肽的增多并无差异，但低压灌注组的心室功能下降最明显，且不能用纳洛酮来改善
心肌功能的状况。
总之，对内啡肽系统在体外循环心脏手术中的生理学和功能还有很多问题需要
进一步阐明，在手术应激反应中内啡肽充当着重要的角色，需要人们更多的认识。
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