Assessment of outcomes
PONV, nausea, vomiting
The duration of surgery and the total amount of administered narcotics were recorded. All patients were kept in PACU for two hours and while assessing their vital signs (BP, HR, and SPO2), the occurrence and severity of PONV were evaluated and recorded as the primary outcome. In addition, the feeling of nausea, the frequency of vomiting, and the amount of receiving antiemetics rescue medicine after transferring to ward in time period intervals up to 24 h after the surgery were evaluated by an investigator who was unaware of the patients group. The 11-point verbal rating scale (VRS) index was used to record nausea. In this index, patients were asked to assign a number from 0 to 10 to assess their feeling of nausea, where the number zero means the absence of nausea and the number ten most intense feelings of nausea. The investigator also recorded the number of vomiting. A single dose intravenous 20 mg metoclopramide used as the rescue therapy of nausea, which allowed it to be administered by the investigator in case of vomiting; nausea with a score higher than seven did that lasted for more than 15 min and at the patient's own request.