New Study Evaluates the Performance of Masimo PVi as a Predictor of Fluid Responsiveness in Mechanically Ventilated ICU Patients
Neuchatel, Switzerland : Masimo (NASDAQ: MASI) announced the findings of a recently published study in which researchers at Bulent Ecevit University in Zonguldak, Turkey compared two noninvasive methods of predicting fluid responsiveness in mechanically ventilated patients in the intensive care unit (ICU): Masimo PVi (pleth variability index, measured noninvasively and continuously using SET pulse oximetry sensors) and dIVC (distensibility index of inferior vena cava, measured noninvasively by radiologists using an ultrasound machine and probe).
The researchers found that Masimo noninvasive and continuous PVi, at a threshold value of >14%, provided 95% sensitivity and 81.2% specificity (p<0.001, AUC = 0.939 (0.857-0.982)), which was statistically significant. Ultrasound, noninvasive dIVC, at a threshold value of >23.8%, provided 80% sensitivity and 87.5% specificity (p=<0.001, AUC = 0.928 (0.842-0.975)), which was also statistically significant. The invasive method, CVP, at a threshold value of ≤7 mmHg, provided 70% sensitivity and 53.1% specificity to predict fluid responsiveness (p=0.066, Area Under the Curve = 0.622 (0.500-0.724)), which was not statistically significant.
The investigators noted that "our results show that noninvasively assessed PVi and dIVC were good predictors of fluid responsiveness after PLR in ICU patients on mechanical ventilation. By contrast, the invasively assessed CVP was a poor predictor of fluid responsiveness as a static variable of cardiac preload." They concluded that, "Both PVi and dIVC may be used to identify the fluid responsiveness of all ICU patients undergoing continuous treatment linked to mechanical ventilation; both methods are easily applied, noninvasive, and can be performed at the bedside."