目的测定围术期外周血T淋巴细胞亚群的变化，旨在探讨术中及术后连续硬膜外镇痛对免疫功能的影响。

Objective To investigate the influences of continuous epidural analgesia on immune function, authors observed the changes of peripheral blood T lymphocyte subsets during perioperative period.

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结论TEA镇痛不会对冠心病患者术后R-A-A-S产生不良影响，能有效地防止和治疗围术期心肌缺血和心肌梗死。

Conclusion TEA can inhibit the steess responses and has no adverse effects on R-A-A-S in postoperative. It can protect from myocardial ischemia and myocardial infarction around operation.

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