Frequency of overactive bladder (OAB) and the factors affecting it in patients with obstructive sleep apnea syndrome (OSAS)

Abstract

Purpose:

To investigate the prevalence of overactive bladder (OAB) in patients with obstructive sleep apnea syndrome (OSAS) and the factors affecting it.

Materials and methods:

A total of 255 patients were included in this prospectively designed study. Among all patients, 166 were male, 89 were female; 213 patients were married and 42 were single. All patients underwent polysomnography. All patients completed the OAB-V8 form. OSAS was diagnosed via polysomnography. OAB was diagnosed via OABV8. The participants were evaluated as patients with and without OAB and those with and without OSAS. SPSS for Windows version 18.0 software was used for the statistical analysis and the level of significance was set at α = 0.05.

Results:

The prevalence of OAB was high among the OSAS patients (66.3%, n = 136). Age, body mass index, waist circumference, marital status, oxygen desaturation index (ODI4) ⩾4%, apneahypopnea index (AHI), the number and duration of decreases in O₂ saturation below 90%, wake after sleep onset (WASO) duration, and groups, and OSAS severity were different in the OAB group (p < 0.05). Duration and number of O₂ saturation <90%, and ODI4 are higher in the OSAS group and OAB group (p < 0.05). In multivariate logistic regression analysis, AHI, WASO, age, and marital status were the factors influencing OAB.

Conclusion:

OAB is seen at a high rate in OSAS patients. Hypoxia is the main basis for both diseases and probably it is the common pathway. AHI, WASO, age, and marital status can provide valuable information to physicians for predicting OAB.