World journal of urology · 2026
Irritable bowel syndrome subtype predicts treatment response and defines distinct mechanistic phenotypes in OAB-IBS comorbidity: a prospective observational study.
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Sun Qi, Gao Yubo, Shi Xinhang, Xie Ming, Zheng Jun, Yang Xunguo, Yang Lin, Liao Rulin, Ma Cunzhen, Li Zhuohang, Sun Boyuan, Cheng Bisheng, Wu Peng
Аннотация
PURPOSE: To investigate the heterogeneity of treatment response in patients with concomitant Overactive Bladder (OAB) syndrome and Irritable Bowel Syndrome (IBS), including diarrhea-predominant (IBS-D), constipation-predominant (IBS-C), and mixed-type (IBS-M), by stratifying outcomes by both treatment strategy and IBS subtype. We hypothesized that IBS subtype would predict therapeutic response and define distinct mechanistic phenotypes.
METHODS: In this prospective, observational cohort study (N = 144, screened from 259), patients were allocated to one of four non-randomized cohorts: OAB-Targeted Monotherapy (OAB-TM, n = 45), OAB-Targeted Dual Therapy (OAB-TD, n = 29), IBS-Targeted Monotherapy (IBS-TM, n = 47), or IBS-Targeted Dual Therapy (IBS-TD, n = 23). Outcomes included changes in OABSS, IBS-SSS, PHQ-9, GAD-7, and QOL scores over 8 weeks. Efficacy was compared using ANCOVA, adjusted for baseline scores. Objective data from uroflowmetry parameters and baseline predictors of response were analyzed.
RESULTS: Dual therapy demonstrated superior improvement over monotherapy across all symptom, mood, and QOL domains. However, stratified analysis revealed significant heterogeneity. In the IBS-targeted cohort, the superiority of dual therapy for OAB improvement was highly significant in the IBS-D subtype but not in IBS-M or IBS-C subtypes. This corresponded to distinct baseline uroflowmetry parameters: IBS-D patients typically showed high-peak tower-shaped curves, while IBS-C patients showed staccato patterns. Furthermore, baseline anxiety (GAD-7) and depression (PHQ-9) scores significantly predicted OAB cross-organ improvement in the IBS-TM cohort.
CONCLUSION: OAB-IBS comorbidity is not a monolithic entity but comprises distinct clinical phenotypes (pelvic floor-driven, central sensitization-driven, bladder-primary). These findings suggest that a uniform treatment protocol may be suboptimal, supporting a precision-medicine framework where management is tailored based on the patient's specific IBS subtype.
METHODS: In this prospective, observational cohort study (N = 144, screened from 259), patients were allocated to one of four non-randomized cohorts: OAB-Targeted Monotherapy (OAB-TM, n = 45), OAB-Targeted Dual Therapy (OAB-TD, n = 29), IBS-Targeted Monotherapy (IBS-TM, n = 47), or IBS-Targeted Dual Therapy (IBS-TD, n = 23). Outcomes included changes in OABSS, IBS-SSS, PHQ-9, GAD-7, and QOL scores over 8 weeks. Efficacy was compared using ANCOVA, adjusted for baseline scores. Objective data from uroflowmetry parameters and baseline predictors of response were analyzed.
RESULTS: Dual therapy demonstrated superior improvement over monotherapy across all symptom, mood, and QOL domains. However, stratified analysis revealed significant heterogeneity. In the IBS-targeted cohort, the superiority of dual therapy for OAB improvement was highly significant in the IBS-D subtype but not in IBS-M or IBS-C subtypes. This corresponded to distinct baseline uroflowmetry parameters: IBS-D patients typically showed high-peak tower-shaped curves, while IBS-C patients showed staccato patterns. Furthermore, baseline anxiety (GAD-7) and depression (PHQ-9) scores significantly predicted OAB cross-organ improvement in the IBS-TM cohort.
CONCLUSION: OAB-IBS comorbidity is not a monolithic entity but comprises distinct clinical phenotypes (pelvic floor-driven, central sensitization-driven, bladder-primary). These findings suggest that a uniform treatment protocol may be suboptimal, supporting a precision-medicine framework where management is tailored based on the patient's specific IBS subtype.