Jeannette Isaacson is, I believe, currently involved in collecting data
to adjust the Doppler criteria to match 0 degree velocities in renal
studies. Maybe she or one of her collaborators in this study could shed
some more light. I believe in the last presentation I saw from her that
there was initial data to support a correlation of approximately 180%
when adjusting 0 degree velocities to fit 60 degree criteria.
-----Original Message-----
From: UVM Flownet [mailto:[log in to unmask]] On Behalf Of Norma
Vandenberghe
Sent: Monday, September 17, 2007 8:12 AM
To: [log in to unmask]
Subject: Re: Those darn Doppler angles again
I could give you the cosine values to prove it, but maybe we could get
Kirk Beach to do that. The closer you get to 0 degrees, the more
accurate the velocity measurement. But be cautious; velocities obtained
at 0 degrees in the distal renal arteries will often (usually) be about
50% of those taken at 60 degrees at the origins (probably due to angle
errors). There is no hard data to confirm this, but we may need new
criteria for using low angles of incidence. Verify what you get with it
being focal, post-stenotic turbulence and that you see evidence of
stenosis from both directions (midline and flank.
Norma J. Vandenberghe, RN, RVT
Technical Director
Overlake Internal Medicine Associates
Diagnostic Vascular Laboratory
1135 116th Ave NE #600
Bellevue, WA 98044
425 450-6192
[log in to unmask]
-----Original Message-----
From: UVM Flownet [mailto:[log in to unmask]] On Behalf Of Don
Ridgway
Sent: Friday, September 14, 2007 9:51 PM
To: [log in to unmask]
Subject: Those darn Doppler angles again
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
To unsubscribe or search other topics on UVM Flownet link to:
http://list.uvm.edu/archives/uvmflownet.html
DISCLAIMER: This message is confidential, intended only for the named
recipient(s) and may contain information that is privileged or exempt
from disclosure under applicable law. If you are not the intended
recipient(s), you are notified that the dissemination, distribution or
copying of this information is strictly prohibited. If you received this
message in error, please notify the sender then delete this message.
To unsubscribe or search other topics on UVM Flownet link to:
http://list.uvm.edu/archives/uvmflownet.html
To unsubscribe or search other topics on UVM Flownet link to:
http://list.uvm.edu/archives/uvmflownet.html
|
