Masimo to Report Fourth Quarter and Full Year 2009 Financial Results After Market Close on February 16, 2010

Conference call and webcast to begin at 1:30 p.m. PT (4:30 p.m. ET)

IRVINE, Calif., February 2, 2010 -- Masimo Corporation (Nasdaq: MASI), the inventor of Pulse CO-Oximetry and Measure-Through Motion and Low-Perfusion pulse oximetry, today announced it will release fourth quarter and full year 2009 financial results for the period ended January 2, 2010 after the market closes on February 16, 2010.

A conference call to review the results will begin at 1:30 p.m. PT (4:30 p.m. ET) and will be hosted by Joe E. Kiani, Chairman and Chief Executive Officer, and Mark P. de Raad, Executive Vice President and Chief Financial Officer.

A live webcast of the conference call will be available online from the investor relations page of the company's corporate web site at www.masimo.com. The dial-in numbers are (888) 520-7182 for domestic callers and +1 (706) 679-9937 for international callers. The reservation code for both dial-in numbers is 52590350. After the live webcast, the call will be available on Masimo's website through March 16, 2010. In addition, a telephonic replay of the call will be available through March 2, 2010. The replay dial-in numbers are (800) 642-1687 for domestic callers and +1 (706) 645-9291 for international callers. Please use reservation code 52590350.

About Masimo
Masimo (NASDAQ: MASI) develops innovative monitoring technologies that significantly improve patient care—helping solve "unsolvable" problems. In 1995, the company debuted Measure-Through Motion and Low Perfusion pulse oximetry, known as Masimo SET®, which virtually eliminated false alarms and increased pulse oximetry's ability to detect life-threatening events. More than 100 independent and objective studies demonstrate Masimo SET provides the most reliable SpO2 and pulse rate measurements even under the most challenging clinical conditions, including patient motion and low peripheral perfusion. In 2005, Masimo introduced Masimo Rainbow SET® Pulse CO-Oximetry™, a breakthrough noninvasive blood constituent monitoring platform that can measure many blood constituents that previously required invasive procedures. Masimo Rainbow SET continuously and noninvasively measures total hemoglobin (SpHb™), oxygen content (SpOC™), carboxyhemoglobin (SpCO®), methemoglobin (SpMet®), PVI®, and acoustic respiration rate (RRa™), in addition to oxyhemoglobin (SpO2), pulse rate (PR), and perfusion index (PI), allowing early detection and treatment of potentially life-threatening conditions. Founded in 1989, Masimo has the mission of "Improving Patient Outcomes and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications." Additional information about Masimo and its products may be found at www.masimo.com.

Masimo Corporation
Investor Contact:
Sheree Aronson
Vice President, Investor Relations
Masimo Corporation
(949) 297-7043
saronson@masimo.com

Media Contact:
Dana Banks
Manager, Public Relations
Masimo Corporation
(949) 297-7348
dbanks@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Outcomes and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, Rainbow, SpHb, SpOC, SpCO, SpMet, PVI, Radical-7, Rad-87, Rad-57,Rad-9, Rad-8, Rad-5, Pulse CO-Oximetry and Pulse CO-Oximeter are trademarks or registered trademarks of Masimo Corporation.

St. Luke's Episcopal Hospital Becomes First in Texas to Monitor Post-surgical Patients with Masimo Patient SafetyNet™

Clinically-Proven Technology Helps St. Luke's Clinicians Improve Patient Care and Reduce Costs

Houston, Texas – January 26, 2010 – St. Luke's Episcopal Hospital (SLEH) and Masimo (NASDAQ: MASI), the inventor of Pulse CO-Oximetry™ and Measure-Through Motion and Low-Perfusion pulse oximetry, jointly announced today that the Houston-based hospital is the first in Texas to use the Masimo Patient SafetyNet™ system to continuously monitor the physiological status of post-surgical patients—ensuring early detection of patient deterioration and enabling potentially life-saving interventions. 

With the Patient SafetyNet system, St. Luke's clinicians receive a pager notification when a patient's condition is worsening, allowing them to intervene before the condition becomes critical and requires more acute levels of care. This is particularly important for post-surgical patients who are at increased risk of serious injury or death resulting from the respiratory depression effects of patient-controlled analgesia (PCA) and opioids used for sedation and pain management. 

According to John Sabo, administrative director of Respiratory Therapy at St. Luke's Episcopal Hospital, Masimo Patient SafetyNet is helping St. Luke's to realize its vision of improving both patient safety and hospital efficiencies through early detection and intervention of acute respiratory changes in its post-surgical patients. "We have already witnessed the benefits of Patient SafetyNet in our orthopedic and pulmonary units.  Patient SafetyNet will assist in the improvement of utilization of ICU resources, patient outcomes, and a reduction in overall costs."

The Patient SafetyNet system keeps post-surgical patients safer by continuously, noninvasively, and remotely monitoring multiple physiological parameters, including arterial oxygen saturation and pulse rate, and automatically alerting clinicians to changes that signal patient distress or deterioration.  In a recently published landmark study by Dartmouth Hitchcock Medical Center, the Patient SafetyNet system was shown to help reduce rescue events and activations 65% and  ICU transfers 48%.¹

"Once my alarm limits are set, I know I can rely on Patient SafetyNet to watch over my patients, continuously assessing their health status 24/7," stated Samantha Biba, BSN, RN-BC, Acute Pulmonary Unit, Quality Supervisor.  "At the first sign of trouble, the system alerts me via pager so I can attend to the patient and assess his or her condition. Not only has the system been instrumental in helping us to identify patient deterioration much earlier to prevent more serious adverse events, but its effect on patient care and safety has been invaluable." 

Combining the gold standard performance of Masimo SET® pulse oximetry with respiration rate monitoring at the point-of-care and wireless clinician notification via pager, Patient SafetyNet provides an unmatched level of safety for up to 80 patients on four floors. The system uses open IEEE industry standards for connectivity, which allows for more efficient sharing of data across a hospital's IT platforms, along with the option of full integration into a hospital's existing IT infrastructure—providing a lower overall cost of ownership and improved financial benefits.

To further advance patient safety initiatives, St. Luke's will also implement Masimo Rainbow SET Pulse CO-Oximetry technology—making noninvasive and continuous hemoglobin (SpHb™), oxygen content (SpOC™), carboxyhemoglobin (SpCO®), methemoglobin (SpMet®), and PVI® an integral component of their routine patient monitoring protocols in their emergency, surgery, and recovery care areas.

