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目的:研究早期免疫型肠内营养联合谷氨酰胺（Gln）肠外营养对重症加强护理病房（ICU）重症肺部感染患者T淋巴细胞亚群的影响。方法:选取2017年1月至2019年10月在浙江省宁波市鄞州人民医院接受诊治的ICU重症肺部感染患者70例，按照完全随机数字表法将患者分为肠内营养组、联合组，各35例。两组患者均给予常规治疗；肠内营养组在常规治疗的基础上给予免疫增强型肠内营养；联合组在肠内营养组的基础上给予Gln。检测两组治疗前后动脉血氧分压（PaOn 2）、动脉血氧饱和度（SaOn 2）、动脉血二氧化碳分压（PaCOn 2）、CDn 8+、CDn 3+、CDn 4+/CDn 8+、降钙素原（PCT）、超敏C反应蛋白（hs-CRP）及肿瘤坏死因子-α（TNF-α）水平的变化，并比较两组的疗效。n 结果:联合组治疗后SaOn 2、PaOn 2水平高于肠内营养组，PaCOn 2水平低于肠内营养组，但差异无统计学意义（n P>0.05）。联合组治疗后CDn 3+、CDn 4+/CDn 8+水平高于肠内营养组[（62.37 ± 6.15）%比（59.35 ± 5.24）%、1.50 ± 0.18比1.12 ± 0.11]，CDn 8+水平低于肠内营养组[（33.15 ± 6.11）%比（37.72 ± 8.57）%]，差异有统计学意义（n P<0.05）。联合组治疗后PCT、hs-CRP及TNF-α水平低于肠内营养组[（3.83 ± 0.82）μg/L比（6.47 ± 1.34）μg/L、（6.92 ± 1.25）mg/L比（12.72 ± 3.83）mg/L，（92.35 ± 13.05）ng/L比（125.26 ± 18.35）ng/L]，差异有统计学意义（n P<0.05）。联合组治疗后总有效率高于肠内营养组[88.57%（31/35）比65.71%（23/35）]，差异有统计学意义（n χn 2=5.185，n P0.05). After treatment, the levels of CDn 3+, CDn 4+/CDn 8+ in combined group were higher than those in enteral nutrition group [(62.37 ± 6.15)% vs. (59.35 ± 5.24)%, 1.50 ± 0.18 vs. 1.12 ± 0.11], the level of CDn 8+ in combined group was lower than that in enteral nutrition group [(33.15 ± 6.11)% vs. (37.72 ± 8.57)%], and there were significant differences (n P<0.05). The levels of PCT, hs-CRP and TNF-αin combined group were lower than those in enteral nutrition group [(3.83 ± 0.82) μg/L vs. (6.47 ± 1.34) μg/L, (6.92 ± 1.25) mg/L vs. (12.72 ± 3.83) mg/L, (92.35 ± 13.05) ng/L vs. (125.26 ± 18.35) ng/L], and there were significant differences (n P<0.05). The total effective rate in combined group was higher than that in enteral nutrition group [88.57%(31/35) vs. 65.71%(23/35)], and there was significant difference (n χ2=5.185, n P<0.05).n Conclusions:Early immune enteral nutrition combined with Gln parenteral nutrition has significant effects on patients with severe pulmonary infection in ICU, and can improve the level of T-lymphocyte subsets, control infection, and reduce inflammatory factor levels.