Pulse oximetry detects fluid volume


Intravenous products: Masimo the inventor of Pulse CO-Oximetry and Measure-Through Motion and Low-Perfusion pulse oximetry, today announce that a new clinical study, independently conducted by researchers from the University of California-San Francisco (UCSF), demonstrates that Masimo PVI accurately and reliably reflects acute changes in intravascular fluid volume (preload). The study, presented at the International Anesthesia Research Society (IARS) 83rd Scientific Congress on March 14th in San Diego, Calif., affirms PVI as a highly predictive indicator of patient fluid status.

Assessing whether a patient needs fluid to increase their cardiac index (amount of blood the heart pumps each minute) is one of the biggest challenges anesthesiologists face during surgery. Although fluid administration is critical to optimizing patient status and enabling end organ preservation, unnecessary fluid administration is associated with increased morbidity and mortality and traditional invasive measurements are only 50 to 60% accurate at predicting improvement in cardiac index after volume administration. PVI—a new method for noninvasive and automatic assessment of fluid responsiveness—has been shown in multiple studies to predict fluid responsiveness in mechanically ventilated patients, helping clinicians to optimize fluid administration and improve patient outcomes.

In the study, Errol P. Lobo, M.D., PhD, at UCSF in San Francisco, Calif., and colleagues used Masimo Radical-7 Pulse CO-Oximeters to noninvasively measure and continuously track PVI, perfusion index (PI) and pulse rate (PR) data during 16 consecutive liver transplant operations. Researchers extracted and analyzed the noninvasive data at three critical points where preload changes occur rapidly: 1) immediately before clamping, 2) during clamping, and 3) immediately after clamping of the inferior vena cava (IVC), and found that PVI changed rapidly and significantly in response to known acute changes in preload (clamping and unclamping of IVC) in 100% of the cases.

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