¹ Taenzer, Andreas H.; Pyke, Joshua B.; McGrath, Susan P.; Blike, George T. "Impact of Pulse Oximetry Surveillance on Rescue Events and Intensive Care Unit Transfers: A Before-and-After Concurrence Study." Anesthesiology, February 2010, Vol. 112, Issue 2.
Available online at:  http://journals.lww.com/anesthesiology/Abstract/publishahead/Impact_of_Pulse_Oximetry_Surveillance_on_Rescue.99692.aspx

About St. Luke's Episcopal Health System
St. Luke's Episcopal Health System (www.stlukestexas.com) includes St. Luke's Episcopal Hospital in the Texas Medical Center, founded in 1954 by the Episcopal Diocese of Texas; St. Luke's The Woodlands Hospital; St. Luke's Sugar Land Hospital; St. Luke's Lakeside Hospital; St. Luke's Episcopal Health Charities, a charity devoted to assessing and enhancing community health, especially among the underserved. St. Luke's Episcopal Hospital is home to the Texas Heart® Institute, which was founded in 1962 by Denton A. Cooley, MD, and is consistently ranked among the top 10 cardiology and heart surgery centers in the country by U.S.News & World Report. Affiliated with several nursing schools and three medical schools, St. Luke's Episcopal Hospital was the first hospital in Texas named a Magnet hospital for nursing excellence, and has been honored four times with the Distinguished Hospital Award for Clinical Excellence™ by HealthGrades, a leading independent company that measures healthcare quality in hospitals. The Health System has been recognized by FORTUNE as among the "100 Best Companies to Work For" and by the Houston Business Journal as a top employer in Houston. St. Luke's Episcopal Health System also was honored as one of Modern Healthcare magazine's "100 Best Places to Work."

About Masimo
Masimo (NASDAQ: MASI) develops innovative monitoring technologies that significantly improve patient care—helping solve "unsolvable" problems.  In 1995, the company debuted Measure-Through Motion and Low Perfusion pulse oximetry, known as Masimo SET®, which virtually eliminated false alarms and increased pulse oximetry's ability to detect life-threatening events.  More than 100 independent and objective studies demonstrate Masimo SET provides the most reliable SpO2 and pulse rate measurements even under the most challenging clinical conditions, including patient motion and low peripheral perfusion.  In 2005, Masimo introduced Masimo Rainbow SET® Pulse CO-Oximetry™, allowing noninvasive and continuous monitoring of blood constituents that previously required invasive procedures, including total hemoglobin (SpHb™), oxygen content (SpOC™), carboxyhemoglobin (SpCO®), methemoglobin (SpMet®), and PVI®, in addition to SpO2, pulse rate, and perfusion index (PI).  In 2009, Masimo introduced Masimo Rainbow SET® Acoustic Monitoring™, the first-ever noninvasive and continuous monitoring of acoustic respiration rate (RRa).  Masimo's Rainbow platform offers a breakthrough in patient safety by helping clinicians detect life-threatening conditions and helping guide treatment options.  Founded in 1989, Masimo has the mission of "Improving Patient Outcomes and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications." Additional information about Masimo and its products may be found at www.masimo.com.

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 belief that Masimo Patient SafetyNet will provide an effective early warning system of a patient's deteriorating physiological condition to enable timely rescue and increase patient safety, risks related to our belief that Masimo SET and Masimo Rainbow SET measurements and alarms will provide sufficient sensitivity and specificity to detect physiological abnormalities and potentially life-threatening conditions in real-time for all patients, risks related to our assumptions regarding the repeatability of clinical results, 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 forward-looking 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.

Media Contacts:
Dana Banks
Masimo Corporation
(949) 297-7348
dbanks@masimo.com

Jessica Michan
St. Luke's Episcopal Health System
(832) 355-3791
jmichan@sleh.com

Masimo, SET, Signal Extraction Technology, Improving Outcomes and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, Rainbow, SpHb, SpOC, SpCO, SpMet, PVI, RRa, Radical-7, Rad-87, Rad-57,Rad-9, Rad-8, Rad-5,Pulse CO-Oximetry and Pulse CO-Oximeter are trademarks or registered trademarks of Masimo Corporation.

Landmark Study Shows Masimo SET® Pulse Oximetry and Patient SafetyNet™ Can Help Hospitals Dramatically Decrease Rescue Events and ICU Transfers, and ICU Days

Irvine, California – January 22, 2010 – Dartmouth-Hitchcock Medical Center and Masimo (NASDAQ: MASI), the inventor of Pulse CO-Oximetry™ and Measure-Through Motion and Low Perfusion pulse oximetry, jointly announced the peer-reviewed publication of an in-depth, 21-month clinical study on the impact of the Masimo Patient SafetyNet remote monitoring and clinician notification system. The study, featured in the February 2010 issue of Anesthesiology, is the first published report to demonstrate that continuous pulse oximetry monitoring and clinician notification in post-surgical patients on the general floor leads to a "significant drop" in key clinical outcome measures, including 65% fewer rescue events, 48% fewer ICU transfers, and reduced annualized ICU time by 135 days.¹

In the study, Dr. Andreas Taenzer and a team of clinicians at Dartmouth-Hitchcock Medical Center used Masimo Patient SafetyNet—which combines the gold-standard performance of Masimo SET pulse oximetry at the point of care with remote monitoring and wireless clinician notification via pager—in a 36-bed post-surgical orthopedic unit. When comparing data collected for 11 months before and 10 months after implementation Patient SafetyNet in the 36-bed unit – as well as two other post-operative units with only standard monitoring equipment and protocols in place - researchers found that Patient SafetyNet-monitored patients experienced approximately 65% fewer rescue events (1.2 vs. 3.4 per 1,000 patient discharges) and 48% fewer ICU transfers (2.9 vs. 5.6 per 1,000 patient days)—freeing up 135 ICU days per year, while the two comparison units had no change.

