflow and Patient Care

Lebanon, New Hampshire – July 26, 2018 – Masimo (NASDAQ: MASI) announced today the findings of a recently published study in which researchers at Dartmouth-Hitchcock Medical Center investigated the impact of an integrated clinical monitoring system, using various Masimo technologies and devices, on clinical workflow and patient care in the general ward. The researchers sought to "demonstrate the application of systems-level design and analysis to measure the impact of clinical monitoring on key workflow and system characteristics that contribute to early detection of patient deterioration."¹

Masimo Radius-7®

To evaluate workflow impact through use of the enhanced monitoring system, Dr. McGrath and colleagues collected data in a study unit consisting of 2 general wards with 71 beds total for five months prior to and five months after implementation. They also collected the same data for the full ten months in a control unit consisting of 2 general wards with 61 beds total, which did not have any system changes. In both the study and control units, prior to implementation, the baseline monitoring system consisted primarily of Masimo Rad-87^® Pulse CO-Oximeters^®, for continuous and spot-check (vital signs) measurements using Masimo SET^® pulse oximetry, and Masimo Patient SafetyNet™, a supplemental remote monitoring and clinician notification system, used for data processing and archiving.

The enhanced monitoring system, implemented in the study unit, added Masimo Root^® with Radius-7^® wearable Pulse CO-Oximeters. Root is a patient monitoring and connectivity platform that includes such features as built-in blood pressure and temperature measurements, a barcode reader and integration with the hospital’s admission-discharge-transfer (ADT) system, and integration with Patient SafetyNet and the hospital’s electronic medical record (EMR) system for automated capture of patient monitoring and vital signs data, including from connected third-party devices. Radius-7 is a tetherless, wearable monitor that allows patients to be mobile while still being continuously monitored, with data sent wirelessly via Bluetooth^® or WiFi to Root, eliminating the need for nurses to manually place bedside monitors in standby mode and disconnect sensors each time a patient leaves the bed.

Key points of comparison and results included:

• Monitoring system utilization: The researchers noted a significant increase in the number of hours patients were continuously monitored after implementation. Monitored hours per patient day increased from mean 17.26 hours to 19.57 hours (p < 0.0001) and monitored hours per month from mean 15,931.25 hours to 19,053.3 hours (p < 0.0001).
• Vital signs documentation: With the implementation of Root and its ability to automatically upload patient data, including pulse oximetry and blood pressure and temperature measurements, to Patient SafetyNet and the EMR, researchers noted a significant decrease in the time required to obtain and record vital signs: mean assessment time dropped from 178.8 seconds to 128.9 seconds (p < 0.0001), representing an average time savings of 3 hours per day in a 36-bed unit.
• Patient information: The researchers measured the rate at which certain patient data fields were filled out in the EMR for one month before and after implementation. Patient last name presence increased from 98.92% to 100% presence (p = 0.0083). Patient first name and room and bed presence increased from 33.75% and 57.27%, respectively, to 100% (p < 0.0001).
• Clinical staff satisfaction: Three months after implementation, hospital staff feedback was solicited in a 16-question survey which had a 65% response rate and overall "very high" satisfaction with the enhanced monitoring system.
• Alarms: The researchers found that there was a significant increase in the number of clinical alarms per patient day (rate ratio 1.46, p = 0.0263) but not per monitored hour (rate ratio 1.34, p = 0.1090), which they believe is "logical when considering [the] additional time each patient [was] monitored."

The researchers concluded, "The enhanced monitoring system received high staff satisfaction ratings and significantly improved key clinical elements related to early recognition of changes in patient state, including reducing average vital signs data collection time by 28%, increasing patient monitoring time (rate ratio 1.22), and availability and accuracy of patient information. Impact on clinical alarms was mixed, with no significant increase in clinical alarms per monitored hour."

In previous studies conducted at Dartmouth-Hitchcock, researchers found that continuous monitoring of adult post-surgical patients using Masimo SET^®, in conjunction with Masimo Patient SafetyNet, resulted in a 65% reduction in rapid response team activations and a 48% reduction in transfers back to the ICU.² Over five years, they achieved their goal of zero preventable deaths or brain damage due to opioids,³ and over ten years, they maintained a 50% reduction in unplanned transfers and a 60% reduction in rescue events, despite increase in patient acuity and occupancy.⁴

Joe Kiani, Founder and CEO of Masimo, said, "We are incredibly grateful to Dartmouth-Hitchcock for their continued long-term research into the utility of continuous patient monitoring on the general floor and the benefits that holistic, integrated monitoring systems can provide. Continuous monitoring of all patients on opioids is clearly the path forward, with the potential to make significant improvements in patient safety and quality of care. We look forward to continuing to learn from Dartmouth-Hitchcock’s data and to improving our technologies and integrated solutions."

