患者男，6岁。因心悸1＋月入院。患者在院外因心悸多次就诊，发作时心电图示心房纤颤或频发房性早搏伴短阵房速，心肺正常。在院外一直按“冠心病”治疗，但症状无缓解，心房纤国，窦性心律交替出现。既往无慢性咳嗽，咯疾病史。查体：右肺呼吸音稍低，心界不大，心率lin次／分 Male patient, 6 years old. Because of heart palpitations 1 month admitted. The patient experienced multiple palpitations outside the hospital because of episodes of atrial fibrillation or frequent atrial premature beats with paroxysmal atrial tachycardia and normal heart and lung. Outside the hospital has been treated with “coronary heart disease”, but the symptoms are not relieved, atrial fibrosis, sinus rhythm appear alternately. There was no history of chronic cough and sputum disease. Physical examination: The right lung breath sounds slightly lower, the heart is not big, heart rate lin times/min