分娩发作的机制尚不完全清楚,虽然有了许多理论,但无一理论获得圆满论证。Reynold认为许多逐渐加速变化的控制因子达到失去平衡的极限时间,分娩即发作。目前多认为分娩的发作,主要是子宫收缩和调节机制的平衡关系改变所引起。这些调节因子包括:1.子宫体积,2.自主神经系统,3.内分泌平衡,4.胎儿因子。不难理解,在 The mechanism of childbirth episodes is not fully understood. Although there are many theories, none of the theories have been satisfactorily justified. Reynold argues that many of the more rapidly changing control factors reach an unbalanced deadline, with childbirth occurring. At present, many believe that the onset of childbirth, mainly due to changes in the balance of uterine contractions and regulatory mechanisms caused by changes. These regulators include: 1. Uterine volume, 2. Autonomic nervous system, 3. Endocrine balance, 4. Fetal factors. It’s easy to understand, at