Don't feel too bad, I know most of my students probably think that I
do not know what I am talking about either, most certainly when they
start going to clinical and get someone else's opinion...
On this topic, I will concur with what Denise answered, and will add
that in class I basically tell them to:
1- make sure the Doppler is position correctly, parallel to the vessel
2- try, as much as possible to remain below 60 degrees
3- try to keep similar angles throughout the exam (at least for each
4- have comparable angles for calculating you RAR (I think this is the
trickiest part, since a ratio is used to eliminate some of the errors
or changes and the last thing you want to do is introduced more errors
by dividing velocities taken at very different angles).
Otherwise, as Denise noted, a bruit is a bruit, a significant stenosis
is .. so if you get velocities of 300 versus 350 cm/s with another
angle, does it really make that much difference in diagnosis!!!! no.
Quoting Don Ridgway <[log in to unmask]>:
> Okay, bear with me, please. A couple of techs are wrangling about
> proper angles while doing renal Doppler: One says that you can't go
> below 45 degrees, even if the actual angle relative to vessel wall
> is zero degrees. The other says it's better to use the actual angle
> (assuming it's not possible to obtain a 50-60 degree angle).
> I most certainly know what I think, but a few opinions from
> heavyweights would be helpful. (These young folks think I'm half
> senile and don't listen to me.)
> Don Ridgway
> Grossmont Hospital
> Grossmont College
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