Rydhstroem H
Department of Obstetrics and Gynecology, University Hospital, Lund, Sweden.
Am J Obstet Gynecol. 1998 Jan;178(1 Pt 1):136-9. doi: 10.1016/s0002-9378(98)70640-4.
This was a population-based medical birth registry investigation designed to study whether a preterm twin delivery portends a shorter gestation in a subsequent pregnancy.
Data on all pregnancies and deliveries from 1973 to 1993 inclusive, stored at the Medical Birth Registry, the National Board of Health and Welfare, Stockholm, were analyzed. Information on gestational duration, estimated during pregnancy with or without ultrasonography in the second trimester, was analyzed for 2979 twin births followed by a singleton delivery.
Gestation for women with a singleton pregnancy after a preterm twin birth in the twenty-eighth to thirty-sixth gestational week lasted about 39 +/- 0.5 weeks (mean +/- SEM). When the twin birth had taken place at term (37 to 42 weeks) the corresponding singleton gestation lasted about a week longer. When the twin birth occurred in gestational weeks 28 to 30, 31 to 33, or 34 to 36, the corresponding proportions of women who gave birth earlier than 37 weeks (20 to 27 weeks, only live births) in the subsequent singleton pregnancy were 9.8%, 7.0%, and 5.8%, respectively (chi 2 = 3.4, p > 0.05).
It would appear that a preterm twin birth does not to any significant extent affect the gestational duration of a subsequent singleton pregnancy.
这是一项基于人群的医学出生登记调查，旨在研究早产双胎分娩是否预示着随后妊娠的妊娠期较短。
分析了1973年至1993年（含）期间存储在斯德哥尔摩国家卫生和福利委员会医学出生登记处的所有妊娠和分娩数据。对2979例双胎分娩后单胎分娩的妊娠持续时间信息进行了分析，妊娠持续时间在孕期通过或不通过孕中期超声检查进行估算。
在第28至36孕周早产双胎后单胎妊娠的妇女，妊娠期约为39±0.5周（均值±标准误）。当双胎足月分娩（37至42周）时，相应的单胎妊娠期长约一周。当双胎分娩发生在第28至30、31至33或34至36孕周时，在随后单胎妊娠中早于37周分娩（20至27周，仅活产）的妇女相应比例分别为9.8%、7.0%和5.8%（χ² = 3.4，p>0.05）。
早产双胎似乎在很大程度上不会影响随后单胎妊娠的妊娠期。
