IRVINE, Calif., May 13, 2013 /PRNewswire/ -- Masimo (NASDAQ: MASI) announced today that three new clinical studies evaluating Masimo noninvasive patient monitoring technologies were presented before the world's leading anesthesia educators and investigators at the International Anesthesia Research Society (IARS) Annual Meeting in San Diego. The following studies highlight the positive clinical outcomes and patient safety impact of Masimo's unique noninvasive measurement technologies, including: total hemoglobin (SpHb®), acoustic respiration rate (RRa), and SedLine® brain function monitoring.

Noninvasive Total Hemoglobin (SpHb)
Researchers at the Resuscitation Research Laboratory at the University of Texas Medical Branch measured SpHb continuously with a Masimo Radical-7 Pulse CO-Oximeter®, and compared measurements with total hemoglobin (tHb) by arterial blood sampling in volunteer patients under general anesthesia. Researchers said, "SpHb lends itself to effective trend analysis and accurate assessment of changes in tHb during periods of significant hemodilution. Trending was highly reliable in terms of concordance and trending ability."1

rainbow® Acoustic Monitoring for RRa and SedLine
Researchers at Loma Linda University School of Medicine used standard monitoring of patients during procedural sedation, which included pulse oximetry (SpO2) and noninvasive blood pressure, in addition to rainbow® acoustic monitoring (RRa, Rad-87 Pulse CO-Oximeter®), and depth of sedation monitoring using Patient State Index (PSI™) and SedLine. They found, "Respiratory depression, apnea and deep sedation were common in our cohort of patients receiving procedural sedation. These events may not be detected by standard care monitoring of SpO2 and blood pressure. We found concurrent excess sedation or respiratory depression with SpO2 ≤92% in some patients. Our results indicate that advanced respiration rate and brain function monitoring should be considered for patients undergoing procedural sedation."2

In another study, researchers David R. Drover, M.D., and Pedro Tanaka , M.D., at Stanford University School of Medicine, evaluated results of patients who underwent total knee arthoplasty and were provided monitored anesthesia care (MAC) – a combination of sedation and/or analgesic drugs common for less invasive procedures, with the benefit of fewer side effects such as respiratory depression and apnea. Patients received routine ASA monitoring as well as measurement of respiration rate by rainbow® acoustic monitoring (RRa, Rad-87) and depth of sedation measured by PSI and SedLine. Researchers concluded: "Both apnea and excessive sedation occur in patients undergoing MAC but do not occur at the same time. This is consistent with our knowledge of the anatomy of the upper airway and risks of airway obstruction. This suggests that both respiration rate monitoring for the detection of hypoventilation and brain function monitoring for depth of sedation are indicated for patients being provided sedation."3

1 Marques N, Kramer G, Salter M, Voigt R, Kinsky M. "Trending, Accuracy and Precision of Noninvasive Hemoglobin Monitoring During Hemodilution." Proceedings of the International Anesthesia Research Society, May 7, 2013. San Diego. S-386

2 Applegate R, Macknet M, Qoshlli S, Mehdizadeh A, Jacobson P, Neumann M, Allard M. "Incidence of Deep Sedation and Respiratory Compromise During Procedural Sedation" Proceedings of the International Anesthesia Research Society, May 7, 2013. San Diego. S-298

3 Drover D, Tanaka P. "Depth of Sedation Does Not Predict Episodes of Apnea." Proceedings of the International Anesthesia Research Society, May 7, 2013. San Diego. S-302

*To see a summary of all known clinical studies and abstracts on Masimo technologies and noninvasive measurements, please visit: