Usually this is standardized by the equipment software. I've personally, never had to adjust the inflation parameters for PVR waveforms, just the size or baseline. It's typically around 70mmHg.  It may vary slightly from patient to patient based on limb size or other variables.  I'm sure an excessive amount of inflation would affect the waveforms (if you inflate it to 200mmHg the waves will likely disappear).  As stated before, this parameter should be standardized and you shouldn't have to adjust it at all.  We also use Unetix equipment.

 Matt

-----Original Message-----
From: UVM Flownet [mailto:[log in to unmask]] On Behalf Of Shannon Abuan
Sent: Monday, July 26, 2010 23:42
To: [log in to unmask]
Subject: Concern Re: PVRs need info ASAP

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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