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分娩后子宫的复旧是在生理机制的控制下,使重1000g的妊娠子宫,通过子宫肌细胞的自溶变化而逐渐萎缩,在几周内恢复正常大小(40～60g)。产后子宫复旧的过程中,如加杂了某些影响子宫复旧的因素,如蜕膜剥离不全,胎盘部分残留,子宫内膜炎,子宫位置不正影响血液循环,子宫肌瘤以及产后休息不足等,都是子宫复旧不全的病因。剖宫产分娩者,则由于手术的干扰,增加了出血、感染的机会。如子宫切口部位选择不当,缝合技术不良及缝线等异物的残留,更增加了子宫复旧不全的因素。因此,剖宫产术后子宫复旧不全,子宫切口愈合不良为晚期产后出血的主要病因。
After the delivery of uterine involution is under the control of the physiological mechanism, so that weight 1000g of the pregnant uterus, uterine muscle cells by autolytic changes and gradually shrink, within a few weeks to restore normal size (40 ~ 60g). Postpartum uterine involution of the old process, such as the mixed with some of the factors affecting the uterine involution, such as decidual exfoliation, placental residue, endometritis, uterine position does not affect the blood circulation, uterine fibroids and postpartum rest and lack of, Are the cause of incomplete uterine involution. Cesarean section delivery, due to surgical interference, increased bleeding, infection opportunities. Such as improper choice of uterine incision site, poor suture technique and suture and other foreign body residues, but also increase the uterine involution of the factors. Therefore, cesarean section uterine involution incomplete uterine incision hemorrhage is the leading cause of postpartum hemorrhage.