Comparisons of urodynamic characteristics between female patients with overactive bladder and overactive bladder plus stress urinary incontinence

Objectives. To determine and compare the urodynamic characteristics in patients with overactive bladder (OAB) and patients with OAB plus stress urinary incontinence (OAB+SUI). Methods. A total of 120 patients (60 each in OAB and OAB+SUI groups) who underwent urodynamic study between January and April 2003 were recruited. A detailed history, physical examination, and multichannel urodynamic data, including uroflowmetry, filling and voiding cystometry, stress urethral pressure profile, and 20-minute pad test were obtained for each patient. The urodynamic findings of each patient were analyzed and the results compared between the two groups. Results. The median age of both groups was 51 years (interquartile range 43 to 64) with a parity of 3 (interquartile range 2 to 4); 54% (n = 65) were menopausal. The urodynamic parameters of bladder storage function showed premature filling sensation with decreased bladder capacity. Additionally, 60 (50%) had genuine stress incontinence, 3 (3%) had idiopathic detrusor overactivity, 11 (9%) mixed type incontinence, and 12 (11%) had voiding dysfunction. Among the urodynamic parameters between the two groups, first desire, strong desire, urgency, functional urethral length, maximal urethral pressure, maximal urethral closure pressure, pad test, and percentage of genuine stress incontinence in the OAB+SUI group were significantly lower statistically than those in the OAB group (P <0.03); the differences in age, parity, and percentage of menopausal status were also statistically significant (P <0.03). Conclusions. Our data showed that patients in the OAB+SUI group had more impaired urodynamic parameters than those in the OAB group. Age, parity, and menopausal status were contributory factors.