@MasimoInnovates || #Masimo

The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. McGrath S, Perreard I, Garland M, Converse K, and Mackenzie T. Improving patient safety and clinician workflow in the general care setting with enhanced surveillance monitoring. J Biomed Health Infor. DOI 10.1109/JBHI.2018.2834863.
2. Taenzer A et al. Impact of Pulse Oximetry Surveillance on Rescue Events and Intensive Care Unit Transfers: A Before-And-After Concurrence Study. Anesthesiology. 2010; 112(2):282-287.
3. Taenzer A et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
4. McGrath S et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,¹ improve CCHD screening in newborns,² and, when used for continuous monitoring with Masimo Patient SafetyNet™ in post-surgical wards, reduce rapid response activations and costs.^3,4,5 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁶ and is the primary pulse oximetry at 17 of the top 20 hospitals listed in the 2017-18 U.S. News and World Report Best Hospitals Honor Roll.⁷ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at http://www.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
2. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;338.
3. Taenzer AH et al. Impact of Pulse Oximetry Surveillance on Rescue Events and Intensive Care Unit Transfers: A Before-And-After Concurrence Study. Anesthesiology. 2010; 112(2):282-287.
4. Taenzer AH et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
5. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
6. Estimate: Masimo data on file.
7. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo SET^®, Root^®, Radius-7^®, and Patient SafetyNet™. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo SET^®, Root, Radius-7, and Patient SafetyNet, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

New Study Investigates the Utility of Masimo PVi^® as Part of Goal-Directed Fluid Management in Patients Undergoing Colorectal Surgery

IIzmit, Turkey – July 16, 2018 – Masimo (NASDAQ: MASI) announced today the findings of a recently published study in which researchers at Kocaeli University in Turkey compared the performance of conventional fluid management (CFM) to goal-directed fluid management (GDFM) using Masimo PVi^® (pleth variability index, measured noninvasively and continuously using SET^® pulse oximetry sensors) in patients undergoing elective colorectal surgery. The primary points of comparison were the amount of crystalloids administered and blood lactate and serum creatinine levels during the intraoperative period.¹

Masimo Radical-7® with PVi®, SpHb®, and RD rainbow SET™ Sensor (Photo: Business Wire)

In the study, Dr. Cesur and colleagues, noting the importance of intraoperative fluid management in terms of postoperative organ perfusion and complications, sought to compare the effects of CFM (guided by clinical assessment and heart rate, arterial blood pressure, and invasively measured central venous pressure) with GDFM (guided by clinical assessment and noninvasive Masimo PVi monitoring). They enrolled 70 ASA I-II adult patients undergoing elective colorectal tumor surgery, who were divided randomly into CFM and GDFM groups. PVi was measured using a Masimo Radical-7^® Pulse CO-Oximeter^® with software version 7.0.3.3 and SET^® sensors. In the CFM group, an NaCl solution was administered at the rate of 4-8 ml/kg/h; when mean arterial pressure (MAP) fell below 65 mmHg or 30% baseline MAP, the speed of infusion was increased, colloid was initiated, and ephedrine was administered. In the GDFM group, the same solution was administered at the rate of 2 ml/kg/h; if PVi rose above 13% for more than 5 minutes, colloid and then ephedrine were administered. Treatments in both groups were continued until values were restored to each protocol’s pre-treatment threshold.

The researchers found that intraoperative crystalloid administration, urine output, and end-surgery fluid balance were significantly lower in the GDFM (PVi) group:

Durations of anesthesia and of surgery, as well as the amounts of intraoperative bleeding and administered colloid, were similar. The length of hospital stay was also found to be similar between the two groups.

