Comparison of efficacy of oxybutynin and tolterodine for prevention of catheter related bladder discomfort: a prospective, randomized, placebo-controlled, double-blind study.

BACKGROUND Bladder discomfort related to intraoperative catheterization of urinary bladder is a distressing symptom and more so in patients awakening from anaesthesia. These symptoms are similar to symptoms of overactive bladder. Muscarinic receptor antagonists have been reported to be effective in the treatment of overactive bladder. This study was therefore undertaken to evaluate the efficacy of oxybutynin and tolterodine in preventing catheter related bladder discomfort. METHODS Two hundred and thirty-four consecutive adult patients, ASA I and II, of either sex, undergoing elective percutaneous nephrolithotomy surgery requiring urinary bladder catheterization were randomized into three equal groups of 78 each. Group C (control) received placebo, Group O (oxybutynin) received oxybutynin 5 mg and Group T (tolterodine) received tolterodine 2 mg orally 1 h before surgery. After induction of anaesthesia patients were catheterized with a 16 Fr Foley's catheter and the balloon was inflated with 10 ml distilled water. The bladder discomfort was assessed at 0, 1, 2 and 6 h after patient's arrival in the post-anaesthesia care unit. Severity of bladder discomfort was graded as mild, moderate and severe. RESULTS Incidence of bladder discomfort observed in the control group was higher, i.e. 58% (45/78), compared with oxybutynin and tolterodine groups where it was 35% (28/78) and 33% (26/78), respectively (P<0.05). Significant reduction in the severity of bladder discomfort was also observed after oxybutynin and tolterodine therapy compared with control (P<0.05). CONCLUSION Pretreatment with either oxybutynin or tolterodine reduces the incidence and severity of catheter related bladder discomfort.