As the volume of a cuff is increased the sensitivity of the cuff to pressure variances is affected. The larger the volume, the more the dampening of pressure plethysmography (waveform amplitude for a given change in pressure).  Proper wrapping of a cuff will insure the accuracy of PVR waveforms as well as the amplitude settings of the equipment (graph size).  The primary task of the sonographer is to insure that volumes are a minimum and similar across comparable cuffs on the other limb.  The volume reading on the Unetixs will also allow you to determine if a cuff or hose is leaking.  It is possible to change PVR procedures to a volume calibration but is technically more difficult. 
If you need further assistance, you may contact me at [log in to unmask]. 

On Mon, Jul 26, 2010 at 10:41 PM, Shannon Abuan <[log in to unmask]> wrote:
Hi To Everyone:
Our Radiology Dept. recently started performing Arterial exams for a vascular
surgeon. Vascular surg. insisting on doing PVR's. The machine I am using is a
Unitex Multilab Series 2. One of the parameters shown is the amount of volume
on the limb being evaluated, measured in cc. ex: 600cc.

My question is: Does of the amount of cc  matter on the PVR?  I was trained that
the pressure had to be approx. 65mmHg and the speed had to be 25.

This vascular surgeon is complaining that an excessive amount of cc placed on
the limb will change the outcome of the waveform of the PVR.

Example : 600cc with 65mmHg at High Thigh vs 900cc with 65mmHg at High
Thigh

Will there be a difference in a normal waveform??

Please respond ASAP--I need info by 7/27
Thanks for all the information--responses!!

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