The researchers noted that a limitation of the study was that they chose the number of subjects based on the needs of their primary objective, the comparison of intraoperative fluid volume between the two protocols, so they may not have evaluated enough subjects to effectively compare secondary outcomes such as length of stay: “We determined the primary goal of this study as the amount of intraoperative fluid volume and established 35 patients were needed for each group; if postoperative complications, the length of hospital stay[, were] determined as the primary goal, perhaps our numbers [in] each group [w]ould be different.”

@MasimoInnovates || #Masimo

References
1. Cesur S, Cardakozu T, Alparslan K, Turkyilmaz N, and Yavuz O. Comparison of conventional fluid management with PVI-based goal-directed fluid management in elective colorectal surgery. J Clin Mon. 14 June 2018. https://doi.org/10.1007/s10877-018-0163-y

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,¹ improve CCHD screening in newborns,² and, when used for continuous monitoring with Masimo Patient SafetyNet™* in post-surgical wards, reduce rapid response activations and costs.^3,4,5 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁶ and is the primary pulse oximetry at 17 of the top 20 hospitals listed in the 2017-18 U.S. News and World Report Best Hospitals Honor Roll.⁷ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at http://www.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
*The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
2. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;338.
3. Taenzer AH et al. Impact of Pulse Oximetry Surveillance on Rescue Events and Intensive Care Unit Transfers: A Before-And-After Concurrence Study. Anesthesiology. 2010; 112(2):282-287.
4. Taenzer AH et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
5. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
6. Estimate: Masimo data on file.
7. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo Root^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo Root, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

Masimo Announces Vital Signs Check Application for the Root^® Patient Monitoring and Connectivity Platform

Irvine, California – July 9, 2018 – Masimo (NASDAQ: MASI) announced today the worldwide release of the Vital Signs Check Application, an integrated patient data collection and workflow application for the Masimo Root^® patient monitoring and connectivity platform. Vital Signs Check, available for new and existing Root customers through a software upgrade, augments Root's versatility by helping to automate hospital vital signs testing workflows.

Root is a powerful, expandable platform that integrates an array of technologies, devices, and systems to provide multimodal monitoring and connectivity solutions – in a single, clinician-centric hub. Root's plug-and-play expansion capabilities allow clinicians to simplify patient monitoring by bringing together advanced rainbow SET™ Pulse CO-Oximetry, brain function monitoring, regional oximetry, capnography, and vital signs measurements on an easy-to-interpret, customizable display, empowering clinicians with important information for making patient assessments.

Root Vital Signs Check allows clinicians to streamline vital signs measurement workflows and optimize patient data management through:

• • Automated patient association, with the ability to quickly associate clinicians with their measurement sessions and patients with their data using barcode scanning or a drop-down menu that pulls data from a hospital's HL7 Admit Discharge Transfer (ADT) system.
• • Centralized data collection using a single device. Root, with the use of its optional roll stand, serves as a convenient, mobile data collection point for a variety of integrated measurements, including oxygen saturation (SpO₂), pulse rate, respiration rate, noninvasive hemoglobin (SpHb^®), and noninvasive blood pressure and temperature (including, in the U.S., non-contact thermometry via the newly announced TIR-1™). Clinicians can also enter up to 30 additional measurements for immediate documentation and validation at the patient's bedside, configured for each care area’s protocols.
• • Early Warning Scores. Configurable early warning scores (EWS) can be calculated using up to 14 Root-measured and manually-entered contributors, as determined by hospital protocol.
• • Immediate electronic charting at the bedside, with the ability to send complete, comprehensive data to the hospital electronic medical record (EMR) with the touch of a button. If a network connection is interrupted or only available at an access point, Root can store up to 1,000 sessions and automatically push all data to the EMR once network access becomes available, saving time and minimizing the need for manual documentation. Local storage, coupled with unique patient identifiers, also allows clinicians to trend and review progress over time from the bedside, which may help to identify patterns of deterioration.

Joe Kiani, Founder and CEO of Masimo, said, "From the operating room to the emergency room, from the ICU to the med-surg unit, Root is streamlining care, simplifying access to critical data, and improving hospital workflows, all so that clinicians can stay focused on their patients. With the Vital Signs Check app, Root’s utility is further enhanced, taking an important aspect of hospital care – the repetitive, data-and-labor-intensive measurement of patient vitals – that can benefit greatly from automation and bringing it in line with the best that modern technology offers."

