Fig. 1. Kaplan-Meier estimates demonstrating the time to “rescue” with metoclopramide after initial treatment of established postoperative nausea and vomiting (PONV) with ondansetron (n = 30), acustimulation (n = 30), or combination (n = 30) therapy. Compared with the combination group, significantly more patients in the acustimulation group required a rescue antiemetic within the first 2 h after initiating the study treatment (P < 0.05).