Thompson S A, Lyons T L, Makowski E L
J Reprod Med. 1987 May;32(5):328-39.
A retrospective study was undertaken of 341 twin pregnancies over a ten-year period at the University of Colorado Health Sciences Center. The perinatal morbidity and mortality were higher than for singleton gestations, but no difference was found between the first and second twins. Bed rest was effective in prolonging gestation and decreasing perinatal mortality (P less than .05). Delivery of the second twin in noncephalic presentation was accomplished vaginally in 46.5%, with external version successful in five of six attempts. The interval between the birth of each twin did not affect outcome.
科罗拉多大学健康科学中心对10年间的341例双胎妊娠进行了一项回顾性研究。围产期发病率和死亡率高于单胎妊娠，但第一和第二胎之间未发现差异。卧床休息在延长孕周和降低围产期死亡率方面有效（P<0.05）。46.5%的非头位第二胎经阴道分娩，6次外倒转术中5次成功。每对双胞胎出生的间隔时间不影响结局。
