强直性肌营养不良(Myotonic Dystrophy,DM)以肌强直、肌无力为重要临床特点,其跌倒症状未引起临床医生足够重视。本研究报道了1例无明显肌强直、肌无力,以跌倒发作为主诉的DM。1临床资料患者,男,36岁,因反复跌倒2年,于2012年6月21日就诊。无明显诱因突发跌倒,多则每天数次,少则每月1次,每次历时数秒,无意识障碍,很快自行站起并恢复正常,严重时可跌伤。曾就诊于多家医院,怀疑癫痫间、脑血管病等,反复 Myotonic dystrophy (Myotonic Dystrophy, DM) with myotonia, muscle weakness as the main clinical features, the fall symptoms did not cause clinicians enough attention. This study reported a case of no obvious myotonia, muscle weakness, to fall as the chief complaint of DM. 1 Clinical data Patients, male, 36 years old, fell repeatedly for 2 years, on June 21, 2012 treatment. No obvious cause of sudden fall, as many times a day, ranging from once a month, each time lasted for a few seconds, unconsciousness, quickly stood up and returned to normal, may fall serious. Have visited a number of hospitals, suspected epilepsy, cerebrovascular disease, repeated