A novel approach to calculation of mean mitral valve gradient by Doppler echocardiography.

Publication/Presentation Date

11-1-2001

Abstract

The Doppler-derived mean mitral valve gradient (DeltaP(M)) based on the simplified Bernoulli equation requires computerized integration of the Doppler signal and evaluation by a technician with the use of special equipment. We have noted empirically that the DeltaP(M) can be derived by the equation DeltaP(M) = (P(P) - P(T)) / 3 + P(T). Peak (P(P)) and trough (P(T)) pressures are derived from the simplified Bernoulli equation (P = 4V(2)). This equation can be used by the experienced observer to calculate the mean mitral valve gradient without specialized equipment. The purpose of this study is to validate the above empirically derived equation in patients with mitral stenosis. We retrospectively reviewed 41 consecutive studies done at our institution from October 1, 1997, through September 30, 1998, in which mean mitral valve gradient was assessed. Each study was reviewed and the DeltaP(M), P(P), and P(T) were measured for 3 beats by using the software package on an HP Sonos 2500. DeltaP(M) was also calculated with our formula. A linear regression model was used to compare the results of the measured versus the calculated DeltaP(M). The following sub-categories were also evaluated: transthoracic studies (TTE), transesophageal studies (TEE), native valve gradients (NV), prosthetic valve gradients (PV), sinus rhythm (SR), and atrial fibrillation (AF). The results of the regression analysis of the entire population of mean versus calculated DeltaP(M) are n = 41, r = 0.99, P

Volume

14

Issue

11

First Page

1107

Last Page

1111

ISSN

0894-7317

Disciplines

Medicine and Health Sciences

PubMedID

11696836

Department(s)

Department of Medicine, Cardiology Division

Document Type

Article

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