Diagnostics (Aug 2022)

Distribution of Pathogens and Predictive Values of Biomarkers of Inflammatory Response at ICU Admission on Outcomes of Critically Ill COVID-19 Patients with Bacterial Superinfections—Observations from National COVID-19 Hospital in Croatia

  • Maja Ćurčić,
  • Marko Tarle,
  • Hani Almahariq,
  • Sonja Hleb,
  • Juraj Havaš,
  • Marko Pražetina,
  • Hrvoje Lasić,
  • Emil Dolenc,
  • Andrea Kukoč,
  • Antonija Mihelčić,
  • Ivan Miko,
  • Andrea Romić,
  • Danijela Tipura,
  • Željka Drmić,
  • Marcela Čučković,
  • Vanja Blagaj,
  • Ivica Lukšić,
  • Jasminka Peršec,
  • Andrej Šribar

DOI
https://doi.org/10.3390/diagnostics12092069
Journal volume & issue
Vol. 12, no. 9
p. 2069

Abstract

Read online

Background: Superinfections contribute to mortality and length of stay in critically ill COVID-19 patients. The aim of this study was to determine the incidence and pathogen distribution of bacterial and fungal superinfections of the lower respiratory tract (LRTI), urinary tract (UTI) and bloodstream (BSI) and to determine the predictive value of biomarkers of inflammatory response on their ICU survival rates. Methods: A retrospective observational study that included critically ill COVID-19 patients treated during an 11-month period in a Croatian national COVID-19 hospital was performed. Clinical and diagnostic data were analyzed according to the origin of superinfection, and multivariate regression analysis was performed to determine the predictive values of biomarkers of inflammation on their survival rates. Results: 55.3% critically ill COVID-19 patients developed bacterial or fungal superinfections, and LRTI were most common, followed by BSI and UTI. Multidrug-resistant pathogens were the most common causes of LRTI and BSI, while Enterococcus faecalis was the most common pathogen causing UTI. Serum ferritin and neutrophil count were associated with decreased chances of survival in patients with LRTI, and patients with multidrug-resistant isolates had significantly higher mortality rates, coupled with longer ICU stays. Conclusion: The incidence of superinfections in critically ill COVID-19 patients was 55.3%, and multidrug-resistant pathogens were dominant. Elevated ferritin levels and neutrophilia at ICU admission were associated with increased ICU mortality in patients with positive LRTI.

Keywords