Effects of Left Ventricular Systolic Function on Left Ventricular Diastolic Filling Patterns in Severe Mitral Regurgitation

Abstract

Significant mitral regurgitation (MR) may alter the normal pattern of Doppler detected left ventricular (LV) filling by causing a prominent early filling (E) wave velocity. The manner and extent to which the typical filling pattern of uncomplicated MR is affected by concomitant impaired LV systolic function has not been characterized. Twenty patients with severe LV systolic dysfunction (2-dimensional echocardiographic estimation of ejection fraction ≤30%) and 21 age- and sex-matched case controls with normal systolic function (ejection fraction ≥55%) were selected. In addition, 20 subjects with normal LV systolic function and no MR were analyzed as a reference group. Maximal E-wave velocity was increased and highest among MR patients with preserved LV systolic function (124 ± 37 cm/s) than among those with LV systolic dysfunction (101 ± 25 cm/s; p <0.05) and normal controls (74 ± 18 cm/s; p <0.001). Concurrently, A-wave velocity was lowest in patients with systolic dysfunction and MR (47 ± 23 cm/s; p <0.001) than in patients with normal systolic function and MR (79 ± 33 cm/s) and normal controls (74 ± 20 cm/s). Deceleration time of the E wave was longest among those with normal systolic function and MR (203 ± 41 ms) than among those with systolic dysfunction and MR (152 ± 35 ms; p <0.001) and normal controls (167 ± 53 ms; p <0.05). Thus, systolic LV dysfunction in patients with severe MR, compared to patients with MR and normal LV systolic function, is associated with important changes in diastolic inflow velocities, including reduction of the maximal A-wave velocity to a greater extent than the E wave, resulting in an increased E/A ratio and shortening of deceleration time of the E wave.Forty-one patients with severe mitral regurgitation by color Doppler were selected (21 with normal left ventricular (LV) function and 20 with severe LV dysfunction) and 20 subjects with normal LV systolic function and no mitral regurgitation were analyzed as a reference group by echocardiography. Systolic dysfunction of the left ventricle in patients with severe mitral regurgitation is associated with important changes in diastolic inflow velocities that include reduction of the maximal A-wave velocity to a greater extent than the E wave, resulting in an increased E/A ratio and shortening of deceleration time of the E wave.