男,8个月。第4胎,足月顺产,因发育迟缓、喂养困难就诊。生后4个月增添牛乳后,明显表现吸吮费力,常吸吸仃仃,气急、多汗,逐渐消瘦,经常发热。营养差,体重6.5kg,不能独坐、扶坐时脊柱后突,竖头无力,方颅,囟门大,无紫绀,桶状胸,心界向左扩大,心率160/分,心音有力,无杂音。肝脾不大。超声心动图:左房室增大,房室间隔延续无中断,左 Male, 8 months. The fourth child, term full-term, due to stunting, feeding difficulties treatment. 4 months after birth, added milk, obviously sucking effort, often sucking Ding Ding, shortness of breath, sweating, and gradually thin, often fever. Poor nutrition, body weight 6.5kg, can not sit alone, when sitting on the spine kyphosis, vertical head weakness, square skull, fontanelle, no cyanosis, barrel chest, heart left to expand, heart rate 160 / min, strong heart sounds, no Noise. Small spleen and liver. Echocardiography: Left atrioventricular anastomosis, atrioventricular septal continuation without interruption, left