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用实时超声心脏断层和M型技术研究了80例已排除继发于其它已知疾病的二尖瓣脱垂患者。左室长轴扇形扫描的观察对诊断二尖瓣脱垂是有用的和敏感的。借助于UCT和M型技术的对照研究,全收缩期“弓形”、收缩中期“吊床样”改变以及多层回声等被称为“脱垂图象”的声学来源和产生机理得到了解释。全收缩期“弓形”和收缩中期“吊床样”改变被认为是诊断二尖瓣前叶脱垂的可靠征象,而无助于诊断二尖瓣后叶脱垂,后叶脱垂需要UCT探查。根据UCT上脱垂的表现,将二尖瓣脱垂按程度进行分类,以Am Pn表示其度数。A和P分别代表前叶和后叶脱垂,m和n表示等级,共分为0—5级。
Eighty patients with mitral valve prolapse secondary to other known diseases were studied using real-time echocardiographic and M-type techniques. Observation of left ventricular long axis scans is useful and sensitive in the diagnosis of mitral valve prolapse. The acoustic sources and mechanisms of production, known as “prolapse images,” are explained by means of comparative studies of UCT and M techniques, “systolic” systolic, “hammock-like” changes in the mid-systolic and multilayered echoes. Totally systolic “bow” and mid-contractile “hammock-like” changes are considered reliable for the diagnosis of anterior mitral valve prolapse and do not help diagnose mitral valve prolapse. Posterior lobe prolapse requires UCT exploration. According to the performance of prolapse on the UCT, mitral valve prolapse according to the degree of classification, to Am Pn said its degree. A and P, respectively, anterior and posterior lobe prolapse, m and n that level, is divided into 0-5 level.