@MasimoInnovates || #Masimo

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,¹ improve CCHD screening in newborns,² and, when used for continuous monitoring with Masimo Patient SafetyNet™* in post-surgical wards, reduce rapid response activations and costs.^3,4,5 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁶ and is the primary pulse oximetry at 17 of the top 20 hospitals listed in the 2017-18 U.S. News and World Report Best Hospitals Honor Roll.⁷ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at http://www.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
*The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
2. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;338.
3. Taenzer AH et al. Impact of Pulse Oximetry Surveillance on Rescue Events and Intensive Care Unit Transfers: A Before-And-After Concurrence Study. Anesthesiology. 2010; 112(2):282-287.
4. Taenzer AH et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
5. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
6. Estimate: Masimo data on file.
7. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo Root^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo Root, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

New Study Investigates the Utility of Masimo ORi™ (Oxygen Reserve Index) in Providing Early Detection of Blood Oxygenation Decrease During One-Lung Ventilation

Morioka, Japan – July 2, 2018 – Masimo (NASDAQ: MASI) announced today the findings of a study in which researchers evaluated the ability of Masimo ORi™ (Oxygen Reserve Index) to detect declining blood oxygenation prior to standard oxygen saturation (SpO₂) monitoring in patients undergoing elective thoracic surgery requiring one-lung ventilation (OLV).¹

ORi is a noninvasive, relative indicator of a patient's oxygen reserve in the moderate hyperoxic region (partial pressure of oxygen in arterial blood [PaO₂] in the range of 100 to 200 mmHg). As an "index" parameter with a unit-less scale between 0 and 1, ORi can be trended and has optional alarms to notify clinicians of changes in a patient’s oxygen reserve.

In the study, Dr. Koishi and colleagues at Iwate Medical University in Morioka, Japan sought to evaluate whether ORi could serve as an early warning of desaturation in patients undergoing OLV, as such patients are often prone to hypoxemia. To this end, they assessed whether ORi decreased earlier than SpO₂ during OLV, and evaluated how well ORi correlated with an invasive PaO₂ measurement. ORi and SpO₂ were measured every 2 seconds using a Masimo Root^® with Radical-7^® Pulse CO-Oximeter^® and rainbow^® sensors (revision L). The anesthesiologist was blinded to the ORi values. For data analysis, the researchers defined the start of the decrease in ORi as when its value fell below 0.05 less than its highest value after OLV began, and the start of the decrease in SpO₂ as when it was 1% less than the maximum SpO₂ value. PaO₂ was calculated as part of blood gas analysis and performed every 3 minutes during OLV, resulting in 101 pairs of measurements.

The researchers found that from the start of OLV, ORi started decreasing significantly sooner than SpO₂, a mean of 171 seconds vs. a mean of 372 seconds, p<0.01 (standard deviation of 102 and 231 seconds, respectively). They also found "a significant, strong correlation" between ORi and PaO₂: r²=0.671, p<0.01.

The researchers concluded, "ORi decreased significantly earlier than SpO₂ during OLV, suggesting that monitoring ORi might allow earlier detection of a deterioration of blood oxygenation than monitoring SpO₂ alone, contributing to a reduction in the patient’s risk of exposure to complications from OLV. However, further studies in different clinical and experimental settings are needed to evaluate the superiority of the ORi over SpO₂."

ORi has not received FDA 510(k) clearance and is not yet available for sale in the United States.

@MasimoInnovates || #Masimo

Reference
1. Koishi W, Kumagai M, Ogawa S, Hongo S, and Suzuki K. Monitoring the Oxygen Reserve Index can contribute to the early detection of deterioration in blood oxygenation during one-lung ventilation. Minerva Anestesiologica. 14 May 2018. DOI: 10.23736/S0375-9393.18.12622-8.

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,¹ improve CCHD screening in newborns,² and, when used for continuous monitoring with Masimo Patient SafetyNet™* in post-surgical wards, reduce rapid response activations and costs.^3,4,5 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁶ and is the primary pulse oximetry at 17 of the top 20 hospitals listed in the 2017-18 U.S. News and World Report Best Hospitals Honor Roll.⁷ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at http://www.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
*The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
2. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;338.
3. Taenzer AH et al. Impact of Pulse Oximetry Surveillance on Rescue Events and Intensive Care Unit Transfers: A Before-And-After Concurrence Study. Anesthesiology. 2010; 112(2):282-287.
4. Taenzer AH et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
5. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
6. Estimate: Masimo data on file.
7. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo ORi™. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo ORi, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

