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| Effects of the delivery interval time of puerpera with different delivery modes on the strength of their pelvic floor muscle fibers |
| Northwest Women's and children's Hospital, Xi'an, Shaanxi Province, 710061 |
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Abstract To compare the effects of the interval time of two deliveries of puerpera with different delivery modes on the muscle strength of their class I and II muscle fibers of pelvic floor muscles, and to explore the optimal delivery interval. Methods: A total of 2593 puerpera with second-child women who had undergone pelvic floor function examination from June 2017 to June 2021 were collected retrospectively. The relevant clinical data of the puerpera were collected, and the pelvic floor surface electromyography of the puerpera was evaluated. According to the interval time of two deliveries of different delivery methods and the muscle strength of pelvic floor muscle fibers of class I and II of the puerpera, the curve fitting was conducted and functional equation of the interval time of delivery and muscle strength was obtained. The accuracy of the functional equation was verified by drawing receiver operator characteristic(ROC) curve and calculating the maximum area under the curve and the relative error rate. Results: 2593 puerpera were divided into different groups based on the two deliveries modes, including 648 cases with vaginal-vaginal delivery, 528 cases with vaginal delivery-cesarean section, 1400 cases with cesarean- cesarean section, and17 cases with cesarean-vaginal delivery. The curve fitting results showed that it was a quadratic curve. The muscle force of class I muscle fibers was>35μV and class II muscle fiber strength>40μV, the appropriate intervals included the vaginal-vaginal delivery group of 6-8 years, the vaginal-cesarean section group of 4-9 years, and the cesarean-cesarean section group of 2-10 years. The years of the conic curve reached to the peak included 7-8 years for the puerpera with vaginal vaginal delivery group, 7-8 years for the puerpera with vaginal- cesarean section, and 6 years for the puerpera with cesarean-cesarean section. The maximum area under the curve of the muscle strength curve of Class I and II muscle fibers in these groups were all>0.6(all P＜0.05), with the average relative error rate of 4.909%. Conclusion: This study considers the maintenance of pelvic functions of the puerpera, and the appropriate interval between two deliveries is 6-8 years.
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