１　临床资料患儿，男，９岁，体重２０ｋｇ。生后４个月发现心脏杂音，幼年时常有肺部感染史，活动耐力较同龄儿童低。血压１６／６ｋＰａ，股动脉枪击音和甲床毛细血管搏动均阳性，胸骨左缘第３、４、５肋间有２／６级收缩期杂音和舒张期叹息样杂音。胸部Ｘ线平片：双肺血增 1 Clinical data Children, male, 9 years old, weighing 20kg. 4 months after birth, heart murmur was found, childhood infections often have a history of pulmonary infection, activity endurance is lower than children of the same age. Blood pressure 16 / 6kPa, femoral artery gunshot wounds and nail bed capillaries were positive, sternal left margin 3,4,5 intercostal systolic 2/6 systolic and diastolic sighs. Chest X-ray: lung blood increased