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目的观察吗啡与芬太尼联合术后镇疼对患者β-内啡肽的影响。方法择期肺癌手术患者90例,ASAⅠ~Ⅱ级,随机平均分为三组,全身麻醉术毕前30min,静脉接镇痛泵,A组镇痛泵药液为吗啡0.05mg/(kg·d),芬太尼4 μg/(kg·d),恩丹西酮0.08mg/(kg·d);B组镇痛泵药液为吗啡0.1mg/(kg·d),恩丹西酮0.08mg/(kg·d);C组镇痛泵药液为芬太尼8μg/(kg·d),恩丹西酮0.08mg/(kg·d),三组均