[Echocardiographic evaluation of mitral stenosis: significance of Pc-To/Ac-Mo ratio (author's transl)].

The echocardiographic tracings of 40 subjects with pure or prevalent mitral stenosis are obtained. The modification of the isovolumetric relaxation time of the right (Pc-To) and the left (Ac-Mo) ventricle, measured from echocardiographic tracings, versus the values of systolic (PSP cat.) and wedge (PVCP cat.) pulmonary pressure are studied in 15 sinusal rhythm patients who underwent cardiac catheterization. The variations of Pc-To versus Ac-Mo and of Pc-To/Ac-Mo ratio versus the most important indices of mitral stenosis and right ventricular performance evaluation are studied in all the patients. Good correlation has been found between Pc-To and Ac-Mo ratio and PSP, PVCP, E-F, Wells index, Yigitbasi index, RICT/RVET, RPEP/RVET, mitral surface; poor correlation has been found between Pc-To/Ac-Mo ratio and left atrial dimension and stroke volume, while no-significant correlation has been found between this ratio and the ejection fraction, V cf, delta S%. For values of Pc-To/Ac-Mo ratio less than 1.20, 1.20 greater than and less than 1,50, greater than 1.50 the stenosis has been considered, respectively, mild, moderate and severe. The Pc-To/Ac-Mo ratio, obtained from echocardiographic tracings, is considered a useful index in the evaluation of the severity of the stenosis and of the pulmonary pressure variations in the presence of mitral stenosis.