Methods According to the symptoms and signs, results of chest radiograph and doppler ultrasonic echocardiograph, 100 cases of MAS were divided into 5 clinical types.

• 方法对100例MAS患儿临床资料进行回顾性分析，根据临床症状、体征及辅助检查结果，将MAS患儿分为五种临床类型；