[Quantitative analysis of the phonocardiogram configuration for determining the degree of aortic regurgitation in patients with combined acquired heart defects]. / Kolichestvennyi analiz konfiguratsii fonokardiogrammy dlia opredeleniia stepeni aortal'noi regurgitatsii u bol'nykh sochetannymi porokami serdtsa.

A phonocardiographic index for determining the presence and severity of aortic regurgitation in patients with complex combined valvular diseases is suggested. This index comprises the relation between the amplitudes of the early diastolic murmur and the second sound and the relation between the maximum oscillations in early and late systole. The first two parameters are measured from a phonocardiogram recorded from the site where the early diastolic murmur is registered best(left third or fourth intercostal space at the sternum), the last from the site where the systolic murmur of aortic origin is recorded best (right second intercostal space). The differences in the value of the index between 4 groups of patients with different degree of aortic regurgitation are statistically significant (p less than 0.05). The index makes it possible to distribute according to the phonocardiogram all patients into 4 groups with 17% classification error and 2 groups of practical importance (with and without marked regurgitation) with 5% error.