临床病程和监别诊断Duchenne型肌营养不良症(简称DMD)是男性最常见的性连锁的致命性疾病。所有DMD患者的临床经过都是非常相似的,至少到他们变为不能走路的年龄,即9～12岁左右时是这样。如果仔细地观察,可能在1岁或2岁期间症状就已经明显。多数受累儿童有运动肌发育延迟,约有一半的患儿在18个月前不会走路,后来有趋向跌倒的特殊摇摆步态。这些患者爬楼梯困难,从地板 Clinical course and differential diagnosis Duchenne muscular dystrophy (DMD) is the most common male sexually transmitted killer disease. The clinical course of all patients with DMD is very similar, at least until they become unable to walk the age of 9 to 12 years old or so. If carefully observed, the symptoms may be significant at 1 year or 2 years of age. Most affected children have delayed motor muscle development, and about half do not walk 18 months ago, followed by a special swing gait that tends to fall. These patients have difficulty climbing the stairs from the floor