患儿女性 ,１２岁 ,因胸闷１０余天 ,伴气促６天于１９９８年１１月２０日入院。患儿于入院前１０余天在无明显诱因下觉胸闷 ,当时未注意。入院前６天觉气促 ,活动后加剧。无发热 ,无咳嗽、咯血史 ,无胸痛史 ,无关节酸痛、皮疹史。近日尿量略减少 ,无浮肿 ,尚能平卧。体检 :Ｔ? Children with children, 12 years old, more than 10 days due to chest tightness, with shortness of breath 6 days in November 20, 1998 admission. Children in the hospital more than 10 days without obvious incentive to feel chest tightness, did not pay attention. Six days before admission, the patient is feeling good and exacerbated after the activity. No fever, no cough, hemoptysis history, no history of chest pain, no joint soreness, rash history. Recently a slight decrease in urine output, no edema, still able to lie down. Physical examination: T?