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双胎宫口早期扩张和较高的早产率,提供自然机会研究性交与早产的关系。性交的机械性刺激使暴露的胎膜释放前列腺素(PG),附着在宫颈或胎膜上的精液 PG 作用及上行感染或三者联合将促进已扩张的宫颈发动分娩。本文旨在对双胎孕妇性交次数与早产间的关系进行前瞻性研究。对126名孕7个月无严重合并症的双胎孕妇询问孕期性交次数,除1例孕期不详,另1例于孕35周时行剖宫产外,余124名分娩时经下述方法估计孕龄;孕24周前 B 超图象(8例)、新生儿 Dubo-
Twin pregnancies early expansion and higher rates of preterm delivery provide a natural opportunity to study the relationship between sexual intercourse and premature delivery. Mechanical stimulation of sexual intercourse causes exposure of the membranes to release prostaglandin (PG), attachment of sperm PG to the cervix or membranes, ascending infection, or a combination of the three to promote expanded cervical mobilization. The purpose of this article is to prospectively study the relationship between the number of pregnant women with twin pregnancies and preterm birth. Twelve pregnant women who did not have serious complications during pregnancy were asked about the number of intercourse during pregnancy. Except for 1 case of unknown pregnancy and 1 case of cesarean at 35 weeks of gestation, 124 pregnant women were estimated their gestational age by the following methods ; 24 weeks before pregnancy B ultrasound images (8 cases), neonatal Dubo-