The factors that relate to premature rupture of membrane at full term delivery

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  • 正期産における前期破水に関わる要因

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Purpose<br>To clarify the factors related to premature rupture of membranes at full term delivery.<br>Methods<br>This retrospective study at a maternity hospital and midwifery home used antepartum and intrapartum records and chose women who had full term delivery.<br>Firstly we clarified relations each variable number and premature rupture of membranes, and finally we analyzed using binomial logistic regression analysis (step-up procedure) with the level of statistical significance set at two-sided 5%.<br>The Research Ethics Committee at St.Luke's International University approved this study.<br>Results<br>A total of 610 parturients (310 at maternity hospital and 300 at midwifery home) who gave birth from August 2010 through October 2012 cases were reviewed. The average age was 31.46 years, and there were 30% primipara and 70% multipara. Of those 20% experienced premature rupture of membranes.<br>There were Eight Factors (primipara, body mass index, parity, birthweight, sexual transmitted infection, doing a pelvic exam at preterm, doing a pelvic exam at full term and research settings) associated with premature rupture, and 474 parturient’s data were drawn by excluding each missing value. Significant factors associated with premature rupture were: primipara (OR=2.145, 95%CI: 1.308-3.519, p=.003), and sexual transmitted infection limited to multipara (OR=3.129, 95%CI: 1.378-7.015, p=.006). Doing a pelvic exam at full term (OR=1.837, 95%CI: 0.998-3.383, p=.050) have a relatively strong association with premature rupture.<br>Conclusion<br>Factors that relate to premature rupture of membrane at full term delivery were: primipara, doing a pelvic exam at full term it was slightly below a level of significance and sexual transmitted infection limited to multipara. It is necessary for women to learn primary prophylaxis for sexual transmitted infections and the risk factors for premature rupture of membranes, before getting pregnant. Midwives should discuss about the risks and benefits of conducting a pelvic exam at full term and gain clarity about indications to proceed.

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