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Background  Postoperative nausea and vomiting (PONV) is one of the most frequent complications following strabismus surgery. Penehyclidine, an anticholinergic agent, is widely used as premedication. This study investigated the effect of preoperative penehyclidine on PONV in patients undergoing strabismus surgery.    Methods  In this prospective, randomized, double-blind study, patients scheduled for strabismus surgery under general anesthesia were randomly assigned to either penehyclidine ( n  = 114) or normal saline ( n  = 104) group. Penehyclidine was administrated immediately after anesthesia induction, and normal saline was substituted as control. PONV was investigated from 0 to 48 h after surgery. Intraoperative oculocardiac reflex (OCR) was also recorded.    Results  Compared with normal saline, penehyclidine significantly reduced PONV incidence (30.7% vs. 54.8%,  P <  0.01) and mitigated PONV severity as indicated by severity scoring ( P <  0.01). Compared with normal saline, penehyclidine also significantly reduced OCR incidence (57.9% vs. 77.9%,  P <  0.01) and mitigated OCR severity, as indicated by the requirement for atropine rescue (77.3% vs. 90.1%,  P <  0.05) and the maximum decrease of heart rate during OCR (23.1 ± 9.4 bpm vs. 27.3 ± 12.4 bpm,  P  < 0.05). The recovery course did not differ between groups.    Conclusions  Penehyclidine administrated after anesthesia induction significantly reduced the incidence of PONV and alleviated intraoperative OCR in patients undergoing strabismus surgery.    Trial registration  ClinicalTrials.gov ( NCT04054479 ). Retrospectively registered August 13, 2019.

bmc anesthesiology

Penehyclidine mitigates postoperative nausea and vomiting and intraoperative oculocardiac reflex in patients undergoing strabismus surgery: a prospective, randomized, double-blind comparison