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患儿 男,13岁。主因自幼发现心脏杂音伴活动后心悸,气促而入院。查体:心尖搏动弥散,最强点位于左第5肋间锁骨中线。胸骨左缘第3、4肋间可扪及粗糙的收缩期震颤。心率84次/分,律整,胸骨左缘第3、4肋间闻及4～5/Ⅵ收缩期吹风样杂音,P_2减弱,P_21。超声心电
The boy is 13 years old. The main reason for this was that he was admitted to hospital because he was found to have heart palpitations and heart palpitations after activity. Physical examination: Apex beats disperses, and the strongest point lies in the left fifth intercostal clavicle midline. The 3rd and 4th intercostal space on the left sternal border can be paralyzed and rough systolic tremor. The heart rate was 84 beats/min., and the left and right sides of the sternum were heard on the third and fourth intercostal spaces, and the hairy murmurs on the 4th to 5th/VI systolic phase were attenuated, P_2 was weakened, P_21. Ultrasound ECG