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体外循环期间外周血淋巴细胞 肾上腺素能受体的变化 |
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李永荣 姚德厚 郭贵林 郁振邦 李幼英
摘要 目的:研究体外循环期间β肾上腺素能受体(β受体)功能的变化。方法:16例择期心脏直视手术病人,于麻醉前、CPB前、CPB15分、CPB60分和CPB结束时取血,用放射配基结合法和放免分析法测定淋巴细胞β受体数目和异丙肾上腺素刺激的淋巴细胞CAMP产量,血浆儿茶酚胺的测定用高效液相色谱电化学法。结果:血浆儿茶酚胺在CPB期间显著升高,淋巴细胞β受体数目在CPB60分和CPB结束时显著降低,异丙肾上腺素刺激的CAMP产量在CPB15分明显下降,CPB60分和CPB结束时维持在较低水平。结论:CPB可降低淋巴细胞β受体功能。CPB早期表现为受体脱耦联,晚期主要表现为受体向下调节。 关键词 受体,肾上腺素能β 环磷酸腺苷 儿茶酚胺 心肺转流术
The Changes of β-adrenergic receptor function in lymphocytes during cardiopulmonary bypass Li Yongrong,Yao Dehou,Guo Guilin,et al.Department of Anesthesiology,Chengdu Army General Hospital,Chengdu 610083 Abstract Objective:To investgate the changes of β-adrenergic receptor function in lymphocytes during cardiopulmonary bypass(CPB).Method:Density of β-adrenergic receptor(Bmax)and isoproterenol-stimulated cAPM product in lymphocytes at the different time point duing CPB were measured with radioligand binding assay and radioimmunoassay in sixteen patients undergoing cardiac surgery.Plasma catecholamine level was assaied wtih high performance liquid chromatography.Result:Plasma catecholamine concentration increased significantly during CPB.The Bmax and affinity of β-receptor decreased significantly at CPB 60th min and CPB end.The isoproterenol-stimulated cAMP content in lymphocytes reduced significantly at CPB 15th min and was maintained at low level till CPB ended.Conclusion:CPB can decrease function of β-adrenergic receptor, the receptor uncopling or down-regulation is demonstrated at early or late stage. Key words Receptors,adrenergic,beta Catecholamine Cardiopulmonary bypass
体外循环(CPB)心脏手术后24小时β肾上腺素能受体(β受体)可发生失敏和下调〔1〕。但在CPB期间,β受体是否发生失敏和下调,未见文献报道。淋巴细胞β受体能反映心脏β受体的变化〔2〕。因此,我们以外周血淋巴细胞为模型,旨在探讨CPB期间β受体功能的变化。
资料与方法
选择16例择期CPB下行直视心脏手术的病人,其中二尖瓣置换术9例,主动脉瓣置换术5例,二尖瓣和主动脉瓣同时置换术2例。男9例,女7例,年龄28~46岁,体重42~72kg。安定、芬太尼、琥珀酰胆碱诱导气管插管,芬太尼、阿曲库铵维持麻醉,控制呼吸。胸骨正中切口,全身中度低[1] [2] [3] 下一页 上一个医学论文: 脑干手术中自主呼吸静脉麻醉下脑氧的供需 下一个医学论文: 高位硬膜外麻醉对急性心肌梗塞患者游离脂肪酸的影响
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