• Jessica Jay Fang, Ming-Ping Wu, Yu-Chun Yen, Jeng-Cheng Wu, and Hung-Yen Chin.
• Department of Obstetrics and Gynecology, Taipei Medical University Hospital and School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan, ROC.
• J Chin Med Assoc. 2021 Sep 1; 84 (9): 865-869.

BackgroundPregnancy and childbirth are frequently associated with overactive bladder syndrome (OAB). However, the role of parous effects in OAB among nulliparous (NP) women remains controversial.MethodsThis study investigated abnormal voiding patterns and detrusor overactivity (DO) among NP women with OAB in comparison with parous women. From August 2011 to December 2018, 906 patients met the inclusion criteria for participation and were divided into three groups: 221 patients in the NP group, 571 patients in the normal spontaneous delivery (NSD) group, and 114 patients in the cesarean section (CS) group. Urodynamic study examinations were performed, and the presence of DO, abnormal voiding patterns, and maximum urethral closure pressure (MUCP) was recorded. Data were analyzed using analysis of variance, χ2 tests, and independent t tests.ResultsCompared with parous women in the NSD and CS groups, patients in the NP group had a significantly higher prevalence of abnormal voiding patterns, DO, and MUCP. Furthermore, abnormal voiding patterns were significantly associated with DO and MUCP, respectively, especially in the NP group.ConclusionWe hypothesized that hypertonicity or poor relaxation of the pelvic muscle in NP women may cause functional BOO, which is related to their OAB.Copyright © 2021, the Chinese Medical Association.

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