"Masimo Patient SafetyNet represents a new approach to detect unrecognized post-operative deterioration—a significant precursor in morbidity and mortality for in-hospital patients," stated the lead researcher and author of the study, Andreas H. Taenzer, MD, FAAP, Assistant Professor of Anesthesiology and Pediatrics at the Dartmouth Medical School, Dartmouth-Hitchcock Medical Center, in Lebanon, New Hampshire. "Our study results strongly demonstrate that continuous patient surveillance with Masimo Patient SafetyNet can greatly improve outcomes."

In an accompanying editorial about the impact of the study, John P. Abenstein, MSEE, MD, at the Department of Medicine, Mayo Clinic, in Rochester, Minnesota, wrote that the "implications of this study are broad" and its results could "have important implications for hospital wards throughout the country."² According to Dr. Abenstein, "The literature and each of our own clinical experiences have examples of physicians on rounds, or nurses coming to check patients who have been dead for hours." He continued, "We believe that Taenzer et al. have shown us a glimpse of the future" and "Not only will such systems allow us to improve the quality of care of our patients, but will also be a key to lowering costs."

Masimo Founder and CEO, Joe Kiani, stated, "This is one of the most important studies ever published on pulse oximetry because it shows that with Masimo SET Pulse Oximetry technology, improving patient safety and reducing the cost of care can go together. There have been other studies that have shown the positive clinical and cost outcome in neonates and infants by using Masimo SET pulse oximetry, but this is the first time with adults. Over 20 years ago, we set out to solve the motion artifact and low perfusion problems of pulse oximetry, which were the bane of pulse oximetry and were thought to be unsolvable at the time. We thought by overcoming the motion artifact problem, we could improve patient outcome and reduce cost of care by taking noninvasive monitoring to new sites and applications. In fact, this became our mission statement. The clinicians at Dartmouth-Hitchcock, with their culture of patient safety, have shown a breakthrough in patient care is not only possible, but can be attained cost effectively. With this groundbreaking study, our vision is that in the near future, hospitals will utilize this important Patient SafetyNet technology to care for all of their patients, the same way airbags have become ubiquitous in cars today."

¹ Taenzer, Andreas H.; Pyke, Joshua B.; McGrath, Susan P.; Blike, George T. "Impact of Pulse Oximetry Surveillance on Rescue Events and Intensive Care Unit Transfers: A Before-and-After Concurrence Study." Anesthesiology, February 2010, Vol. 112, Issue 2.
Available online at: http://journals.lww.com/anesthesiology/Abstract/publishahead/Impact_of_Pulse_Oximetry_Surveillance_on_Rescue.99692.aspx
² Abenstein, John P.; Narr, Bradly J. "An Ounce of Prevention May Equate to a Pound of Cure: Can Early Detection and Intervention Prevent Adverse Events?" Anesthesiology, February 2010, Vol. 112, Issue 2. Available online at: http://journals.lww.com/anesthesiology/Citation/publishahead/An_Ounce_of_Prevention_May_Equate_to_a_Pound_of.99693.aspx

About Masimo
Masimo (NASDAQ: MASI) develops innovative monitoring technologies that significantly improve patient care—helping solve "unsolvable" problems. In 1995, the company debuted Measure-Through Motion and Low Perfusion pulse oximetry, known as Masimo SET®, which virtually eliminated false alarms and increased pulse oximetry's ability to detect life-threatening events. More than 100 independent and objective studies demonstrate Masimo SET provides the most reliable SpO2 and pulse rate measurements even under the most challenging clinical conditions, including patient motion and low peripheral perfusion. In 2005, Masimo introduced Masimo Rainbow SET® Pulse CO-Oximetry™, allowing noninvasive and continuous monitoring of blood constituents that previously required invasive procedures, including total hemoglobin (SpHb™), oxygen content (SpOC™), carboxyhemoglobin (SpCO®), methemoglobin (SpMet®), and PVI®, in addition to SpO2, pulse rate, and perfusion index (PI). In 2009, Masimo introduced Masimo Rainbow SET® Acoustic Monitoring™, the first-ever noninvasive and continuous monitoring of acoustic respiration rate (RRa). Masimo's Rainbow platform offers a breakthrough in patient safety by helping clinicians detect life-threatening conditions and helping guide treatment options. Founded in 1989, Masimo has the mission of "Improving Patient Outcomes and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications." Additional information about Masimo and its products may be found at www.masimo.com.

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 study results, risks related to our assumptions that Masimo Patient SafetyNet will provide an effective early warning system of a patient's deteriorating physiological condition to enable timely rescue, risks related to our belief that Masimo Rainbow SET Pulse CO-Oximetry measurements and Masimo Desat Index 3D Alarms will provide sufficient sensitivity and specificity to detect physiological abnormalities and potentially life-threatening conditions in real-time for all patients, and risks related to our assumptions regarding the systems' ability to deliver clinical improvement over alternative patient monitoring and assessment methods to increase patient safety and allow for further adoption of the technology, 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 forward-looking 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.

Contact:
Dana Banks
Masimo Corporation
949-297-7348

Masimo, SET, Signal Extraction Technology, Improving Outcomes and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, Rainbow, SpHb, SpOC, SpCO, SpMet, PVI, RRa, Radical-7, Rad-87, Rad-57,Rad-9, Rad-8, Rad-5,Pulse CO-Oximetry and Pulse CO-Oximeter are trademarks or registered trademarks of Masimo Corporation.

BMEYE Receives CE Mark to Launch First Noninvasive Cardiovascular Monitor with Masimo Rainbow SET® Pulse CO-Oximetry™ Technology in Europe

Incorporating Masimo's Breakthrough Noninvasive Hemoglobin and Oxygen Saturation Measurements, ccNexfin Debuts to European Market

Amsterdam, The Netherlands and Irvine, California – January 21, 2010 – BMEYE B.V., the innovators of combined noninvasive, beat-to-beat blood pressure and cardiac output monitoring, and Masimo (NASDAQ: MASI), the inventor of Pulse CO-Oximetry and Measure-Through Motion and Low-Perfusion pulse oximetry, jointly announce today CE Mark certification and the European launch of the BMEYE ccNexfin—the first noninvasive cardiovascular monitor with Masimo Rainbow SET Pulse CO-Oximetry technology.  The combination of two innovative noninvasive technologies—BMEYE for cardiovascular monitoring and Masimo Rainbow SET for hemoglobin and oxygen saturation monitoring—provides real-time, beat-to-beat measurements of cardiac, circulatory, and pulmonary parameters, which may enable clinicians to detect impending cardiovascular crisis before organ injury ensues. 

