患儿 ,男 ,5个月。因发烧 1天入院。体检 :T 39.1℃ ,精神稍萎靡 ,呼吸平稳。胸廓无畸形 ,双肺呼吸音粗 ,未闻及干湿性罗音 ,心率 1 4 0次 /分 ,律不齐 ,心前区闻及 II级收缩期杂音。心电图示 :频发房早伴结性逸搏 ,阵发性房性心动过速。超声心动图检查 :左房左室稍增大 ,右房 Children, male, 5 months. 1 day due to fever admission. Physical examination: T 39.1 ℃, slightly depressed spirit, breathing steady. Thoracic non-deformity, lung breath sounds rough, unheard-of and wet and dry rales, heart rate 140 beats / min, irregularities, precordial area and II systolic murmur. ECG shows: frequent room early with complication Yat stroke, paroxysmal atrial tachycardia. Echocardiography: left atrial slightly increased left atrium, right atrium