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The Impact of Body Mass Index in Patients with Severe Burn Injury

This study evaluated the association of body mass index (BMI) with mortality, length of stay in the intensive care unit (ICU), and length of hospital stay in major burn patients. It was a retrospective cohort study that was originally conducted from January 2017 to January 2020 and that used data from patients admitted to the intensive care unit for burns at a university hospital. The patients were divided into groups for the purposes of comparing relevant variables according to their BMI. We evaluated 288 patients: 52.8% were classified as eutrophic, 33.7% were classified as overweight, and 13.5% were classified as obese. The median length of stay in the ICU was 11 days for all patients, 9 days for eutrophic patients, 13 days for overweight patients, and 16 days for obese patients (p = 0.004). In the multivariate analysis, age (HR = 1.026; p < 0.001), total body surface area (HR = 1.047; p < 0.001), and the presence of inhalation injury (HR = 1.658; p = 0.026) were associated with mortality. Obesity was not associated with higher hospital mortality in this sample of burn patients. The length of stay in the ICU was longer among obese patients. Age, burned body surface, and the presence of inhalation injury were the major determinants of death in these patients.