The ccNexfin with Masimo Rainbow SET offers some of the most advanced cardiovascular monitoring capabilities available today.  It utilizes a single sensor finger cuff (BMEYE) and finger sensor (Masimo Rainbow SET) to capture and continuously measure beat-to-beat blood pressure (sys/dia), mean arterial pressure (MAP), cardiac output (CO), stroke volume (SV), systemic vascular resistance (SVR), derivative of pressure (dP/dt), noninvasive hemoglobin (SpHb), oxygen saturation (SpO2), and perfusion index (PI).  This detailed data allows clinicians to predict and proactively address the early signs of hemodynamic instability during critical situations rather than reacting to late indicators and their effects.

"ccNexfin is a unique noninvasive, beat-to-beat, and user friendly cardiovascular monitor that delivers a patient's full hemodynamic profile based on real-time data," stated Rob de Ree, CEO of BMEYE.  "Masimo Rainbow SET Pulse CO-Oximetry plays an integral role in the delivery of this rich hemodynamic data stream by providing critical information about oxygen delivery at the tissue level, which is an essential component of accurate hemodynamic assessment."

Assessment of hemodynamic status is a cornerstone of critical care medicine, routinely used to evaluate, diagnose, and direct therapy to manage the care of at-risk and critically-ill patients.  Hemodynamic monitoring—the direct measurement of blood pressure inside the veins, heart and arteries in relation to cardiac output and systemic vascular resistance—allows clinicians to assess the cardiovascular system and identify early circulation changes that reflect small changes in the way the heart is working to deliver blood and oxygen to tissues and organs. 

Hemodynamic monitoring has traditionally relied upon invasive, costly, intermittent, or unreliable methods to assist clinicians in maintaining adequate oxygen delivery and tissue perfusion to prevent hypoxia and its irreversible damage. The integration of ccNexfin and Masimo Rainbow SET technologies into the emergency department, intensive care units, and anesthesiology care areas has the potential to facilitate earlier diagnosis and the delivery of protocol- and goal-directed therapies that improve patient safety and clinical outcomes. 

Masimo Founder and CEO, Joe Kiani, stated, "The risks and costs associated with invasive hemodynamic monitoring techniques leaves many high-risk patients underserved at a time when assessing hemodynamic stability is most needed.  The synergistic combination of BMEYE and Rainbow SET means that continuous, noninvasive hemodynamic monitoring can benefit more patients at all points along the care path." 

About BMEYE
BMEYE, a Dutch company based in Amsterdam, The Netherlands, develops innovative medical devices with broad application in clinical settings that require cardiovascular monitoring. Specifically, BMEYE produces patient monitors that noninvasively measure continuous blood pressure and cardiac output. BMEYE's mission: BMEYE is the premier provider and will set the standard of noninvasive, beat-to-beat, user-friendly cardiovascular monitoring systems, to improve patient care and reduce healthcare costs.

About Masimo
Masimo (NASDAQ: MASI) develops innovative monitoring technologies that significantly improve patient care—helping solve "unsolvable" problems.  In 1995, the company debuted Measure-Through Motion and Low Perfusion pulse oximetry, known as Masimo SET®, which virtually eliminated false alarms and increased pulse oximetry's ability to detect life-threatening events.  More than 100 independent and objective studies demonstrate Masimo SET provides the most reliable SpO2 and pulse rate measurements even under the most challenging clinical conditions, including patient motion and low peripheral perfusion.  In 2005, Masimo introduced Masimo Rainbow SET® Pulse CO-Oximetry™, allowing noninvasive and continuous monitoring of blood constituents that previously required invasive procedures, including total hemoglobin (SpHb™), oxygen content (SpOC™), carboxyhemoglobin (SpCO®), methemoglobin (SpMet®), and PVI®, in addition to SpO2, pulse rate, and perfusion index (PI).  In 2009, Masimo introduced Masimo Rainbow SET® Acoustic Monitoring™, the first-ever noninvasive and continuous monitoring of acoustic respiration rate (RRa).  Masimo's Rainbow platform offers a breakthrough in patient safety by  helping clinicians detect life-threatening conditions and helping guide treatment options.  Founded in 1989, Masimo has the mission of "Improving Patient Outcomes and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications." Additional information about Masimo and its products may be found at www.masimo.com.

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 timing and market availability of ccNexfin with Masimo Rainbow SET, risks related to our assumptions that the integration of Masimo Rainbow SET with ccNexfin provides advanced noninvasive and continuous hemodynamic monitoring capabilities that have the potential to improve patient safety and outcomes by assisting in the delivery of protocolized, goal-directed therapies, risks related to our belief that the combination of Masimo Rainbow SET and ccNexfin will enable clinicians to detect impending cardiovascular crisis before organ injury ensues, 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 forward-looking 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.

Media Contacts:
Dana Banks    
Masimo Corporation   
+1 (949) 297-7348    

Masimo, SET, Signal Extraction Technology, Improving Outcomes and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, Rainbow, SpHb, SpOC, SpCO, SpMet, PVI, Radical-7, Rad-87, Rad-57,Rad-9, Rad-8, Rad-5,Pulse CO-Oximetry and Pulse CO-Oximeter are trademarks or registered trademarks of Masimo Corporation.

U.S. Department of Homeland Security Issues Federal Warning About Duty-related Carbon Monoxide (CO) Dangers for Firefighters

FED Warns: Even Mild CO Poisoning Can Rob the Brain and Heart of Vital Oxygen— Causing Life-threatening Complications

Irvine, California – January 19, 2010 – Masimo (NASDAQ: MASI), the inventor of Pulse CO-Oximetry™ and Measure-Through Motion and Low Perfusion pulse oximetry, today announced that the U.S. Department of Homeland Security recently issued a Federal warning about the increased risk of carbon monoxide exposure during the winter season—urging heightened awareness and precaution for firefighters, who are at increased risk of duty-related CO danger. The life-threatening consequences of CO poisoning make immediate detection, helped by the noninvasive Masimo Rad-57 Pulse CO-Oximeter, a lifesaving necessity for fire and emergency operations.

