目的探讨影响芬太尼病人自控静脉镇痛(PCIA)的因素，提高术后镇痛效果和质量。
Objective to analyse the influencing factors for patient-controlled intravenous analgesia (PCIA) by infusing fentanyl and improve the effect of postoperative pain relief.
目的观察恩丹西酮对乳腺癌根治术后曲马多病人自控静脉镇痛(PCIA)疗效的影响。
Objective to investigate the effect of ondansetron on the analgesic efficacy of tramadol for postoperative patient-controlled intravenous analgesia (PCIA).
目的：综合比较吗啡缓释片和病人自控静脉镇痛在晚期癌症病人疼痛治疗中的临床效果。
Aim: To compare the clinical analgesic efficacy of controlled-release morphine tablets and patient-controlled intravenous analgesia in late stage cancer patients.
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