On Fri, 15 Nov 1996 [log in to unmask] wrote:

> I have never seen an AVM other 
> than in lectures/books.  Could an AVM cause such widespread elevated 
> diastolic velocities?  
>

HI steve again!  
     
     from you answer ("widespread elevated diastolic velocities") i assume
it was indeed global high flow. but is this true?  were mean velocities
kinda high as well as diastolic high/PIs kinda low? 

("could AVM cause such widespread elevated diastolic velocities?")

    only if it involved ALL of the basal arteries! possible but unlikely. 
"signifigant" AVMs have VERY high MVs and VERY low PIs.  usually high
MVs/low PIs seen only in feeding vessels with normal MVs/PIs every where
else.
     have only seen a few AVMs myself with Duplex/TCD (have seen more on
angio and examples from other techs/labs) but would expect to see high
flow in only one or two flow channels. (eg saw one involving left
vert/CCA/ECA with VERY high MVs VERY low PIs, normal velocities everywhere
else, eg from TCD class sheila shows *hi sheila!* i think was mainly
MCA/PCA one side, other side and ACA etc would have normal MVs/PIs) ?know
what i mean? 

(:watson