The Department of Homeland Security's Emergency Management and Response Information Sharing and Analysis Center (EMR-ISAC) INFOGRAM 1-10, warns that "below freezing temperatures now occurring at many locations throughout the United States potentially increase the risk for carbon monoxide exposure" as people try to use alternative sources for heat. According to the Federal warning, firefighters responding to fires and emergency calls "should understand that CO poisoning is a danger at every fire, regardless of its cause" and "its symptoms – headache, dizziness, fatigue – are often absent or non-specific, making on-scene awareness and detection difficult." Detection is important because it "puts firefighters at significant risk because even mild CO poisoning can deny the brain of oxygen. It can also rob the heart of oxygen, causing immediate life-threatening complications."

Carbon monoxide is a colorless, odorless, and tasteless toxic gas that is extremely difficult to detect—making it the leading cause of poisoning in industrialized countries. Prior to Masimo Rainbow SET Pulse CO-Oximetry, an invasive blood draw followed by laboratory blood gas analysis was the only reliable method for diagnosing CO poisoning. Without immediate access to measure CO in the blood, emergency first responders were at a critical disadvantage. Today, the portable, handheld Masimo Rad-57 Pulse CO-Oximeter provides an accurate and noninvasive way to detect elevated CO levels in the bloodstream in just seconds—helping emergency first responders to quickly and easily diagnose CO poisoning on-the-scene and initiate prompt, lifesaving treatment.

The full warning can be found at: http://www.usfa.dhs.gov/downloads/pdf/infograms/1_10.pdf

About Masimo
Masimo (NASDAQ: MASI) develops innovative monitoring technologies that significantly improve patient care—helping solve "unsolvable" problems. In 1995, the company debuted Measure-Through Motion and Low Perfusion pulse oximetry, known as Masimo SET®, which virtually eliminated false alarms and increased pulse oximetry's ability to detect life-threatening events. More than 100 independent and objective studies demonstrate Masimo SET provides the most reliable SpO2 and pulse rate measurements even under the most challenging clinical conditions, including patient motion and low peripheral perfusion. In 2005, Masimo introduced Masimo Rainbow SET® Pulse CO-Oximetry™, allowing noninvasive and continuous monitoring of blood constituents that previously required invasive procedures, including total hemoglobin (SpHb™), oxygen content (SpOC™), carboxyhemoglobin (SpCO®), methemoglobin (SpMet®), and PVI®, in addition to SpO2, pulse rate, and perfusion index (PI). In 2009, Masimo introduced Masimo Rainbow SET® Acoustic Monitoring™, the first-ever noninvasive and continuous monitoring of acoustic respiration rate (RRa). Masimo's Rainbow platform offers a breakthrough in patient safety by helping clinicians detect life-threatening conditions and helping guide treatment options. Founded in 1989, Masimo has the mission of "Improving Patient Outcomes and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications." Additional information about Masimo and its products may be found at www.masimo.com.

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 case results, risks related to our belief that Masimo Pulse CO-Oximetry/SpCO/Rad-57 provides unique clinical advantages as an immediate, accurate, reliable early detector of elevated CO blood levels, and risks related to our assumptions that Masimo SpCO represents a more rapid, reliable and cost-effective clinical alternative for CO screening, 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 forward-looking 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.

Contact:
Dana Banks
Masimo Corporation
949-297-7348

Masimo, SET, Signal Extraction Technology, Improving Outcomes and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, Rainbow, SpHb, SpOC, SpCO, SpMet, PVI, RRa, Radical-7, Rad-87, Rad-57,Rad-9, Rad-8, Rad-5,Pulse CO-Oximetry and Pulse CO-Oximeter are trademarks or registered trademarks of Masimo Corporation.

New Published Study Finds Masimo PVI® Predicts Fluid Responsiveness as Accurately as Invasive Stroke Volume Variation in Mechanically-Ventilated Patients

Masimo PVI Accuracy Shown to Be Superior to Invasive Central Venous Pressure

Irvine, California – January 14, 2010 – Masimo (NASDAQ: MASI), the inventor of Pulse CO-Oximetry™ and Measure-Through Motion and Low Perfusion pulse oximetry, today announced that a new study published in the January 2010 issue of the European Journal of Anaesthesiology found that Masimo PVI predicts fluid responsiveness as accurately as invasive stroke volume variation (SVV) and more accurately than invasive central venous pressure (CVP) in mechanically-ventilated patients undergoing major surgery.¹ 

Although fluid administration is critical to optimizing patient status and enabling end organ preservation, unnecessary fluid administration is associated with increased morbidity and mortality.  Traditional invasive measurements such as CVP are not reliable to predict whether a patient will benefit from fluid administration, and newer more accurate methods to predict fluid responsiveness, such as SVV, are invasive and costly.  Because SVV has been shown in multiple studies to be an accurate method to predict fluid responsiveness and optimize fluid management in surgical and intensive care patients, the similar accuracy shown with noninvasive PVI indicates that PVI-guided fluid optimization may also help guide fluid management to minimize patient risk and improve outcomes. 

In the study, Dr. Zimmermann and colleagues at University Hospital Regensburg in Germany simultaneously measured PVI (obtained noninvasively using the Masimo Radical-7 Pulse CO-Oximeter), arterial pressure-based SVV (obtained invasively via radial arterial line using the Edwards Lifesciences FloTrac/Vigileo system), and CVP (obtained invasively via central venous catheter), in 20 patients immediately after induction of anesthesia and again after volume administration (6% hydroxyl-ethyl starch).  Patients were classified as responders if stroke volume index (SVI), the amount of blood the heart pumps in each heartbeat, increased by 15% or more, and as non-responders if SVI did not increase 15%. 

Results showed that a PVI value greater than 9.5% predicted fluid responsiveness with 93% sensitivity and 100% specificity, an SVV value greater than 11% predicted fluid responsiveness with 100% sensitivity and 80% specificity, while a CVP value greater than 10.5 mm Hg predicted fluid responsiveness with 66% sensitivity and 40% specificity. 

The researchers concluded that both PVI and SVV "can serve as valid indicators of fluid responsiveness in mechanically-ventilated patients undergoing major surgery," but only PVI "seems to provide a simple alternative for accurate, noninvasive, and continuous preload monitoring."

