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Pulse Volume Recording

The Pulse Volume Recording (PVR) test is a pneumo-plethysmographic test used for detection of the segmental volume changes in the limb which result from the flowing blood, as a function of the cardiac cycle.

Similar to the Segmental Blood Pressure (SBP) measurements, dedicated pressure cuffs are placed around all limb segments prior to initiating the test. The cuffs are then inflated to a pressure that would occlude the venous return, yet will maintain the arterial flow un-obstructed. This pressure is typically 65 mmHg.

  PVR using Hokenson cuffs

Once the cuff pressure is stabilized, the waveform signals which reflect the segmental volume changes can be recorded. The clinicians are normally interested in the qualitative shape of the waveforms: a "normal" PVR consists of a rapid systolic upstroke and a rapid downstroke with a prominent dicrotic notch. With increasing arterial disease the PVR waveform becomes attenuated, the upstrokes and downstrokes are less prominent and the PVR amplitude decreases and ultimately becomes flat.

Below is an example of a PVR waveform measured using Viasonix FALCON/Pro.

 
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