United Arab Emirates Ministry of Health & Prevention Adopts National CCHD Newborn Screening Program Using Masimo Rad-97™ Pulse CO-Oximeters^® with Eve™

Dubai, United Arab Emirates – June 26, 2018 – Masimo (NASDAQ: MASI) announced today that the United Arab Emirates (UAE) Ministry of Health & Prevention (MOHAP) is adopting a national screening protocol for critical congenital heart disease (CCHD) for all newborns. As part of the program launch, the MOHAP is equipping 9 hospitals across 5 emirates, serving 50% of the UAE population, with Masimo Rad-97™ Pulse CO-Oximeters^® with Eve™ CCHD Newborn Screening Application. Newborns delivered at these hospitals will now be screened for CCHD using Eve – the first large-scale installation of Eve on Rad-97, which received CE marking earlier this year.

CCHD affects approximately 2.5 to 3 newborns per 1000 live births¹ and requires intervention soon after birth to prevent significant morbidity or mortality; later detection in infants also increases the risk of brain damage.² In a study of 39,821 infants, CCHD screening sensitivity increased from 63% with physical exam alone to 83% with physical exam and Masimo SET^® pulse oximetry.³ In a study of 122,738 infants – the largest CCHD screening study to date – CCHD screening sensitivity increased from 77% to 93% with the combined use of Masimo SET^® and clinical assessment.⁴

Eve, also available on the Radical-7^® Pulse CO-Oximeter, combines the power of Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry with an automated pre- to post-ductal synchronization algorithm designed to reduce calculation errors. In addition, Eve simplifies the CCHD screening process by providing visual instructions, animations, and a detailed, easy-to-interpret display of screening results. The ability to label results with unique patient identifiers for both mother and newborn facilitates intuitive session management and seamless electronic charting. Eve also allows clinicians to incorporate perfusion index into screening, which has been shown to increase sensitivity to the detection of CCHD in infants with pathologically low perfusion.⁵

Masimo worked closely with the UAE to implement the MOHAP program, including onsite training for doctors, nurses, and midwives at each hospital. H.E. Dr. Yousif Al Serkal, Assistant Undersecretary for the Hospitals Sector, emphasized the Ministry’s strategy of "providing comprehensive and innovative health services in accordance with the highest standards of excellence, professionalism, and leadership in the health sector. The goal of the 'Newborn Critical Congenital Heart Screening Program' is to ensure that all UAE newborns are screened, and all affected infants receive appropriate confirmatory testing, counseling, and treatment to prevent complications and reduce mortality." He noted that the program has a comprehensive database and e-system for the registration of all screening test results, as well as helping to control quality and track performance through periodic reporting. Dr. Kalthoom Al Balooshi, Director of the Hospitals Department, explained that "the screening initiative will be implemented in nine main hospitals, which includes screening with pulse oximetry, a CCHD screening database, integrated EMR solutions, and awareness programs for physicians, nurses, and parents."

Jon Coleman, President of Worldwide Sales, Professional Services, and Medical Affairs for Masimo, said, "We are honored that the UAE chose Masimo to help implement this vital newborn screening process for their citizens. Masimo SET^® performance and accuracy have helped to usher in reliable and cost-effective CCHD screening, as shown in the multiple studies concluding that SET^® pulse oximetry, combined with clinical assessment, significantly improved CCHD screening sensitivity. We believe that Masimo SET^® pulse oximetry and the Eve CCHD Screening App make for a compelling combination, and hope that more institutions and governments around the world will recognize the importance of helping their youngest patients get a great start in life."

Rad-97 offers Masimo noninvasive and continuous monitoring, through Measure-through Motion and Low Perfusion SET^® pulse oximetry and upgradeable rainbow^® technology, in a compact, standalone monitor that incorporates advanced customizability, connectivity, and device integration capabilities. In addition to Eve, Rad-97 is also available in configurations with integrated noninvasive blood pressure measurement and integrated NomoLine™ capnography.