Masimo Executive Vice President of Medical Affairs Dr. Michael O'Reilly, stated, "Unnecessary fluid administration can increase the risk of serious injury or death, making fluid responsiveness monitoring a growing requirement to advance patient safety.  The researchers at the University Hospital Regensburg have further demonstrated that accurate fluid responsiveness does not require invasive procedures, demonstrating that Masimo PVI is a safe, reliable, and noninvasive alternative to guide fluid management to minimize patient risk and improve outcomes." 

¹ Markus Zimmerman, Thomas Feibicke, Cornelius Keyl, Christopher Prasser, Stefan Moritz, Bernhard M. Graf, and Christoph Wiesenack. "Accuracy of Stroke Volume Variation Compared with Pleth Variability Index to Predict Fluid Responsiveness in Mechanically-ventilated Patients Undergoing Major Surgery."  European Journal of Anaesthesiology 2010; Vol 27, No 00.

About Masimo
Masimo (NASDAQ: MASI) develops innovative monitoring technologies that significantly improve patient care—helping solve "unsolvable" problems.  In 1995, the company debuted Measure-Through Motion and Low Perfusion pulse oximetry, known as Masimo SET®, which virtually eliminated false alarms and increased pulse oximetry's ability to detect life-threatening events.  More than 100 independent and objective studies demonstrate Masimo SET provides the most reliable SpO2 and pulse rate measurements even under the most challenging clinical conditions, including patient motion and low peripheral perfusion.  In 2005, Masimo introduced Masimo Rainbow SET® Pulse CO-Oximetry™, a breakthrough noninvasive blood constituent monitoring platform that can measure many blood constituents that previously required invasive procedures.  Masimo Rainbow SET continuously and noninvasively measures total hemoglobin (SpHb™), oxygen content (SpOC™), carboxyhemoglobin (SpCO®), methemoglobin (SpMet®), PVI®, and acoustic respiration rate (RRa™), in addition to oxyhemoglobin (SpO2), pulse rate (PR), and perfusion index (PI), allowing early detection and treatment of potentially life-threatening conditions. Founded in 1989, Masimo has the mission of "Improving Patient Outcomes and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications." Additional information about Masimo and its products may be found at www.masimo.com.

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 PVI provides unique clinical advantages as an automatic noninvasive measurement of fluid responsiveness, risks related to our assumptions that Masimo PVI is as accurately as invasive stroke volume variation (SVV) and more accurate than invasive central venous pressure (CVP) in mechanically-ventilated patients, and risks related to our assumptions that Masimo PVI represents a more rapid, reliable and cost-effective clinical alternative for assessing fluid responsiveness and help optimize fluid management in surgical and intensive care patients, 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 forward-looking 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.

Contact:
Dana Banks
Masimo Corporation
949-297-7348

Masimo, SET, Signal Extraction Technology, Improving Outcomes and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, Rainbow, SpHb, SpOC, SpCO, SpMet, PVI, RRa, Radical-7, Rad-87, Rad-57,Rad-9, Rad-8, Rad-5,Pulse CO-Oximetry  and Pulse CO-Oximeter are trademarks or registered trademarks of Masimo Corporation.

Masimo Announces Investment in SEDLine Brain Function Monitoring Business

Irvine, California – January 12, 2010 – Masimo (NASDAQ: MASI), the inventor of Pulse CO-Oximetry™ and Measure-Through Motion and Low Perfusion pulse oximetry, today announced a strategic investment totaling $3.5 million in SEDLine, Inc., a newly-formed private company that was formerly operated by Hospira, Inc.  Under terms of the investment agreement, Masimo may increase its investment subject to certain financial and development milestones.  SEDLine's mission is to expand the scope and applications for neuromonitoring.  Masimo's investment will allow SEDLine to continue to support its existing customers, market to new customers, and expand its research and development efforts.

Masimo Chairman and CEO, Joe Kiani, stated, "Multiple leading hospitals in the United States have already chosen SEDLine because they believe, as Masimo does, that SEDLine's current technology is better than competitive brain function monitoring technologies.  Masimo has always been a strong advocate for innovation, patient care, and providing choice in the marketplace, so we are happy to become an investor in SEDLine's continued commercial availability and support this new entity in their goal to enhance and expand the applications for brain function monitoring."

About Masimo 
Masimo (NASDAQ: MASI) develops innovative monitoring technologies that significantly improve patient care—helping solve "unsolvable" problems.  In 1995, the company debuted Measure-Through Motion and Low Perfusion pulse oximetry, known as Masimo SET®, which virtually eliminated false alarms and increased pulse oximetry's ability to detect life-threatening events.  More than 100 independent and objective studies demonstrate Masimo SET provides the most reliable SpO2 and pulse rate measurements even under the most challenging clinical conditions, including patient motion and low peripheral perfusion.  In 2005, Masimo introduced Masimo Rainbow SET® Pulse CO-Oximetry™, a breakthrough noninvasive blood constituent monitoring platform that can measure many blood constituents that previously required invasive procedures.  Masimo Rainbow SET Pulse CO-Oximetry continuously and noninvasively measures total hemoglobin (SpHb™), oxygen content (SpOC™), carboxyhemoglobin (SpCO®), methemoglobin (SpMet®), PVI®, in addition to oxyhemoglobin (SpO2), pulse rate (PR), and perfusion index (PI), allowing early detection and treatment of potentially life-threatening conditions.  In 2009, Masimo introduced Rainbow SET Acoustic Monitoring, offering continuous and noninvasive respiration rate (RRa™) from an innovative acoustic sensor applied to the patient's neck.  Rainbow Acoustic Monitoring is accurate, easy-to-use, and enhances patient compliance – which may help clinicians detect respiratory compromise and patient distress earlier and offer a breakthrough in patient safety.  Founded in 1989, Masimo has the mission of "Improving Patient Outcomes and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications." Additional information about Masimo and its products may be found at www.masimo.com.

About SEDLine
SEDLine, Inc. is a research-focused company with the mission to expand the scope and applications for neuromonitoring. Based on over 10 years of technical and clinical development, the SEDLine core product is a pioneering four-channel brain-function monitor that measures the effects of anesthesia and sedation by simultaneously analyzing, quantifying and displaying both sides of the brain's electrical activity.  The SEDLine monitor is currently in use at some of the nation's leading healthcare institutions. Privately held and based in Irvine, California, SEDLine has an active R&D effort underway to develop advanced brain function monitoring technologies for next generation monitors to further improve the care of patients under anesthesia or sedation.

