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A New
Echo-Cardiographic Approach in Assessing Pulmonary Vascular Bed in
Patients with Congenital Heart Disease
Suzan El-Hefnawy
Cardiology Department, Faculty of Medicine, Tanta
University, Egypt.
Tanta Med. Sc. J 2007; 2(3):61-67
Article type: Original article
Aim: We thought to test whether the ratio of peak
tricuspid regurgitant velocity (TRV, m/sec), to the right
ventricular out flow tract time-velocity integral (TVIRVOT, Cm/sec)
obtained by Doppler echocardiogrophy (TRV/TVIRVOT) provides a
clinically reliable method to determine pulmonary vascular
resistance (PVR). Patients & Methods: Simultaneous Doppler
echocadiographic examination and right-heart catheterization were
performed in 25 patients. The ratio of TRV/TVIRVOT was then
correlated with invasive PVR measurements using regression analysis.
An equation was modeled to calculate PVR in wood units (WU), using
echocardiography, and the results were compared with invasive PVR
measurement using the Bland-Altman analysis. Results: As calculated
by Doppler echocardiography, TRV/TVIRVOT results correlated well
(r=0.92) with invasive. PVR measurements the Bland-Altman analysis
between PVR obtained invasively and that by echo cardiography, using
the equation: PVR=TRV/TVIRVOT x 10 + 0.16, showed satisfactory
limits of agreement. Conclusion: Doppler echocardiography may
provide a reliable, non invasive method to determine PVR.
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