@MasimoInnovates || #Masimo

References
1. Hoffman JL et al. The incidence of congenital heart disease. J Am Coll Cardiol. 2002;39(12):1890-1900.
2. 2011 Legislative Report; State of Maryland, Department of Health and Mental Hygiene, State Advisory Council on Hereditary and Congenital Disorders. Recommendations on Implementation of Screening for Critical Congenital Heart Disease in Newborns. Page 7.
3. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;Jan 8;338.
4. Zhao et al. Pulse oximetry with clinical assessment to screen for congenital heart disease in neonates in China: a prospective study. Lancet. 2014 Aug 30;384(9945):747-54.
5. de-Wahl Ganelli et al. Noninvasive Peripheral Perfusion Index as a Possible Tool for Screening for Critical Left Heart Obstruction. Acta Paediatr. 2007 Oct;96(10):1455-1459.

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,¹ improve CCHD screening in newborns,² and, when used for continuous monitoring with Masimo Patient SafetyNet™* in post-surgical wards, reduce rapid response activations and costs.^3,4,5 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁶ and is the primary pulse oximetry at 17 of the top 20 hospitals listed in the 2017-18 U.S. News and World Report Best Hospitals Honor Roll.⁷ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at http://www.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
*The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
2. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;338.
3. Taenzer AH et al. Impact of Pulse Oximetry Surveillance on Rescue Events and Intensive Care Unit Transfers: A Before-And-After Concurrence Study. Anesthesiology. 2010; 112(2):282-287.
4. Taenzer AH et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
5. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
6. Estimate: Masimo data on file.
7. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo Masimo Rad-97™, Eve™, and Radical-7^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo Rad-97, Eve, and Radical-7, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

Masimo and PositiveID Announce the U.S. Release of TIR-1™

Irvine, California and Delray Beach, Florida – June 18, 2018 - Masimo (NASDAQ: MASI) and Thermomedics, a PositiveID (OTCQB: PSID) company, announced today the debut and U.S. market release of TIR-1™, a non-contact Bluetooth^®-enabled thermometer that integrates seamlessly with the Masimo Root^® patient monitoring and connectivity platform.

TIR-1 is an easy-to-use, clinical-grade infrared thermometer that provides forehead temperature measurements across all patient populations. As a non-contact device, the thermometer reduces the possibility of cross-contamination and eliminates the need to purchase additional disposables such as probe covers, reducing cost and waste. Its simple, one-button operation delivers patient temperature results in seconds, reducing the time needed to take temperature measurements compared to traditional methods. Bluetooth connectivity, available exclusively in the customized thermometer developed by Thermomedics for Masimo, enables wireless data transfer to a connected Root monitor, automating efficient integration of an important patient vital sign into bedside devices, including early warning scores, and from there to hospital EMRs via Masimo Patient SafetyNet™* or Iris Gateway™.

Masimo Root is a powerful, expandable patient monitoring and connectivity hub that integrates an array of technologies, devices, and systems to provide multimodal monitoring and connectivity solutions – in a single, clinician-centric platform. Root’s plug-and-play expansion capabilities allow clinicians to centralize patient monitoring by bringing together advanced rainbow SET™ Pulse CO-Oximetry, brain function monitoring, regional oximetry, capnography, and vital signs measurements – now including non-contact thermometry – on an easy-to-interpret, customizable display, empowering clinicians with more information for making patient assessments.

Joe Kiani, Founder and CEO of Masimo, said, "TIR-1 is a great example of the powerful expandability and versatility of the Root platform, and of our commitment to improving patient care through streamlined and automated workflows. This thermometer makes it easy to efficiently take the temperatures of multiple patients without having to manually record data. We’re delighted to have partnered with Thermomedics to develop an additional, easy-to-use thermometry option for Root customers."

William J. Caragol, Chairman and CEO of PositiveID, said, "Our team worked diligently to develop the TIR-1, the first Bluetooth-wireless non-contact thermometer to be paired with a vital signs monitoring system. We are very proud to bring this product to market with a world-class company like Masimo and introduce non-contact thermometry to the Root platform."

@MasimoInnovates || #Masimo

*The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

About Thermomedics/PositiveID
About Thermomedics/PositiveID Thermomedics, Inc. designs, develops and markets medical diagnostic equipment for professional healthcare providers. Our products are specifically designed for use in a wide range of medical settings, delivering nearly instantaneous diagnostic information. Our goal was simple from the start. We wanted to build the best equipment and bring the most cutting edge technology to frontline medical professionals. Thermomedics, Inc. is a wholly owned subsidiary of PositiveID Corporation™ (OTCQB: PSID), a life sciences tools and diagnostics company. PositiveID specializes in the development of microfluidic systems in order to detect biological threats and outbreaks, whether airborne, in a healthcare setting, or at the point of need through its ExcitePCR subsidiary. For more information on PositiveID, please visit www.psidcorp.com, or connect with PositiveID on Twitter, Facebook or LinkedIn.

