Circulation, Vol 83, 605-613, Copyright © 1991 by American Heart Association
BC Maciel, VA Moises, R Shandas, IA Simpson, M Beltran, L Valdes-Cruz and DJ Sahn
Regurgitant jet dimensions imaged by color Doppler flow mapping have been
used to evaluate the severity of valvular insufficiency in clinical
studies. To study the effect of pressure and volume within the receiving
chamber on the magnitude of spatial distribution of regurgitant jets
assessed by color Doppler techniques, we designed a simple constant-flow
model in which a jet was driven through a known orifice (1.5 mm2) into a
compliant receiving chamber by a steady-flow pump. A distal tube at the
outflow closed the system and maintained the volume of the chamber constant
during pump operation. We varied flow rate from 60 to 270 ml/min into
elastic balloons with different static compliances of 1, 2, 4.5, and 9
ml/mm Hg (pressures of 57, 28, 18, and 8 mm Hg, respectively); the balloons
served as receiving chambers at the constant volume of 150 ml. We also
evaluated the effect of different volumes of a receiving chamber (110, 130,
and 150 ml and pressures of 5, 15, and 24 mm Hg) with a static compliance
of 2 ml/mm Hg over the same range of flow rates. For each of the different
balloons, jet area correlated linearly with the jet velocity across the
orifice (r = 0.98, 0.99, 0.98, and 0.97) and also with flow rate (r = 0.97,
0.99, 0.98, and 0.99). At the same flow rate and volume of receiving
chamber, however, the jet area imaged by color Doppler decreased as the
pressure in the receiving chamber increased, although receiving-chamber
volume was constant.(ABSTRACT TRUNCATED AT 250 WORDS)
ARTICLES
Effects of pressure and volume of the receiving chamber on the spatial distribution of regurgitant jets as imaged by color Doppler flow mapping. An in vitro study
Department of Pediatrics, University of California, San Diego, La Jolla.
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