The issue of reflux time has been around for decades. I have seen 1 sec, 2 sec and 3 sec used as a cutoff time for normal, but little in the formal research arena.
This reference might help;
Labropoulos N, Tiongson J, Pryor L, et al. Definition of Venous Reflux in Lower Extremity Veins. J Vasc Surg. 2003; 38: 793-798. Their cutoff values for "normal" subjects were <500 ms in superficial veins and calf veins, <350 ms for perforators, and <1000 ms for femoropopliteal veins. Longer duration of reflux was observed in supine subjects than standing subjects.
If you are going to use this reference, I would strongly suggest reading the entire article.
And of course, if the Valsalva maneuver or manual compression is not adequate, reflux measurements are pretty useless.
Bill Johnson, RVT, FSVU
From: UVM Flownet on behalf of Lygia Waters
Sent: Wed 1/30/2008 9:45 AM
To: [log in to unmask]
Subject: Venous insufficiency
Help! We started doing venous insufficiency exams along with a normal venous doppler,(e.g. we scan the patient's GSV, LSV and for perforaters while they are standing)
What we can't find is any definite grading scale for venous reflux. At a previous job, the vascular surgeon used >2sec of reflux = significant reflux. However, i can't find that published anywhere, or any other table or literature that grades the severity of the reflux as found on ultrasound.
Can anyone helP?
Thanks! L. Waters, RVT
P.S. I love this forum!!!! So useful!
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