肩难产确是一种产科急症,对母婴有高度危险。然而,在胎头娩出前尚无一种确切可靠的指征预示此种产科情况。本文通过对照研究介绍与肩难产有关的各种危险因素并加以分析。作者选择73例肩难产及146例对照病例进行研究。每例肩难产与2例对照病例对应分析。资料来自医院记录,并按计算机标准分析程序,二者选择程序相同。分析结果表明,肩难产是一种巨大儿分娩的并发症,其发生率随出生体重的增加而明显增加。婴儿体重<4,000g 或9lbs,其发生率大约是1/333 Shoulder dystocia is indeed a maternity emergency that is highly dangerous to mothers and babies. However, there is no definitive and reliable indication of the obstetrical condition before the first delivery. This article describes and analyzes various risk factors associated with shoulder dystocia through controlled studies. The authors selected 73 cases of shoulder dystocia and 146 cases of control study. Each shoulder dystocia and two cases of control corresponding analysis. Data from the hospital records, and according to computer standard analysis program, the same choice between the two programs. The results show that shoulder dystocia is a complication of childbirth, the incidence of birth weight increased significantly. Infants weighing <4,000 g or 9 lbs have an incidence of approximately 1 in 333