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Postoperative pain and postoperative nausea and vomiting (PONV). (a) VAS: visual analogue scale. (b) PONV scale. L group: propofol-low dose remifentanil group; H group: propofol-high dose remifentanil group; T3: on arrival at postanesthetic care unit (PACU); T4: 30 min after arrival at PACU; T5: at 6 h after discharge from PACU; T6: at 24 h after discharge from PACU (T6).
