患者,男,34岁,因进行性肢体力弱3月加重伴心悸、气短一周住院。患者于3月前感觉四肢无力,抬头困难,逐渐发展至手不能持重物,抬臂费力,行走时易摔倒,近一周出现站立行走困难,伴胸闷、心慌、气短住院。入院查体:体形偏胖,慢性病容,双肺未闻及干湿啰音，心前区无隆起，心尖搏动无 Patients, male, 34 years old, due to progressive physical weakness March aggravated with palpitations, shortness of breath a week hospitalization. The patient felt limb weakness before 3 months and looked difficult, and gradually developed to the hand can not hold heavy objects, lifting arm effortlessly, walking easily fall, nearly a week standing walking difficulties, with chest tightness, palpitation, shortness of breath hospitalization. Admission examination: body overweight, chronic disease, lungs did not smell and wet and dry rales, no anterior bulging, apical beating