PVi® is a measure of the dynamic changes in the Perfusion Index (Pi) that occur during one or more complete respiratory cycles.
Pi reflects the amplitude of the pulse oximeter waveform and is calculated as the pulsatile infrared signal (AC or variable component), indexed against the non-pulsatile infrared signal (DC or constant component). Pi is expressed as a percentage (0.02-20%).
The calculation for PVi® is accomplished by measuring changes in Pi over a time interval where one or more complete respiratory cycles have occurred.
PVi® automatically and continuously calculates the respiratory variations in the plethysmographic waveform.
PVi® may show changes that reflect physiologic factors such as vascular tone, circulating blood volume, and intrathoracic pressure excursions.
PVi® Calculation: How It Works
Follow the link for available PVi studies.
Perioperative Care Solutions
Caution: Federal (USA) law restricts this device to sale by or on the order of a physician. See instructions for use for full prescribing information, including indications, contraindications, warnings, and precautions.