Surveillance of multi-resistant microrganisms and epidemiological investigation of intensive care unit patients

Abstract

It is of great importance to detect the presence of microorganisms in healthcare services. On this basis, strategies should be developed to maintain safety inside the hospital environment by preventing the transmission of microorganisms, thus preventing healthcare-associated infections (HAI). In the Intensive Care Unit (ICU), the precocious detection of infection and/or colonization by multidrug-resistant (MDR) microorganisms is key. For this reason, the routine monitoring of patients that are infected or colonized by MDR microorganisms is mandatory. In this context, this study aimed to evaluate the performance of epidemiological surveillance swabs and microbiological cultures in ICU patients in a university public hospital in Belo Horizonte, Minas Gerais State, Brazil. Medical records of patients admitted to the ICU from January 1st, 2018 to December 31st, 2020, submitted to epidemiological surveillance cultures, and presenting factors correlated to the development of HAI were evaluated. This was a descriptive, retrospective and observational, non-interventional study. The study population was composed mainly of male patients (66.3%), with a mean age of 59 years, coming from the Medical Clinic department, and septicemia was the main cause of hospitalization in the ICU. The analyses showed that 9.5% of the patients were colonized by MDR microorganisms. The samples were collected at the ICU, and a higher frequency of gram-negative bacteria was observed, including A. baumannii, P. aeruginosa, K. pneumoniae, and carbapenem-resistant Enterobacteriaceae. The most frequently prescribed antimicrobials were β-lactams and glycopeptides, and the same patient was treated using more than one class of antimicrobials. The surveillance culture is key to understanding the microbiological profile of the institution. The collection of swabs and microbiological cultures from different sites could be used to adopt routines and recommend measures aimed at controlling and reducing the HAI rates as well as the emergence of MDR outbreaks. These procedures could contribute to the creation and maintenance of a safe and effective healthcare service.