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Objective:The aim of the study was to observe and compare the trend of T-lymphocyte subsets in the elder and adult esophageal carcinoma patients postoperatively.Methods:Forty-four esophageal carcinoma patients,classified as ASA physical status Ⅰ-Ⅱ,were divided into two groups.Twenty-two patients aged than 65 years wore grouped as elder patient group,and the rest twenty-two patients,served as adult patient group,were younger than 60 years old.The jugular venous blood samples were collected before induction of anesthesia (T1) as baseline,after completion of surgery (T2),on the first,second and fifth postoperative days (T3,T4 and T5),respectively.The blood counts of CD3+,CD4+ and CD8+ T-lymphocyte were measured by flow cytometer.Results:Compared with the baseline level,the blood CD3+,CD4+ and CD4/CD8 levels were significantly decreased immediately after surgery,on the first and second postoperative days in the two groups (P＜0.01),which returned to baseline values on the fifth postoperative day (P＞0.05).On the fifth postoperative day,CD3+,CD4+ and CD4/CD8 levels in adult group were significantly higher than those in elder group (P＜0.05).Conclusion:The postoperative immune function in elder patients recovered more slowly than that in adult.