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(A) Mechanically evoked pain tactile pain threshold before and 24 h after surgery. (B) Extent of hyperalgesia 24 h after surgery. Group L: 0.1 µg/kg/min remifentanil, Group H: 0.3 µg/kg/min, Group HK: 0.3 µg/kg/min remifentanil plus 0.25 mg/kg ketamine. *P < 0.05 vs preoperative values, †P < 0.05 vs other two groups.
