The research will be retrospective, and will include a review of medical history of all patients admitted in the COVID-19 ICU of the University hospital Osijek during 2020 and 2021.

Associated comorbidity, hospital admission date, intubation date, mechanical ventilation, extubation, discharge, and patient final outcome will be recorded for each patient.

By analyzing X-rays of the lungs by radiology specialists, inflammatory infiltrates in the lungs will be quantified via the Brixia system, during hospital admission, admission to the Respiratory Center, and during treatment at the Respiratory Center.

All patients will have their SOFA and/or APACHE II values calculated upon admission.

Inflammatory parameters (CRP, PCT, IL-6, ferritin), red blood cell count, leukocytes, BUN, arterial blood gases and ventilation parameters on admission to the hospital, admission to the ICU, and on several occasions during treatment in the ICU will be analysed.

Also, empirical use of antibiotics, the occurrence of bacterial superinfections, sepsis and organic failure will be noted.

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