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(a) Comparison of the doses of fentanyl and (b) incidence of postoperative nausea and vomiting (PONV) between the dexmedetomidine plus fentanyl (DEX group) and neuroleptanalgesia (droperidol plus fentanyl (NLA group)) groups. Doses of fentanyl are expressed as mean ± standard deviations (SD). PONV was determined based on history of receiving an antiemetic (metoclopramide or domperidone).
*p < 0.05 vs corresponding NLA group.
