[Multiple factors analysis of early postpartum pelvic floor muscles injury in regenerated parturients].

Objective: To investigate the risk factors for multiparous pelvic floor muscles injury during 6-8 weeks after delivery. Method: From June 2015 to April 2017, 1917 women (1 523 primigravidas and 294 multiparas) were accepted postpartum pelvic floor function screening during 6-8 weeks after delivery in Beijing Hospital.Pelvic examination and pelvic floor muscle strength testing were carried out in these women.All the data were analyzed with multivariate logistic regression method to explore the related factors for postpartum pelvic floor muscle injury. Result: The incidence of muscle strength grades less than third grade was 63.60 % (type Ⅰ muscle fiber) and 24.83 % (type Ⅱ muscle fiber). Multivariate analysis showed that time interval, between two deliveries, less than 3 years ( OR =2.16, 95% CI 1.21-3.86), and maternal BMI<18.5 ( OR =3.04, 95% CI 1.10-9.30) and BMI≥28 ( OR =3.04, 95% CI 1.10-9.30) before pregnancy were risk factors for postpartum injury of type Ⅰ muscle fiber. Gestational age more than 40 weeks increased the risk of damaging type Ⅱ muscle fiber ( OR =2.79, 95% CI 1.156-6.76). Compared with cesarean section, vaginal delivery significantly increased the risk of injury of type Ⅰ and Ⅱ pelvic floor muscle fibers ( P <0.05). Conclusion: The incidence of multiparous pelvic floor muscle injury was high in early postpartum period.Several factors are related to the pelvic floor muscle injury.Pelvic floor rehabilitation in early postpartum and maternal education may be helpful to reduce the radio of injury.