Nagata S
National Cardiovascular Center, Suita 565.
J Cardiogr Suppl. 1986(11):81-6.
In recent years, echocardiography has become the standard method of diagnosing mitral valve prolapse. There is a few criteria of diagnosing mitral valve prolapse with two-dimensional echocardiography. In general, the definition of mitral valve prolapse with two-dimensional echocardiography is the motion of a bodily part of the anterior or posterior mitral leaflet superior to the annulus during systole. However, the patients with characteristic phonocardiographic findings of mitral valve prolapse were overlooked by the currently used criteria. I proposed, therefore, an essentially different two-dimensional echocardiographic criterion of diagnosing mitral valve prolapse. The criterion included the systolic dislocation of the anterior and posterior mitral leaflets at the coaptation zone in the parasternal long-axis view. This diagnostic criterion enabled us to obtain a systematic view of the mitral valve abnormality. Quantitation of mitral valve prolapse is necessary to evaluate the severity of the mitral regurgitation and the degree of mitral valve lesion. The grade of severity of mitral valve prolapse was assessed by measuring the distance of dislocation between the anterior and posterior leaflets at the area of coaptation. Analyzed data using this method showed that the degree and extent of mitral valve prolapse increased with age.
近年来，超声心动图已成为诊断二尖瓣脱垂的标准方法。二维超声心动图诊断二尖瓣脱垂有一些标准。一般来说，二维超声心动图诊断二尖瓣脱垂的定义是在收缩期二尖瓣前叶或后叶的某一部分运动超过瓣环。然而，目前使用的标准忽略了具有二尖瓣脱垂特征性心音图表现的患者。因此，我提出了一种本质上不同的二维超声心动图诊断二尖瓣脱垂的标准。该标准包括在胸骨旁长轴视图中二尖瓣前后叶在瓣叶闭合区的收缩期移位。这个诊断标准使我们能够对二尖瓣异常有一个系统的认识。二尖瓣脱垂的定量对于评估二尖瓣反流的严重程度和二尖瓣病变的程度是必要的。通过测量瓣叶闭合区前后叶之间的移位距离来评估二尖瓣脱垂的严重程度分级。使用这种方法分析的数据表明，二尖瓣脱垂的程度和范围随年龄增加而增加。
