本文对35例出生体重在1000～1500g之间,患呼吸窘迫综合征(RDS),需用呼吸机和吸入氧气浓度在40％或更高的婴儿进行随机分组研究,出生8小时内在气管内给予牛肺表面活性剂(100mg/kg),为治疗组(15例);气管内给予生理盐水(1.5ml)为对照组(20例),分别在治疗前和治疗后24小时摄X线胸片,并由专门的放射科医生在不了解分组的情况下对这些胸片进行阅读。首先对每张胸片进行评分:包括肺的充气程度、肺的密度和支气管充气的程 In this study, 35 children with a birth weight of 1000-1500 g at birth who had respiratory distress syndrome (RDS) were randomized to receive either a ventilator or an inhaled oxygen concentration of 40% or more in infants who were administered intratracheally within 8 hours of birth Bovine pulmonary surfactant (100mg / kg) was used in the treatment group (15 cases); saline (1.5ml) was given intratracheally as the control group (20 cases) , And these radiographs were read by specialized radiologists without knowing the grouping. Each chest radiograph is first scored: including the degree of lung inflation, the density of the lung, and the course of bronchial inflation