We do not measure segmental pressures when the ABI is normal, provided that the ipsilateral tibial Doppler waveform is normal. In my experience, a normal ABI in conjunction with an abnormal waveform suggests an element of wall stiffening, (likely with an ABI >1.4 or when an ankle systolic pressure is >60mmHg above the higher brachial.) Also, if requiring only to determine if PAOD affecting the lower extremity is/is not present, it is not necessary to exercise a patient who has an ABI <0.8.
Terry N.
Terry Needham
Heart & Vascular
Erlanger Health System
423-778-5839
PLEASE NOTE MY NEW EMAIL ADDRESS
-----Original Message-----
From: UVM Flownet
[mailto:[log in to unmask]] On Behalf Of
Laura Sikkenga
Sent: Thursday, October 13, 2005
12:39 AM
To: [log in to unmask]
Subject: ABI questions from
curious student
Hello, I am a vascular ultrasound student. Our class
is having a discussion about ABIs and segmental waveforms/pressures. We
understand that many labs start with just ABIs and stop if they are normal. If
they are abnormal, they will continue on to complete segmental waveforms and
pressures.
I am wondering what the consensus is among professionals, about these
questions: Is there an advantage, for the patient (or the lab,) to perform the
segmental pressures if the ABIs are normal? Or, what is the rationale/justification
for only using ABIs when they are normal? Are normal ABIs going to be
definitive in every instance?
Thank you for your consideration,
Laura Sikkenga
Jackson Community College
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