Why the study?
Does a modified equalization rate formula provide dimensions that relate directly to mitral valve area in patients with mitral stenosis?
Does a modified equalization rate formula provide dimensions that relate directly to mitral valve area in patients with mitral stenosis?
A modified haemodynamic formula (equalization rate) was developed to directly estimate mitral valve area in mitral stenosis.
May facilitate direct mitral valve area estimation in mitral stenosis; extends prior formula with larger series but remains hypothesis-generating.
The presently accepted methods for the estimation of the diastolic area of the mitral orifice have been based on either the pressure gradient (Gorlin and Gorlin, 1951) or the contour of the left atrial pressure pulse (Marshall, Woodward, and Wood, 1958). In 1961 a formula was presented in which we attempted to combine the two methods (Gunnar et al., 1961); however, the calculations had the disadvantage of producing a nondescript number which appeared to be proportional to the size of the mitral orifice as found at operation or necropsy but was without dimensions. We have now enlarged our series and modified the formula to provide dimensions which relate directly to the valve area, and the results of the analysis of this method comprise the basis of this report.
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Gunnar et al. (1965) studied this question.
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