Dearest Bonnie, we really have to stop meeting like this, the FlowNet
is beginning to squawk.
"Cry havoc and let loose the hounds of war"...
It has been my experience that the majority believes volume flow
measurements are not worth the crusted remains of left over gel on a
rectal transducer. Was that an overtly strong statement?
If the measurements are not worth left over gel, why do most modern
imagers have the capability to perform this task? If you our
equipment has color, power angio, 3-D, tissue harmonic imaging and
other state-of-the-art bells and whistles, why not see how (and if)
While I agree it is highly sensitive, and dependent on numerous
variables, we use it on all of our graft surveillance patients.
Frankly, it would be pretty weird for me to not use these
measurements. If you consider the patient as your baseline, their
first visit as your reference point, I believe you would be surprised
to how useful these measurements will become.
Having said this, you must be able to reproduce a measurement with a
15% variability and have a very strict protocol on how you perform the
Salles-Cunha SX: Variance of arterial blood flow rates in the leg.
Proceedings of the San Diego Symposium on Noninvasive Vascular
Diagnostic Techniques in Vascular Disease, p 125, 1988.
Waters MA: Duplex analysis of blood volume in lower extremity venous
bypass grafts. J Vasc Technol 14:142-143, 1990 (abstract).
Zierler BK: Accuracy of duplex scanning for measurement of arterial
volume flow. J Vasc Surg 16:520-526, 1992.
Guthrie SL: Color velocity imaging quantification, the effect of
interoperator variability and operator repeatability. J Vasc Technol
17:200, 1993 (abstract).
Kupinski AM: Lower extremity flow / velocity profiles in the elderly.
J Vasc Technol 17:123-126, 1993.
Salles-Cunha SX: Graft blood flow rate and systolic velocity:
Measurement variability. J Vasc Technol 18:173-176, 1994.
Salles-Cunha SX: Graft surveillance and variance of flow variables:
Number of measurements per test. J Vasc Technol 18:195, 1994
Picot PA: Quantitative volume flow estimation using velocity
profiles. IEEE Trans Ultrason Ferroelectrrics Freq Control
Scissons RP: Blood flow rates and systolic velocities in
infrainguinal bypass grafts. J Vasc Technol 19:169-172, 1995.
Winkler AJ: An experimental study of the accuracy of volume flow
measurements using commercial ultrasound systems. J Vasc Technol
My apologies for misprints, misspelling, omitting of contributing
authors, and, standing too long on my soap box to preach ye glory and
ye relevance of 'Q'.
YrMstHmble&ObtSvt (luv the svt ending)
______________________________ Reply Separator
Subject: Re: flow volume measurements
Author: "Bonnie Johnson" [SMTP:[log in to unmask]] at PHS
Date: 5/14/99 12:18 PM
Can someone comment on the accuracy of volume flow measurements and provide
some references. Thanks.
Bonnie L. Johnson, RDMS, RVT
UCSF Stanford Health Care
Director, Vascular Laboratory Services
Division of Vascular Surgery