Boereboom FTJ, Bosman PJ, Blankestijn PJ, Koomans HA
Access blood flow measurements in the low flow range by an
ultrasonic device are accurate
Am Soc Nephrol
J Am Soc Nephrol (abstract)
(Nov) 6:484 1995
One of several abstracts validating the Transonics ultrasound dilution (ID)
approach to access blood flow measurement (see
paper by Krivitski et al in Kidney
Int). The authors validated the ID approach by a pressure-
flow method. First they measured venous pressure at zero
extracorporeal flow, and then, with the upstream access occluded,
then progressively raised extracorporeal blood flow until the
venous pressure equaled the previously measured pressure at zero
extracorporeal flow. At this level of pressure, extracorporeal
flow must be equal to access blood flow.
In 30 patients, the correlation between ID and pressure-flow
estimated of access blood flow was 0.86, and in 14 patients with
low flows (mean 476 ml/min) the correlation was still quite good,
r = 0.79.
Comment: The data suggest that the Transonics device
provides a reliable method of measuring access blood flow,
especially in the low flow range which may be predictive of
impending access failure.
(Daugirdas)
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Am Soc Nephrol
Basic hemodialysis :
Vascular Access: graft/fistula