心脏二尖瓣环立体形态的研究

A STUDY ON THE STEREO-SHAPE OF MITRAL ANNULUS

三维超声心动图的最近研究表明,二尖瓣环在收缩末期为非平面的“马鞍”形.为探索二尖瓣环立体形态的解剖学基础.作者对15个固定心脏标本和12个新鲜心脏标本的二尖瓣环的立体形态进行了定性和定量的观察.结果发现固定心脏的二尖瓣环为非平面的“马鞍”形,前瓣环距心尖部较远,前、后瓣环平面之间的夹角为130.93±8.46度.纵形剖开新鲜心脏的左心室,发现二尖瓣环不成一直线,两纤维体之间的瓣环呈一弧形凸向主动脉,该弧形的高度为0.43±0.15cm.

Recent studies have shown that the mitral annulus appears as a nonplanar saddle shape at one point in late systole by three-dimensional echocardiography. In order to research the anatomical stereo-shape of the mitral annulus, we observed 15 fixed and 12 nonfixed human heart specimens qualitatively and quantitativly. The mitral annulus of all the fixed specimens showed a nonplanar 'saddle' shape. The anterior aortic attachment was farthest from the apex. The mean angle between the anterior aortic and posterior attachments of the mitral annulus was 130.93 ±8.46 degrees. Nonfixed speciments were dissected through the middle of the posterior attachment logitudinally. We found that the mitral annulus of all the speciments was out of a straight line. The annulus between the two fibro-bodies was presistently convex towards the aorta. The highest point of this part above the two fibro-bodies was 0.43±.15 cm on average.