Intraoperative Administration of Diphenhydramine Attenuates Postoperative Catheter Related Bladder Discomfort in Patient Following Percutaneous Nephrolithotomy

Background: We intend to evaluate the effect of intraoperative diphenhydramine administration on incidence and severity of catheter related bladder discomfort (CRBD) and pain after percutaneous nephrolithotomy. Methods: In a double blind randomized clinical trial, adult male patients undergoing percutaneous nephrolithotomy were enrolled. They were randomized into two groups by a computerized digital random allocation method. Before anesthesia induction, group D (Diphenhydramine group) (n = 48) received 5 ml normal saline containing 0.5 mg/kg of diphenhydramine intravenously. In group C (Control group) (n = 48), 5 ml of normal saline was injected in the same manner. Induction and maintenance of anesthesia were identical in both groups. The incidence and severity of CRBD and postoperative pain were assessed at recovery room. Results: The incidence of CRBD was significantly lower in group D than in group C (14% vs. 63%, P=0.001). The severity of CRBD was milder in group D in comparison to group C (P 0.05). Postoperative pain score was significantly lower in group D (P 0.05). Conclusion: Intraoperative administration of diphenhydramine is an effective practice for the prevention of CRBD after percutaneous nephrolithotomy in male patients and can reduce postoperative pain as well.