Abstract: Objective To investigate the clinical characteristics of the elderly patients with community-acquired pneumonia (CAP) combined with anemia and the impact of anemia on the prognosis of CAP. Methods A total of 323 elderly inpatients with CAP from January 2022 to December 2022 were selected as the research subjects. According to the diagnostic criteria for anemia, they were divided into anemia group (n=151) and non-anemia group (n=172). The general information, laboratory indicators, clinical outcomes and disease severity were recorded and compared between the two groups. Logistic regression was used to analyze the correlation of laboratory indicators or anemia with the prognosis of the elderly patients with CAP. Results The levels of prothrombin time, thrombin time, D-dimer,urea nitrogen, neutrophil to lymphocyte ratio (NLR) and the number of severe pneumonia cases in the anemia group were higher than those in the non-anemia group(P<0.05). The levels of C-reactive protein (CRP), lymphocyte, total protein, albumin, albumin-globulin ratio, indirect bilirubin, glutamic pyruvic transaminase and creatine kinase isoenzyme in the anemia group were significantly lower than those in the non-anemia group (P<0.05). There were no significant differences between the two groups in white blood cell count and procalcitonin (P>0.05). Logistic regression analysis showed that anemia, CRP, D-dimer, NLR, urea nitrogen and creatinine were the independent risk factors of death in the elderly patients with CAP (P<0.05). Conclusions Anemia is an independent risk factor for the death of the elderly patients with CAP. More attention should be paid to the hemoglobin management in clinical practice.

Key words: pneumonia, aged, anemia, prognosis, clinical characteristic