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1病例报告患者，男性，42岁。反复发作胸闷、气急、乏力、晕厥，以肥厚性心肌病入院。体检：胸骨左缘3～4肋间可闻及收缩期杂音Ⅲ级，音粗糙，抬腿、下蹲时杂音减轻，心电图示左室肥大伴劳损。超声心动图示室间隔增厚为31mm。与左室后壁厚度比为2．6：1。二尖瓣前叶呈SAM现象（
1 case report patient, male, 42 years old. Repeated chest tightness, shortness of breath, fatigue, fainting, to hypertrophic cardiomyopathy admission. Physical examination: 3 to 4 intercostal sternum can be heard on the left edge of the sternum and systolic murmur Ⅲ grade, rough sound, leg lift, squatting noise reduction, ECG left ventricular hypertrophy with strain. Echocardiography showed ventricular septal thickening of 31mm. And left ventricular posterior wall thickness ratio of 2.6: 1. Mitral anterior leaf was SAM phenomenon (