Quantitative assessment of mitral valve apparatus before and after mitral valve surgery by real-time three-dimentional echocardiography / 临床儿科杂志

ABSTRACT

Objectives To evaluate the mechanism of mitral regurgitation after mitral valve surgery by quantitative assessment of mitral valve three-dimensional parameters using real-time three-dimensional echocardiography (RT-3DE). Me-thods According to the improved degree of mitral regurgitation (MR), 30 children were divided into two groups after mitral valve repair:MR improved (I) group and residual MR (II) group. And the pre-operative 3-DE parameters were compared with post-operative parameters in two groups respectively. Results In group I, three dimensional parameters, including mitral valve annular area in end-systole and end-dilate (AA1, AA2), PM papillary muscle annular distance (AL-A), AL papillary muscle annular distance (PM-A), inter-papillary distance (PM-AL), the anterior leaflet and posterior leaflet tethering angles (a1, a2, argAL-C-PM), left ventricular volume end-systole and end-dilate (LVEDV, LVESV) were significantly improved after surgery (P0.05). Conclusions Most of the mitral valve parameters were much better in group I after surgery. However, the malformation of papillary appa-ratus, leaflet tethering strength and left ventricular function were unchanged in group II, which may be the key mechanism of mitral regurgitation after surgery.