• Glaucia Galvão, Ana Luiza Mezzaroba, Fernanda Morakami, Meriele Capeletti, Olavo Franco Filho, Marcos Tanita, Tiago Feronato, Barbara Charneski, Lucienne Cardoso, Larissa Andrade, and Cintia Grion.
• Médico intensivista, Mestre, Universidade Estadual de Londrina, PR, Brasil.
• Rev Assoc Med Bras (1992). 2019 Nov 1; 65 (11): 1374-1383.

ObjectiveTo evaluate seasonal variations of clinical characteristics, therapeutic resource use, and outcomes of critically ill patients admitted to an intensive care unit.MethodsA retrospective cohort study conducted from January 2011 to December 2016 in adult patients admitted to the intensive care unit (ICU) of a University Hospital. Data were collected on the type of admission, APACHE II, SOFA, and TISS 28 scores at ICU admission. Length of hospital stay and vital status at hospital discharge were recorded. A significance level of 5% was adopted.ResultsDuring the study period, 3.711 patients were analyzed. Patients had a median age of 60.0 years (interquartile range = 45.0 - 73.0), and 59% were men. The independent risk factors associated with increased hospital mortality rate were age, chronic disease, seasonality, diagnostic category, need for mechanical ventilation and vasoactive drugs, presence of acute kidney injury, and sepsis at admission.ConclusionIt was possible to observe variations of the clinical characteristics and prognosis of patients; summer months presented a higher proportion of clinical and emergency surgery patients, with higher mortality rates. Sepsis at ICU admission did not show seasonal behavior. A seasonal pattern was found for mortality rate.

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