[Noninvasive diagnosis of mitral regurgitation by impedance cardiography].

A total of 46 patients with mitral regurgitation (MR) of varying degrees of manifestation and 84 subjects with no MR were investigated. The possibilities were elucidated of the MR diagnosis by the impedance index (IMR): the ratio of the primary diastolic wave O amplitude to the primary systolic wave amplitude (dz/dt)min of the impedance cardiogram. A significant increase of the IMR was recorded in the MR presence. The degree of such increase depended on the MR manifestation and not on the impairment of the left or right ventricle function. The high specificity and sensitivity of the method, the value of the negative and positive tests as well as their reproducibility evidence that impedance cardiography is a perspective method for the noninvasive diagnosis of MR.