Abstract: In this study, ECG changes, serum C-reactive protein levels and erythrocyte sedimentation rate levels in patients with secondary pulmonary tuberculosis of different conditions were observed in order to explore the possible relationship between these three clinical tests and the types and extent of lung tissue injury. Firstly, 72 patients with newly diagnosed secondary pulmonary tuberculosis were selected as the study objects, and 72 patients with pneumonia alone were selected as the control group, we compared the difference of ECG changes and inflammatory indicators between the two groups. Then, patients in the observation group were classified according to the degree of injury and the types of lesions, and the three test results were compared between them. The results showed that patients with secondary pulmonary tuberculosis in this study were more likely to have abnormalities in ECG than patients with pneumonia 866 alone, and the frequency of tachyarrhythmia and ST-T changes was higher. There were differences among patients with different degrees of injury, but there was no difference among patients with different types of secondary pulmonary tuberculosis. The level of inflammatory indicators was higher in patients with secondary pulmonary tuberculosis than in patients with simple pneumonia, which had significant differences among patients with different degrees of injury, but no difference among patients with different types of secondary pulmonary tuberculosis. This study showed that ESR, CRP level and abnormal ECG changes in patients with secondary pulmonary tuberculosis were related to their degree of lesions.

Key words: pulmonary tuberculosis, electrocardiogram, C-reactive protein, erythrocyte sedimentation rate