Participants
desaturation
RESOLUTION
Patients who required hospitalization for COVID-19 were invited to participate in the study at different hospital inpatient units. None of the participants had been vaccinated against COVID-19. The criteria for hospital admission and hospitalization in the ICU followed the recommendations of the São Paulo State Department of Health, Resolution SS-28 of March 17/2020, prepared by the Hospital das Clínicas of the School of Medicine of the University of São Paulo. The presence of an increased respiratory rate or desaturation (respiratory rate ≥24 IRPM and O