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,¹ improve CCHD screening in newborns,² and, when used for continuous monitoring with Masimo Patient SafetyNet™* in post-surgical wards, reduce rapid response activations and costs.^3,4,5 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁶ and is the primary pulse oximetry at 17 of the top 20 hospitals listed in the 2017-18 U.S. News and World Report Best Hospitals Honor Roll.⁷ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at www.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
*The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
2. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;338.
3. Taenzer AH et al. Impact of Pulse Oximetry Surveillance on Rescue Events and Intensive Care Unit Transfers: A Before-And-After Concurrence Study. Anesthesiology. 2010; 112(2):282-287.
4. Taenzer AH et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
5. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
6. Estimate: Masimo data on file.
7. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo MightySat™ and SET^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo MightySat and SET^®, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Allison Tomek
Thermomedics/PositiveID
Phone: (561) 805-8044
Email: atomek@psidcorp.com

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

New Study Investigates the Utility of Masimo SedLine^® Patient State Index in Monitoring Anesthesia Depth of Patients with Healthy and Cirrhotic Livers

Copenhagen, Denmark – June 11, 2018 – Masimo (NASDAQ: MASI) announced today the findings of an abstract presented at Euroanaesthesia 2018 in which researchers compared Masimo Patient State Index (PSi), a processed EEG parameter provided by SedLine^® brain function monitoring (in this study, first generation SedLine), to Medtronic Bispectral Index (BIS™) in monitoring the depth of anesthesia of two groups of patients: healthy volunteers undergoing hepatotomy for liver donation and cirrhotic patients undergoing liver resection. The researchers found "excellent" agreement between the two methods as well as similar sevoflurane consumption, and found that PSi 1.0 was less affected by electrocautery.¹

In the study, Dr. Yassen and colleagues at Menoufia University in Shibin El Kom, Egypt sought to test agreement between two brain function monitoring indices, Masimo PSi and Medtronic BIS. They monitored 60 patients in 4 sub-groups: with healthy livers undergoing hepatotomy (15 PSi, 15 BIS) and with cirrhotic livers undergoing resection (15 PSi, 15 BIS). Sensors for both technologies were simultaneously applied and anesthetists monitoring PSi were blinded to BIS results and vice versa. To measure the level of interference from electrocautery on each index, the researchers noted whether BIS and PSi values were present (displayed) or absent each time the electrocautery unit was activated.

The researchers found "An excellent degree of reliability between PSi and BIS at all measuring points." With 804 data pairs total, they calculated an overall intra-class correlation of 0.92 (95% confidence interval of 0.91-0.93, p<0.001). Using Bland-Altman analysis, they calculated overall mean bias difference of 2.19 (95% confidence interval of 1.40-2.98, p<0.0001). PSi-guided and BIS-guided sevoflurane consumption were similar: 65.67ml±31.60ml and 68.47ml±27.63ml respectively, p=0.983.

The researchers found the following rates of incidence of electrocautery interference:

The researchers concluded, "Agreement between PSi and BIS during surgery is excellent among patients with healthy or cirrhotic livers. Both can be used to monitor trends of anaesthesia depth changes and equally consumed similar sevoflurane volumes. However PSi allowed for continuous monitoring without interruptions from electrocautery."

SedLine brain function monitoring helps clinicians monitor the state of the brain under anesthesia with bilateral acquisition and processing of four leads of electroencephalogram (EEG) signals. Next Generation SedLine, now available worldwide, features an enhanced PSi with less susceptibility to EMG interference and improved performance in low power EEG cases, as well as an enhanced Multitaper Density Spectral Array (DSA).

@MasimoInnovates || #Masimo

Reference
1. Yassen K, Elsheikh M, Helal S, Badawy E, and Metwally A. Patient State Index versus Bispectral Index in cirrhotic patients and non-cirrhotics undergoing hepatic resection: A controlled randomized study. Proceedings from Euroanaesthesia 2018, Copenhagen, Denmark. #1167.

