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Study Evaluates Performance of Masimo SpHb® in Trauma Patients with Low Hemoglobin Levels

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Masimo (NASDAQ: MASI) announced today the findings of a recently published study in which researchers at Cairo University in Egypt evaluated the performance of Masimo SpHb®, noninvasive, continuous hemoglobin measurement, in trauma patients with low hemoglobin levels.1

In the prospective, observational study, Dr. Gamal and colleagues sought to evaluate SpHb measurements on trauma patients with low hemoglobin levels (below 8 g/dL) because trauma patients are “vulnerable to frequent blood transfusion.” They enrolled 70 adult patients with hemoglobin levels lower than 8 g/dL who were admitted to the emergency department (ED) of Cairo University Hospital and scheduled for surgical intervention. While in the ED, the patients’ SpHb was continuously monitored using a Masimo Radical-7® Pulse CO-Oximeter®, with initial baseline measurement recorded as well as measurement after each unit of blood was administered. The researchers simultaneously obtained 2 mL venous blood samples, which were analyzed using a Coulter LH 750 Beckman analyzer (LabHb).

A total of 184 samples with corresponding SpHb values were collected for final analysis. The distribution of LabHb values was 20 (11%) below 6 g/dL, 97 (53%) between 6-7 g/dL, and 67 (36%) between 7-8 g/dL. The accuracy of SpHb in comparison to LabHb was assessed using Bland-Altman analysis. The level of agreement between SpHb and LabHb showed a bias of 0.12 g/dL and limits of agreement of -0.56 g/dL and 0.79 g/dL.

To determine the accuracy of SpHb as a trend measurement, the researchers also observed the change in hemoglobin (DeltaHb) before and after each unit of blood was transfused, for both methods. The level of agreement between DeltaSpHb and DeltaLabHb showed a bias of -0.05 g/dL and limits of agreement of -0.62 g/dL and 0.51 g/dL.

The researchers concluded that “SpHb showed accurate precision in both absolute values and trend values compared to LabHb measurement in trauma patients with low hemoglobin levels.” They also suggested several possible uses for SpHb, including as “a trend monitor that would alert the physician to any sudden bleeding mishaps,” and as a “good supplementary measure” to LabHb that can “save time and effort.”

The researchers acknowledged that this study is not sufficient to alone answer the question, “Can we transfuse blood relying solely on SpHb or not?” However, they noted that their findings add to the body of evidence in favor of SpHb and suggest the need for additional research regarding the role of Masimo technology in blood transfusion decisions.

SpHb monitoring is not intended to replace laboratory blood testing. Blood samples should be analyzed by laboratory instruments prior to clinical decision making.

@MasimoInnovates | #Masimo

The accuracy specification of SpHb is 1 g/dL ARMS* in the range of 8-17 g/dL. SpHb accuracy has been validated on healthy adult male and female volunteers and on surgical patients with light to dark skin pigmentation against an invasive laboratory device. SpHb accuracy has not been validated in conditions of motion or low perfusion.

*ARMS accuracy is a statistical calculation of the difference between device measurements and reference measurements. Approximately two-thirds of the device measurements fell within ± ARMS of the reference measurements in a controlled study.

Reference

  1. Gamal M, Abdelhamid B, Zakaria D, Abd El Dayem O, Ashraf R, Fawzy M, and Hasanin A. Evaluation of noninvasive hemoglobin monitoring in trauma patients with low hemoglobin levels. Shock. July 2017. DOI: 10.1097/SHK. 0000000000000949.

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 16 of the top 20 hospitals listed in the 2016-17 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/cpub/clinical-evidence.htm.

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; 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.

Contact information

Masimo
Evan Lamb, 949-396-3376
elamb@masimo.com

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