Cohen M V
Am Heart J. 1976 Feb;91(2):168-77. doi: 10.1016/s0002-8703(76)80571-6.
Ten per cent of all patients referred to the echocardiography laboratory for diagnostic evaluation had mitral valve prolapse. Of these 35 patients, 19 (54 per cent) had prolapse of both the anterior and posterior mitral leaflets. Of the 19 patients, 13 had Type A or midsystolic prolapse, whereas six had Type B or pansystolic prolapse of the mitral leaflets. Simultaneous phonocardiographic examination of the patients revealed either midsystolic click and late systolic murmur, pansystolic murmur, or isolated click and short systolic murmur. There was no apparent correlation between the echocardiographic prolapse pattern and the auscultatory events. One patient with Type A prolapse had no auscultatory abnormalities at the time of the examination. It is suggested that the abnormal sounds may be generated by a redundant mitral leaflet rather than chordae tendineae.
在被转诊至超声心动图实验室进行诊断评估的所有患者中，10%患有二尖瓣脱垂。在这35例患者中，19例（54%）二尖瓣前后叶均有脱垂。在这19例患者中，13例为A型或收缩中期脱垂，而6例为B型或二尖瓣叶全收缩期脱垂。对这些患者同时进行的心音图检查显示有收缩中期喀喇音和收缩晚期杂音、全收缩期杂音，或单独的喀喇音和短暂收缩期杂音。超声心动图脱垂模式与听诊事件之间无明显相关性。1例A型脱垂患者在检查时无听诊异常。提示异常声音可能由多余的二尖瓣叶而非腱索产生。
