Objective:To compare the clinical efficacy and safety of fentanyl per patient-controlled analgesia(PCA) intravenous- ly and intravenous morphine(CAT) after cardiac surgery.
目的：对比研究心外科术后静脉芬太尼病人自控镇痛（PCA）与传统间断肌肉注射镇痛（CAT）的临床效果及安全性。
Objective:To compare the clinical efficacy and safety of fentanyl per patient-controlled analgesia(PCA) intravenous- ly and intravenous morphine(CAT) after cardiac surgery.
目的：对比研究心外科术后静脉芬太尼病人自控镇痛（PCA）与传统间断肌肉注射镇痛（CAT）的临床效果及安全性。
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