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,¹ improve CCHD screening in newborns,² and, when used for continuous monitoring with Masimo Patient SafetyNet™* in post-surgical wards, reduce rapid response activations and costs.^3,4,5 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁶ and is the primary pulse oximetry at 17 of the top 20 hospitals listed in the 2017-18 U.S. News and World Report Best Hospitals Honor Roll.⁷ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at http://www.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
*The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
2. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;338.
3. Taenzer AH et al. Impact of Pulse Oximetry Surveillance on Rescue Events and Intensive Care Unit Transfers: A Before-And-After Concurrence Study. Anesthesiology. 2010; 112(2):282-287.
4. Taenzer AH et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
5. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
6. Estimate: Masimo data on file.
7. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo SedLine^® and PSi. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo SedLine and PSi, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

New Study Investigates the Utility of Masimo SpHb^® in Post-operative Red Blood Cell (RBC) Transfusion Best Practices

Lisbon, Portugal – April 19, 2018 – Masimo (NASDAQ: MASI) announced today the findings of an abstract presented at the 2018 Annual Meeting of the Network for the Advancement of Patient Blood Management, Haemostatis and Thrombosis (NATA), in which researchers investigated the utility of Masimo noninvasive and continuous hemoglobin (SpHb^®) in supporting and enhancing red blood cell (RBC) transfusion best practices as part of post-operative patient blood management (PBM).¹

In the study, Prof. Baricchi and colleagues in the Transfusion Medicine Unit, AUSL-IRCCS of Reggio Emilia and at the Department of Medicine and Surgery at the University of Parma, Italy, sought to evaluate the appropriateness of post-operative RBC transfusion over a three-year period (2013-2015), before and after implementation of a patient blood management (PBM) program. The PBM policy consisted of three months of training followed by the introduction of noninvasive, continuous point-of-care (POC) monitoring of patient hemoglobin using Masimo SpHb on Masimo Radical-7^® Pulse CO-Oximeters^®. An initial audit of RBC transfusion appropriateness was conducted prior to the introduction of the PBM policy, on 168 patients. A final audit, after the policy was in place, was conducted on 205 patients. To determine transfusion appropriateness, investigators used the guidelines established by the Italian Society of Transfusion Medicine and Immunohaematology (SIMTI).

The researchers found that prior to the introduction of the PBM policy, 37.7% of RBC transfusions were appropriate. After the introduction of the PBM policy, including use of noninvasive and continuous hemoglobin monitoring with Masimo SpHb, they found 65.4% of RBC transfusions were appropriate, a significant increase in transfusion appropriateness.

The researchers concluded that, "In our experience, the PBM strategies introduced improved RBC transfusion appropriateness in the post-operative period. We believe that our PBM policy and introduction of POC testing are a valuable support for the healthcare workers in the transfusion decision-making process. This enhancement of transfusion appropriateness implies clinical and managerial advantages, such as reduced transfusion-related risks, optimization of the health care resources and reduction of the costs."

SpHb is not intended to replace laboratory blood testing. Clinical decisions regarding red blood cell transfusions should be based on the clinician’s judgment considering among other factors: patient condition, continuous SpHb monitoring, and laboratory diagnostic tests using blood samples.

@MasimoInnovates || #Masimo

Reference
1. Baricchi R, Marraccini C, Merolle L, Berni P, Bonini A, Mazzi A, Pertinhez T.A., and Di Bartolomeo E. Patient blood management: transfusion appropriateness in the postoperative period. Proceedings from the 2018 NATA Annual Meeting, Lisbon, Portgual. #P30.

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,¹ improve CCHD screening in newborns,² and, when used for continuous monitoring with Masimo Patient SafetyNet™* in post-surgical wards, reduce rapid response activations and costs.^3,4,5 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁶ and is the primary pulse oximetry at 17 of the top 20 hospitals listed in the 2017-18 U.S. News and World Report Best Hospitals Honor Roll.⁷ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at http://www2.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
*The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
2. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;338.
3. Taenzer AH et al. Impact of Pulse Oximetry Surveillance on Rescue Events and Intensive Care Unit Transfers: A Before-And-After Concurrence Study. Anesthesiology. 2010; 112(2):282-287.
4. Taenzer AH et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
5. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
6. Estimate: Masimo data on file.
7. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo SpHb^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo SpHb, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.