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 the 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 forward-looking 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.

Contact:
Dana Banks
Masimo Corporation
949-297-7348

Masimo, SET, Signal Extraction Technology, Improving Outcomes and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, Rainbow, SpHb, SpOC, SpCO, SpMet, PVI, RRa, Radical-7, Rad-87, Rad-57,Rad-9, Rad-8, Rad-5,Pulse CO-Oximetry  and Pulse CO-Oximeter are trademarks or registered trademarks of Masimo Corporation.

Masimo Receives Payment Following Court of Appeals Affirmance of Antitrust Liability Verdict Against Tyco HealthCare

Payment is on ruling finding that Tyco, now Covidien, unlawfully maintained monopoly power and utilized unlawful restraints of trade and exclusive dealing arrangements in the pulse oximetry market

Irvine, California – January 11, 2010 – Masimo (NASDAQ: MASI), the inventor of Pulse CO-Oximetry™ and Measure-Through Motion and Low Perfusion pulse oximetry, announced today that it retained $30,064,684 from a payment from Covidien, following the Ninth Circuit Court of Appeals' October 2009 affirmance of a Federal District Court decision that Tyco Healthcare, now Covidien, violated the antitrust laws through anticompetitive business practices related to the sale of its pulse oximetry products. The decision found that Covidien had unlawfully maintained monopoly power in violation of Section 2 of the Sherman Act, and that Covidien's sole-source agreements and market-share based compliance pricing contracts constituted unlawful restraints of trade in violation of Section 1 of the Sherman Act and unlawful exclusive dealing in violation of Section 3 of the Clayton Act. The Ninth Circuit also stated that above-cost bundling discounts when combined with sole-source or market-share–based compliance contracts can be anticompetitive when such practices involve a significant portion of the market. The suit was originally filed by Masimo in 2002. The judgment against Covidien for the antitrust violations was for $43.5 Million; however, the total payment, after reimbursement for legal fees, costs, and interest was $58,982,215. The portion of the total payment from Covidien that was not retained by Masimo was paid to the law firm that handled the trial for Masimo.

Some confusion seems to have occurred in the last few days as a result of another ruling by the Ninth Circuit Court of Appeals in January 2010 in the Allied Orthopedic Appliances case against Covidien. The Allied Orthopedic case has no impact on the finding of antitrust liability in the Masimo case. As noted by the District Court Judge in the Allied Orthopedic decision when referencing the Masimo antitrust case against Covidien, "the instant case [referring to Allied Orthopedic] is 'entirely different' and focuses on overcharges paid by customers on pulse oximetry consumables as a result of Tyco's [now Covidien] foreclosure of generic sensor manufacturers."

Joe E. Kiani, Founder and CEO of Masimo, stated: "We are happy to have received the payment, but we are hopeful that the results that we have fought will be served, which is to help improve patient care while also reducing cost by improving caregivers' access to cost-effective, innovative products. This ruling is the result of one of many efforts Masimo has pursued for many years to open markets so that medical products are judged on their merits rather than artificial restraints on hospital purchasing. Opening competition in the pulse oximetry market has caused pulse oximetry pricing to decrease by over 30%. But, also, many people's lives were either saved or improved as a direct result of their access to Masimo pulse oximeters. "

About Masimo
Masimo (NASDAQ: MASI) develops innovative monitoring technologies that significantly improve patient care—helping solve "unsolvable" problems. In 1995, the company debuted Measure-Through Motion and Low Perfusion pulse oximetry, known as Masimo SET®, which virtually eliminated false alarms and increased pulse oximetry's ability to detect life-threatening events. More than 100 independent and objective studies demonstrate Masimo SET provides the most reliable SpO2 and pulse rate measurements even under the most challenging clinical conditions, including patient motion and low peripheral perfusion. In 2005, Masimo introduced Masimo Rainbow SET® Pulse CO-Oximetry™, a breakthrough noninvasive blood constituent monitoring platform that can measure many blood constituents that previously required invasive procedures. Masimo Rainbow SET Pulse CO-Oximetry continuously and noninvasively measures total hemoglobin (SpHb™), oxygen content (SpOC™), carboxyhemoglobin (SpCO®), methemoglobin (SpMet®), PVI®, in addition to oxyhemoglobin (SpO2), pulse rate (PR), and perfusion index (PI), allowing early detection and treatment of potentially life-threatening conditions. In 2009, Masimo introduced Rainbow SET Acoustic Monitoring, offering continuous and noninvasive respiration rate (RRa™) from an innovative acoustic sensor applied to the patient's neck. Rainbow Acoustic Monitoring is accurate, easy-to-use, and enhances patient compliance – which may help clinicians detect respiratory compromise and patient distress earlier and offer a breakthrough in patient safety. Founded in 1989, Masimo has the mission of "Improving Patient Outcomes and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications." Additional information about Masimo and its products may be found at www.masimo.com.

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 the 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 forward-looking 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.

Contact:
Dana Banks
Masimo Corporation
949-297-7348

Masimo, SET, Signal Extraction Technology, Improving Outcomes and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, Rainbow, SpHb, SpOC, SpCO, SpMet, PVI, RRa, Radical-7, Rad-87, Rad-57,Rad-9, Rad-8, Rad-5,Pulse CO-Oximetry and Pulse CO-Oximeter are trademarks or registered trademarks of Masimo Corporation.

Noninvasive Carbon Monoxide (CO) Screening with Masimo Pulse CO-Oximetry™ Helps Detect and Treat Victims While Identifying Source of CO Poisoning

Newly Published Case Study Shows Masimo SpCO® Helped Avoid Disaster—Saving Transport and Hospital Costs After Incident at Manufacturing Plant

Irvine, California – January 5, 2010 – Masimo (NASDAQ: MASI), the inventor of Pulse CO-Oximetry™ and Measure-Through Motion and Low Perfusion pulse oximetry, today announced that a new case study, published in the January-March 2010 issue of Prehospital Emergency Care, showed that noninvasive screening with Masimo carboxyhemoglobin (SpCO) provided emergency first responders with immediate and accurate detection of CO-poisoned employees and enabled the identification of the source of the poisoning at a manufacturing plant. The early detection and subsequent identification of the CO source helped avert a potential disaster that may have injured or cost the lives of numerous employees and overwhelmed both the local emergency medical services (EMS) system and area hospitals.¹

Carbon monoxide is a colorless, odorless, and tasteless toxic gas that is extremely difficult to detect—making it the leading cause of poisoning in industrialized countries. Prior to Masimo Rainbow SET Pulse CO-Oximetry, an invasive blood draw followed by laboratory blood gas analysis was the only reliable method for diagnosing CO poisoning. Without immediate access to measure CO in the blood, emergency first responders were at a critical disadvantage. Today, the portable, handheld Masimo Rad-57 Pulse CO-Oximeter provides an accurate and noninvasive way to detect elevated CO levels in the bloodstream in just seconds—allowing emergency first responders to quickly and easily diagnose CO poisoning on-the-scene and initiate prompt, lifesaving treatment.

