Why the study?
Does a new hydraulic orifice formula applied to M-mode echocardiography accurately measure mitral valve area compared to cardiac catheterisation in patients with mitral stenosis?
Does a new hydraulic orifice formula applied to M-mode echocardiography accurately measure mitral valve area compared to cardiac catheterisation in patients with mitral stenosis?
A new hydraulic orifice formula allows for accurate quantitative assessment of mitral valve area in stenosis using M-mode echocardiography, correlating well with invasive catheterization.
Supports M-mode echocardiography for mitral stenosis assessment; leaves open prospective validation versus catheterization.
A mitral valve orifice equation has been formulated which allows the computation of mitral valve area (A) from the echographically measurable variables of stroke volume (SV) and diastolic filling period (DFP) in seconds per minute by the formula, A=21 (SV)/(DFP)2. Mitral valve areas computed from M-mode echographic measurements are shown to correlate with areas computed by the Gorlin formula (r-0.90) for resting state conditions of predominant mitral stenosis of clinical grades 2 to 4. The results suggest that, in the absence of wall motion irregularities, M-mode echocardiography can quantitatively assess the mitral valve area in stenosis.
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Seitz et al. (1981) studied this question.
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