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Dose-ranging effect of systemic diphenhydramine on postoperative quality of recovery after ambulatory laparoscopic surgery: a randomized, placebo-controlled, double-blinded, clinical trial

Dose-ranging effect of systemic diphenhydramine on postoperative quality of recovery after ambulatory laparoscopic surgery: a randomized, placebo-controlled, double-blinded, clinical trial

Journal of Clinical Anesthesia 34: 46-52

Diphenhydramine is an antihistamine with previously demonstrated analgesic and antiemetic properties. However, it is unknown if the beneficial perioperative properties of diphenhydramine can translate to a better quality of postsurgical recovery. The main objective of the current investigation was to investigate dose-ranging effects of diphenhydramine on quality of recovery after surgery. Tertiary hospital in the United States. A prospective, randomized, double-blind trial. Saline, diphenhydramine 25 >mg, or diphenhydramine 50 mg given intravenously before induction. The primary outcome was global Quality of Recovery-40 at 24hours. Postoperative pain, nausea, opioid consumption, and discharge time were also evaluated. Ninety subjects were randomized, and 75 completed the study. The median (interquartile range) Quality of Recovery-40 scores were not different among study groups: 164 (151-189), 169 (159-181), and 172 (157-185) for the saline, 25-mg diphenhydramine, and 50-mg diphenhydramine groups, respectively (P=.74). Postoperative nausea was decreased in the 50-mg group, 3 of 24 (12.5%), compared with the saline group, 12 of 27 (44%), P=.01. There was an inverse linear association between postoperative opioid consumption and quality of recovery (R(2)=0.37, P<.001). Diphenhydramine does not provide dose-ranging improvements on postoperative quality of recovery after ambulatory laparoscopic gynecologic surgery. Our results support a recent concept that not all postoperative nausea and vomiting symptoms are clinically important. Future studies evaluating postoperative nausea and vomiting should include patient-centered outcomes to validate the clinical importance of the examined interventions.

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Accession: 057658004

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PMID: 27687344

DOI: 10.1016/j.jclinane.2016.03.046

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