The published case report describes how a suburban fire department and EMS unit in Rock Springs, Georgia responded to a call for a sick employee at a local manufacturing plant. The first responders combined the use of both atmospheric CO testing and Pulse CO-Oximetry to successfully diagnose the cause of the employee's illness and identify the source of the poisoning. Upon arrival, firefighters initially used an atmospheric gas monitor to measure the amount of CO gas circulating in the air and found that the air inside the plant contained elevated, unsafe levels of CO (between 26-70 PPM). However, firefighters searching the building were unable to identify its source. All employees working inside the plant were evacuated and screened for CO poisoning by measuring their SpCO levels using the Masimo Rad-57. Although the source of the poisoning was still unknown, firefighters promptly treated employees with elevated SpCO levels—ranging from 5-18%—on the scene with high concentration oxygen.

While the most obvious source appeared to be a recently installed industrial furnace in the foundry area, no detectable atmospheric CO levels were present anywhere in the area. Although atmospheric CO levels were highest in the assembly area, there were no CO sources in that part of the building. In a second attempt to locate the source of the poisoning, firefighters marked the locations of the employees with the highest SpCO levels on a map of the plant and found that they were all working immediately under air conditioning vents in the assembly area. After tracing the air conditioning vents, firefighters determined that exhaust from the furnace in the foundry were being drawn into a nearby intake vent for the air conditioning system.

According to the lead author of the case study, Bryan E. Bledsoe, DO, FACEP, "The measurement of SpCO levels via Pulse CO-Oximetry provided the missing link to a potentially disastrous puzzle. When initial atmospheric CO monitoring missed the mark—revealing high levels in an area where no CO source existed and the absence of CO in the area where the likely source was found—Masimo SpCO allowed emergency responders to instantly detect biological CO levels, initiate treatment of those in need, and promptly map the exposure point. This potentially saved countless lives while avoiding needless transport of large numbers of employees to area hospitals, preventing significant emergency department and EMS costs—and possibly leaving others in the community without emergency services."

Each year, the lifesaving accounts from fire departments and EMS professionals around the world showcase the importance of the Masimo Rainbow SET Pulse CO-Oximeter to their public safety efforts—helping to save lives, limit long-term brain and heart damage, and create efficiencies and cost savings in the care and delivery of emergency medical services. Most recently, thanks to the Masimo Rainbow SET Pulse CO-Oximeter and swift emergency intervention, more than 50 motel occupants and staff in North Carolina, over 40 families in Beijing, and numerous families in Alabama, Illinois, Colorado, and Washington were saved from becoming carbon monoxide-poisoning statistics.

Masimo Executive Vice President of Medical Affairs Dr. Michael O'Reilly, stated, "Whether suspected or unsuspected, CO poisoning presents a unique challenge to firefighters and EMS personnel who need to know immediately if elevated CO levels are in the bloodstream. However, because CO levels in the air of a particular area don't always correlate to the amount of poisoning in the blood and vice versa, Masimo SpCO is a vital compliment to atmospheric CO monitoring to help first responders save lives, avert mass casualty incidents, and alleviate cost and care burdens on the local emergency system."

¹ Bryan E. Bledsoe, Kevin Nowicki, James H. Creel Jr., Dale Carrison, Harry W. Severance. "Use of Pulse Co-Oximetry as a Screening and Monitoring Tool in Mass Carbon Monoxide Poisoning." Prehospital Emergency Care January-March 2010, Vol. 14, No. 1 : Pages 131-133
Available online at: http://tinyurl.com/spco-averts-mass-casualty

About Masimo
Masimo (NASDAQ: MASI) develops innovative monitoring technologies that significantly improve patient care—helping solve "unsolvable" problems. In 1995, the company debuted Measure-Through Motion and Low Perfusion pulse oximetry, known as Masimo SET®, which virtually eliminated false alarms and increased pulse oximetry's ability to detect life-threatening events. More than 100 independent and objective studies demonstrate Masimo SET provides the most reliable SpO2 and pulse rate measurements even under the most challenging clinical conditions, including patient motion and low peripheral perfusion. In 2005, Masimo introduced Masimo Rainbow SET® Pulse CO-Oximetry™, a breakthrough noninvasive blood constituent monitoring platform that can measure many blood constituents that previously required invasive procedures. Masimo Rainbow SET continuously and noninvasively measures total hemoglobin (SpHb™), oxygen content (SpOC™), carboxyhemoglobin (SpCO®), methemoglobin (SpMet®), PVI®, and acoustic respiration rate (RRa™), in addition to oxyhemoglobin (SpO2), pulse rate (PR), and perfusion index (PI), allowing early detection and treatment of potentially life-threatening conditions. Founded in 1989, Masimo has the mission of "Improving Patient Outcomes and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications." Additional information about Masimo and its products may be found at www.masimo.com.

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 case report results, risks related to our belief that Masimo SpCO provides unique clinical advantages as an immediate, accurate, reliable early detector of elevated CO blood levels, and risks related to our assumptions that Masimo SpCO represents a more rapid, reliable and cost-effective clinical alternative for CO screening, 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 forward-looking 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.

Contact:
Dana Banks
Masimo Corporation
949-297-7348

Masimo, SET, Signal Extraction Technology, Improving Outcomes and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, Rainbow, SpHb, SpOC, SpCO, SpMet, PVI, RRa, Radical-7, Rad-87, Rad-57,Rad-9, Rad-8, Rad-5,Pulse CO-Oximetry and Pulse CO-Oximeter are trademarks or registered trademarks of Masimo Corporation.