American journal of critical care : an official publication, American Association of Critical-Care Nurses
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Am. J. Crit. Care
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Observational Study
Pleth variability index and fluid responsiveness of hemodynamically stable patients after cardiothoracic surgery.
Fluid responsiveness is a measure of preload dependence and is defined as an increase in cardiac output due to volume expansion. Recent publications have suggested that variation in amplitude of the pulse oximetry waveform may be predictive of fluid responsiveness. The pleth variability index (PVI) was developed as a noninvasive bedside measurement of this variation in the pulse oximetry waveform. ⋯ Among postoperative cardiac surgery patients, PVI is not reliable for predicting fluid responsiveness as measured by pulmonary artery catheter thermodilution, regardless of ventilatory status.