Abstract
A recent study demonstrated improvement in nocturnal urgency in patients with overactive bladder when treated with fesoterodine. In the current study we aimed to determine which bladder diary parameters predict the response to fesoterodine in these patients. Patients with nocturnal urgency completed a 2-week, single-blind placebo run-in followed by 1:1 double-blind randomization to 12 weeks of fesoterodine or placebo. We analyzed bladder diary parameter changes from baseline to week 12, including the actual number of night voids (total number of nocturia episodes), maximum voided volume, nocturnal bladder capacity, Nocturnal Bladder Capacity Index (NBCi) (actual number of night voids - nocturnal urine volume/maximum voided volume - 1), nocturnal urine volume, the nocturia index (nocturnal urine volume/maximum voided volume) and the nocturnal polyuria index (nocturnal urine volume/24-hour volume). Additionally, we analyzed OAB-q (Overactive Bladder Questionnaire) changes. There was a linear relationship between the likelihood of being a responder for NBCi and the nocturia index. Responders had a significant decrease in nocturnal urine volume relative to baseline (-181.7 ml, p <0.01). Neither group showed a significant change in maximum voided volume relative to baseline. There was a significant decrease in NBCi and the nocturia index in responders (-0.82 and -0.61, respectively, each p <0.01). Responders demonstrated improvement in the OAB-q concern, coping, sleep, bother and total score metrics. Patients with nocturnal urgency secondary to overactive bladder syndrome and low nocturnal bladder capacity with a mismatch between nocturnal urine production and bladder capacity may benefit from fesoterodine. Symptom improvement appears to be mediated by increases in typical rather than maximum nocturnal voided volumes. Symptom improvement was associated with improved quality of life.
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