患儿，女，14岁，咳嗽2周，发热伴胸痛2天于1985年10月入院。入院前2周因受凉后轻咳。入院前2天发热，左胸痛，系持续隐痛能忍，不放射，活动后乏力、心累、食欲稍减。入院前1周学校体检发现心脏收缩期杂音。平素体健。入院体检：体温38.1℃，呼吸平稳，唇周不发绀，咽充血，扁桃体Ⅰ°肿大。双肺无异常。心率114次/分，心律齐，心尖闻及收缩期Ⅱ级杂音，未闻及心包摩擦音。肝肋下1cm。Hb 120g/L，白细胞10.4×10~9/L，N0.67，L0.30，E0.03。胸部X线片正常。心电图正常。心音图心尖区收缩早中期杂音，第三心音。超声心动图、M超和扇形超均报告二尖瓣前叶轻度脱垂。诊断：（1）原发性二尖瓣脱垂；（2）上 Children, women, 14 years old, cough 2 weeks, fever with chest pain 2 days in October 1985 admitted. 2 weeks before admission due to cold cough. 2 days before admission fever, left chest pain, Department of continuous pain can endure, no radiation, fatigue after exercise, tired heart, appetite reduced. One week before admission, school examination revealed systolic murmur. Usually physical health. Admission examination: body temperature 38.1 ℃, stable breathing, cyanosis of the lip, pharyngeal congestion, tonsil I ° enlargement. No abnormal lungs. Heart rate 114 beats / min, heart rate Qi, apical hearing and systolic Ⅱ level murmur, no smell and pericardial frictional sound. Liver ribs 1cm. Hb 120g / L, white blood cells 10.4 × 10 ~ 9 / L, N0.67, L0.30, E0.03. Chest X-ray film normal. Normal ECG. Phonocardiogram apex contractions mid-early murmur, the third heart sound. Echocardiography, M-ultrasonography and fan-shaped ultra-mild mitral valve prolapse were reported. Diagnosis: (1) primary mitral valve prolapse; (2) on