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European Heart Journal 1990 11(4):361-367;
Copyright © 1990 by the European Society of Cardiology.
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© 1990 The European Society of Cardiology

In vitro analysis of jets by Doppler colour flow imaging: The importance of time to maximum jet area

E. M. OHMAN, SH. HELMY, ED. SHUGHNESSY, D. B. ADMAS and J. KISSLO

Duke University, Department of Medicine and Mechanical Engineering Durham, North Carolina, U.S.A

Received 10 April 1989; revised 19 June 1989; .

Address for Correspondence: Magnus Ohman MB, Box 3151, Duke University Medical Center, Durham, North Carolina 27710, U.S.A

Abstract

Regurgitant jets were simulated in vitro and analysed using Doppler colour flow imaging. The regurgitant volumes were estimated using total jet area (JA), variance area (VA), and the maximum area of variance x time to maximum area of variance (MAVT). Both flow rate and injected volume were significantly correlated to area of variance (r = 0.89 and r = 0.98, respectively) for a given orifice size. When MAVT was analysed, it correlated better to injected volume (r = 0.97) at a fixed flow rate, than varying flow rate (r = 0.69) at a fixed injected volume. The relationship between MAVT and injected volume was also examined with varying flow rate. There was a highly significant correlation between MAVT and injected volume under these circumstances (r = 0.99). A similar relationship between MAVT and injected volume was found when the orifice size was altered. Using multivariate regression analysis the injected volume was best defined by MAVT ( R2 = 0.88). The addition of orifice size only improved the fit to the model marginally (R2 = 0.90).

Key Words: Colour Doppler flow imaging • regurgitant jets • regurgitant time


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