New Study Investigates the Utility of Continuous Noninvasive Hemoglobin Measurement With Masimo SpHb® for Reflecting Real-time Iatrogenic Hemodilution During Incremental Fluid Administration
Masimo (NASDAQ:MASI) announced today the findings of an abstract presented at Euroanaesthesia 2018 in which researchers compared Masimo noninvasive and continuous hemoglobin (SpHb®) to intermittent and invasive lab hemoglobin (LabHb) in reflecting iatrogenic hemodilution during incremental fluid administration of patients undergoing major surgery.1
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Masimo Root® with Radical-7® and SpHb® (Photo: Business Wire)
In the study, Dr. Azriel Perel, Dr. Serban Bubenek, and colleagues at the Emergency Institute for Cardiovascular Diseases in Bucharest examined the effects of incremental fluid loading on oxygen delivery and on LabHb and SpHb as markers of possible iatrogenic hemodilution, which can necessitate blood transfusions that might otherwise be avoided. 40 adult patients undergoing major gastrointestinal or vascular surgery were enrolled. Oxygen saturation (SpO2) and SpHb were continuously measured using a Masimo Radical-7® Pulse CO-Oximeter®. LabHb and partial pressure of oxygen (PaO2) were intermittently, invasively measured using an ABL800 Radiometer. Cardiac output (CO) and stroke volume (SV) were continuously, invasively measured using an Edwards Vigileo monitor. Oxygen delivery (DO2) was calculated as: CO*((Hb*1.38*SpO2)+PaO2*0.0031)). Parameter values were recorded after induction of anesthesia (T0), and 5 minutes after successive 250 ml colloid fluid challenges (FC) (T1, T2, and T3). Patients were given the second and third fluid challenges if at each stage SV increased by at least 10%.
All 40 patients received the first FC, 33 received the second, and 22 received the third. The researchers found that there was “a statistically significant decrease in mean SpHb and LabHb after each FC.” For patients who received all 3 FCs, they noted that “SpHb and LabHb decreased significantly and similarly after each FC.” After infusion of the full 750 ml, SpHb and LabHb decreased by 1.66+/-0.67 g/dL and 1.7+/-0.7 g/dL, respectively, a decrease in Hb values which “explains the observed decrease in the DO2.”
The researchers concluded, “Fluid loading as part of goal-directed therapy may cause a paradoxical decrease in DO2 due to the development of iatrogenic hemodilution. The development of iatrogenic hemodilution is reflected by a real-time decrease in the SpHb trend, which is similar to the intermittent LabHb trend.”
Dr. Azriel Perel commented, “In many studies on perioperative and septic patients, the patients who received more fluids seem to have received significantly more blood transfusions. The most probable reason for that is the development of acute dilutional anemia causing the hemoglobin value to decrease below the ‘transfusion threshold.’ This study clearly shows that fluid administration, given as part of the conventional perioperative goal-directed strategy aimed at maximizing the cardiac output, does indeed cause a significant acute decrease of the hemoglobin concentration, leading to a paradoxical decrease in oxygen delivery. This iatrogenic decrease in hemoglobin concentration may cause physicians to administer otherwise avoidable RBC transfusions. Our study also demonstrates that continuous monitoring of hemoglobin (SpHb) through Masimo Pulse CO-Oximetry sensors may detect the development of such iatrogenic hemodilution in real time.”
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.
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1. Bubenek S, Valeanu L, Popescu M, Cacoveanu M, Tomescu D, and Perel A. Optimization of cardiac output by incremental fluid administration is associated with iatrogenic hemodilution and a paradoxical decrease in oxygen delivery. Proceedings from Euroanaesthesia 2018, Copenhagen, Denmark.
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.
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 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.
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.
Evan Lamb, 949-396-3376
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