Comparison of left ventricular diastolic parameters between patients with and without significant mitral regurgitation.

Mitral regurgitation (MR) can affect left ventricular diastolic parameters because of interference with regurgitation flow. This study compared left ventricular diastolic parameters between patients with and without significant MR. The MR group included 57 consecutive patients with significant MR. Fifty-seven age-, sex- and Tei index-matched patients without significant MR were selected as the reference group. Baseline characteristics and Tei index and its components were comparable between the MR and reference groups. The MR group had higher left atrial volume index, transmitral E wave velocity (E), ratio of E to transmitral A wave velocity, early diastolic mitral annular velocity (Ea), E/Ea, and ratio of E to isovolumic relaxation flow propagation velocity (IRFPV) (p ≤ 0.025), and lower E-wave deceleration time (p = 0.019) and late diastolic mitral annular velocity (p < 0.001). However, the two groups had similar IRFPV (p = 0.844). In conclusion, MR apparently affects E and Ea, but not IRFPV. IRFPV could potentially be a reliable relaxation parameter in patients with significant MR, but further confirmation by invasive studies is needed.