Circulation, Vol 51, 827-831, Copyright © 1975 by American Heart Association
WL Henry, JM Griffith, LL Michaelis, CL McIntosh, AG Morrow and SE Epstein
A quantitative assessment of mitral valve orifice area can be achieved in
patients with pure mitral stenosis by cardiac catheterization. In the
presence of mitral regurgitation, however, accurate measurement often is
impossible because total diastolic flow through the mitral valve frequently
is unknow. Using a recently developed real-time, two- dimensional
echocardiography system, we are able to obtain cross- sectional images of
the mitral valve by scanning the heart perpendicular to its long axis at
the level of the tip of the mitral leaflets. Twenty consecutive patients
undergoing operation for mitral valve disease were studied during the week
prior to operation. In 18 of 20 (90%) the mitral orifice was imaged
successfully in early diastole by two-dimensional echocardiography so that
mitral valve orifice area could be measured directly in square centimeters.
In 14 patients (ten with associated mitral regurgitation), mitral orifice
area was measured both by echocardiography and directly at time of
operation. In 12 of 14 (86%) patients, mitral orifice area by
two-dimensional echocardiography was within 0.3 square centimeters of that
measured at operation (correlation coefficient for all 14 patients equals
0.92). We conclude that two-dimensional echocardiography is extremely
useful in the evaluation of patients with mitral valve disease because it
provides a noninvasive method for directly measuring the mitral valve
orifice area that is accurate even in the presence of mitral regurgitation.
ARTICLES
Measurement of mitral orifice area in patients with mitral valve disease by real-time, two-dimensional echocardiography
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