Predictive Factors for Clean Intermittent Catheterization after Intravesical OnabotulinumtoxinA Injections in Women with Overactive Bladder: a Danish Retrospective Cohort Study

INTRODUCTION AND HYPOTHESIS: We aimed to evaluate the clean intermittent catheterization (CIC) rate in women undergoing their first OnabotulinumtoxinA (BTX-A) treatment and to investigate factors predictive of initiating CIC.

METHODS: This was a retrospective cohort of women, who had their first BTX-A treatment for symptoms of overactive bladder (OAB) syndrome, with a pretreatment urodynamic study (UDS). We reviewed demographic, medical and gynecological history, UDS, pretreatment bladder diaries, objective examinations, BTX-A treatment details, and post-void residual (PVR) reports in the electronic medical record. Botox® Allergan 100 International Units were injected into the detrusor at 10-20 sites. Statistical analyses included univariate and multivariate logistic regression analyses.

RESULTS: We included 397 women. Median age was 68 (Q1-Q3: 54-76) years. CIC rate was 8.6% (n = 34) following the first BTX-A treatment. Urgency urinary incontinence (UUI) reduced the risk of undergoing CIC (OR 0.30, 95% CI 0.09-0.97). A bladder capacity of 500 ml or greater in the bladder diary increased the risk of CIC (OR 2.46, 95% CI 1.06-5.70), whereas reported leakages were associated with a decreased risk of CIC (OR 0.24, 95% CI 0.10-0.57). Multivariate logistic regression analysis showed that anterior colporrhaphy (OR 3.71, 95% CI 1.52-9.06) and 10-ml increments in median maximum cystometric capacity (OR 1.03, 95% CI 1.00-1.06) predicted CIC, whereas UUI was a protective factor for CIC (OR 0.23, 95% CI 0.07-0.79).

CONCLUSIONS: A history of anterior colporrhaphy, large bladder capacity, and absence of incontinence episodes in bladder diary or UDS were risk factors for CIC after the first BTX-A treatment.