If the probe is pointed in the proper direction far enough from 90 degrees with respect to the axis of the artery, there should be no direction ambiguity and the observation of an inverted waveform is important information and should be retained.  I think I probably learned this from Jeff Field who taught me a lot about vascular testing when I was a young faculty person.




From: UVM Flownet [mailto:[log in to unmask]] On Behalf Of Smith, Matthew G.
Sent: Monday, February 07, 2011 7:53 AM
To: [log in to unmask]
Subject: Re: ABII question


It could be your probe angling as well, and I thought we were talking about pressures, not Doppler waveforms.




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