Department of Obstetrics and Gynaecology, Hangzhou Women's Hospital, Hangzhou, Zhejiang, China.
Sci Rep. 2017 Aug 1;7(1):7067. doi: 10.1038/s41598-017-07722-7.
Observational studies have demonstrated that placental cord drainage can shorten the length of the third stage of labour and reduce blood loss during vaginal deliveries. The aim of our work was to evaluate the existing evidence for the effectiveness of placental cord drainage in the third stage of labour. PubMed, Embase, the Cochrane Library, Web of Science, Google Scholar and 50 journals were searched up to the 4th of June, 2017. Randomized controlled trials comparing placental cord drainage with no cord drainage in the third stage of labour during vaginal delivery were included. Nine studies with 2653 participants were included. Compared with clamping the umbilical cord, umbilical cord drainage during the third stage of labour shortened the third-stage duration by 2.28 minutes (95% confidence interval (CI), -3.22 to -1.33), but did not reduce the amount of blood loss (-31.99 mL, -86.08 to 22.09). For women with normal vaginal deliveries, the incidence of postpartum haemorrhage was reduced by 3%. Placental cord drainage is a simple and non-invasive procedure that should be considered after delayed cord clamping. Further studies about the physiological processes and effects of placental cord drainage in additional circumstances are needed.
观察性研究表明，胎盘脐带引流可以缩短第三产程的时间，并减少阴道分娩时的出血量。我们的工作旨在评估胎盘脐带引流在第三产程中的有效性的现有证据。我们检索了 PubMed、Embase、Cochrane 图书馆、Web of Science、Google Scholar 和 50 种期刊，检索时间截至 2017 年 6 月 4 日。我们纳入了比较胎盘脐带引流与阴道分娩第三产程不进行脐带引流的随机对照试验。纳入了 9 项研究，共 2653 名参与者。与夹闭脐带相比，第三产程中进行脐带引流可使第三产程缩短 2.28 分钟（95%置信区间，-3.22 至-1.33），但不会减少出血量（-31.99 毫升，-86.08 至 22.09）。对于正常阴道分娩的妇女，产后出血的发生率降低了 3%。胎盘脐带引流是一种简单、非侵入性的操作，应在延迟夹闭脐带后考虑。需要进一步研究胎盘脐带引流在其他情况下的生理过程和效果。
