Abstract:Objective To investigate the effect of postoperative pulmonary infection on the levels of endocrine indicators angiotensin Ⅱ (Ang-Ⅱ), norepinephrine (NE) and aldosterone (ALD) in patients with non-small cell lung cancer (NSCLC) and their clinical significance.Methods A total of 109 NSCLC patients after surgery admitted to the First Affiliated Hospital of the Medical College of Shihezi University from April 2019 to December 2021 were enrolled. According to whether the NSCLC patients developed pulmonary infection during postoperative hospitalization, they were divided into study group (with postoperative pulmonary infection, 34 cases) and control group (without postoperative pulmonary infection, 75 cases). The changes of Ang-Ⅱ, NE, ALD and pulmonary infection indicators before and after operation in the two groups were determined. The relationship between postoperative Ang-Ⅱ, NE, and ALD levels and postoperative pulmonary infection in NSCLC patients in the study group was analyzed.Results The differences of Ang-Ⅱ, NE, and ALD before and after the operation in the study group were higher than those in the control group (P < 0.05). Compared with the control group, the age was older, the operative duration and the duration of postoperative mechanical ventilation were longer, and the levels of Ang-Ⅱ, NE, and ALD were higher in the study group (P < 0.05). The multivariable Logistic regression analysis showed that age [O^R= 6.341 (95% CI: 2.609, 15.410) ], Ang-Ⅱ level [O^R = 3.662 (95% CI: 1.507, 8.900) ], NE level [O^R= 3.846 (95% CI: 1.582, 9.347) ], ALD level [O^R= 3.710 (95% CI: 1.526, 9.016) ], and the duration of postoperative mechanical ventilation [O^R= 4.063 (95% CI: 1.672, 9.875) ] were the factors affecting the occurrence of postoperative pulmonary infection in patients with NSCLC (P < 0.05). The differences of procalcitonin (PCT) level, C-reactive protein (CRP) level, and white blood cell (WBC) count before and after the operation in the study group were greater than those in the control group (P < 0.05). Pearson correlation analysis showed that the level of CRP was positively correlated with the levels of Ang-Ⅱ, NE, and ALD (r =0.718, 0.638 and 0.582, P =0.000, 0.029 and 0.033), and the WBC count was also positively correlated with the levels of Ang-Ⅱ, NE, and ALD in the study group (P < 0.05).Conclusions The occurrence of postoperative pulmonary infection in NSCLC patients is related to endocrine indicators including Ang-Ⅱ, NE, and ALD. The increases in the levels of these indicators may contribute to the pulmonary infection.