Hypothesis: Obesity is associated with increased morbidity and mortality in critically injured blunt trauma patients.
Design: Case-control study of all critically injured blunt trauma patients between January 2002 and December 2002.
Setting: Academic level I trauma center at a county referral hospital.
Patients:Two hundredforty-two consecutive patients admitted to the intensive care unit following blunt trauma. Patients were divided into 2 groups by body mass index. The obese group was defined as having a body mass index of 30 kg/m2 or higher, and the nonobese group was defined as having a body mass index lower than 30 kg/m².
Main Outcome Measures: Univariate and multivariate analyses were performed to identify risk factors for mortality. Complications and length of stay were also evaluated.
Results: Of the 242 patients, 63 (26%) were obese, and 179 (74%) were nonobese. The obese and nonobese groups were similar with regard to age (mean±SD, 49±18 years vs 45±22 years), male sex (63% vs 72%), Glasgow Coma Scale score (mean±SD, 11±5 vs 11±5), and injury severity score (mean±SD, 21±13 vs 20±14). The obese group had a higher body mass index (mean±SD, 35±7 vs 24±3; P<.001). Mechanisms of injury and injury patterns were similar between groups. The obese group had a higher incidence of multiple organ failure (13% vs 3%; P=.02) and mortality (32% vs 16%; P=.008). Obesity was an independent predictor of mortality with an adjusted odds ratio of 5.7 (95% confidence interval, 1.9-19.6; P=.003).
Conclusions: Critically injured obese trauma patients have similar demographics and injury patterns as nonobese patients. Obesity is an independent predictor of mortality following severe blunt trauma.