Distribution, diagnosis, and analysis of related risk factors of multidrug-resistant organism in patients with malignant neoplasms.

Objective: In this study, we sought to investigate the distribution characteristics, early diagnosis, and related risk factors of multidrug-resistant organism (MDRO) in patients with malignant tumors.

Methods: A total of 278 patients with malignant tumors and infections were selected in the Department of Oncology for retrospective study, including 128 MDRO patients and 150 non-MDRO patients. The markers of bacterial culture were detected, and the serum procalcitonin (PCT), C-reactive protein (CRP), and serum amyloid A (SAA) levels were measured in patients' blood samples. The diagnostic value of PCT, CRP, and SAA for MDRO was evaluated, the distribution of MDRO in different years and different infection sites was analyzed, and the related risk factors of MDRO infection were studied.

Results: The PCT, CRP, and SAA in the MDRO group were significantly higher than those of the non-MDRO group (all P<0.001). The area under the curve of receiver operating characteristics for the diagnosis of MDRO by PCT, CRP, and SAA. The combination of the three was 0.792, 0.811, 0.755, and 0.842, respectively. The distribution of MDRO strains in different years was statistically different (P<0.05), as well as the distribution of MDRO in different infection sites (P<0.05). Multivariate regression analysis demonstrated that invasive operation, excessive bed rest, hypoproteinemia, PCT, and SAA were independent risk factors for MDRO infection in patients with malignant tumors (all P<0.05).

Conclusion: The combination of CRP, PCT, and SAA displays a value for early diagnosis of MDRO infection. MDRO infections in malignant tumors mainly include carbapenem-resistant Acinetobacter baumannii and carbapenem-resistant Escherichia coli. There are differences in terms of MDRO strains in different years and different infection sites, and there are many risk factors regarding MDRO infection in patients with malignant tumors. Intervention should be taken in order to reduce the rate of MDRO infection.