0 the valve (= a structure that opens and closes) in the heart that stops blood from returning into the left atrium (= upper space) from the left ventricle (= lower space) -- 二尖瓣（心臟內部不斷開關的瓣膜結構，可阻止血液從左心室回流到左心房）
The diameter of the isthmus was found to be smaller, and the size of mitral valve annulus larger, than previously published values.
A tiny imperforate mitral valve and a rudimentary left ventricle were found.
Two years after surgery the child is clinically well, with no signs of pulmonary hypertension and with normal flow through the mitral valve.
It is generally acknowledged that the inflammatory process involves most frequently the mitral valve.
Congenital mitral valve disease associated with coarctation of the aorta.
The principal problem associated with repair of the mitral valve in children is long-term durability.
Echocardiography showed poor systolic function of her systemic (morphologically right) ventricle, and identified new severe regurgitation of her right-sided mitral valve.
The attachment extended to the left coronary leaflet of the aortic valve, and to the ventricular surface of the aortic leaflet of the mitral valve.
