ArticleClinics (Sao Paulo, Brazil)2026
Risk factors associated with mortality among patients with COVID-19 in the intensive care unit: prospective cohort study from the early pandemic phase in Brazil.
Article in Clinics (Sao Paulo, Brazil), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectiveThis prospective cohort study describes clinical, laboratory factors and virological factors associated with in-hospital mortality among 227 Intensive Care Unit (ICU) patients with SARS-CoV-2 infection admitted in Brazil during the pre-vaccination, pre-Omicron phase of the pandemic (September 2020 to March 2021).
methodsClinical and laboratory data were extracted from medical records, and viral load was quantified by RT-qPCR Cycle threshold (Ct) values. Independent predictors of mortality were evaluated using multivariable Cox proportional hazards regression, and survival was analyzed with Kaplan-Meier curves.
resultsNon-survivors were significantly older (p < 0.001) and more likely to have hypertension (p = 0.014) and chronic respiratory disease (p = 0.042). At admission, they exhibited higher leukocyte counts (p = 0.001), D-dimer (p = 0.028), and creatinine levels (p = 0.001), as well as more frequent tracheal intubation (p < 0.001). During hospitalization, non-survivors showed persistently elevated leukocyte counts and developed more complications, including acute kidney injury, septic shock, and cardiac arrest (p < 0.001). Viral load was higher in non-survivors (p = 0.026) and among those requiring intubation (p = 0.042) or with cardiovascular disease (p = 0.016). In the multivariable Cox model, only creatinine at admission remained independently associated with mortality (HR = 1.18; 95% CI: 1.00-1.39; p = 0.049). Survival analysis showed reduced survival among patients aged ≥ 65-years (p = 0.004) and those with chronic respiratory disease (p = 0.029).
conclusionsThis study integrates clinical, laboratory, and viral load data to detail the early COVID-19 severity and mortality patterns in a Brazilian ICU.
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