New Study Investigates the Utility of Masimo ORi™ (Oxygen Reserve Index) in Providing Early Detection of Blood Oxygenation Decrease During One-Lung Ventilation
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
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Masimo Root® with Radical-7® and ORi™ (Photo: Business Wire)
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
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.
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.
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.
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.
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.
Taenzer AH et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
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.|
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; risks related to our belief that Masimo noninvasive medical breakthroughs provide cost-effective solutions and unique advantages; 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, 949-396-3376
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