[Reliability and perspectives in peroperative flowmetry. An original computer-assisted ultrasonic technic].
To mitigate the lack of reliability of currently used flowmetry technics, an original method was developed based on a single window 15 MHz Doppler flowmeter and an Apple IIe computer with data acquisition system. Eleven successive measurements of instantaneous rate were made in an arterial section. A mean flow was determined by integration of mean rate in section. The reliability of the method was evaluated by an experimental study on a hydrodynamic bench reproducing physiologic flow conditions with an error always less than 8%. An in vivo study in 30 patients provided 100 measurements of arterial flow before and after surgical arterial reconstruction. The mean error value was less than 10%. Among the risks of error, those due to the probe was reduced by specially conceived probes. The most important factor was that of respiration, this latter factor imposing an integration time of rate of signal of 30 seconds to eliminate errors due to respiration. The conventional measurement time for other configurations is 6 seconds but this leads to a mean error of 25% which can attain 60%. The perspective of miniaturization of the apparatus in the near future with acceleration of measurements using a multi-window Doppler should allow flow measurement in 30 seconds and control of surgical reconstructions (on healthy arteries, vein grafts and prostheses but excluding PTFE). Similarly, it should be possible to improve evaluation of so-called vasoactive drugs.
Bergeron
P
P
Service de chirurgie cardio-vasculaire, Hôpital St-Joseph, Marseille.
Jausseran
J M
JM
Reggi
M
M
Courbier
R
R
Pugliesi
V
V
Rieu
R
R
Garcia
P
P
Pelissier
R
R
D001157:Arterial Occlusive Diseases / Q000503:physiopathology / Q000601:surgery; D001158:Arteries / Q000502:physiology* / Q000503:physiopathology; D001783:Blood Flow Velocity; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007432:Intraoperative Period; D007866:Leg / Q000098:blood supply*; D008838:Microcomputers; D012212:Rheology; D014463:Ultrasonography / Q000295:instrumentation*
Fiabilité et perspectives de la débimétrie per opératoire. Une technique ultrasonore informatisée originale.