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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>



-- 
Kemil E Pilotte

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