Abstract
Introduction
Prior studies of burn patients with < 20% total body surface area (TBSA) burns have found that 15.4% of patients have major psychiatric illness (MPI) and 27.6% have Substance Use Disorder (SUD). In patients with small burns, SUD is associated with larger burn size and secondarily with longer length of stay while MPI is associated with longer lengths of stay while not increasing burn size. The purpose of this study was to determine whether MPI or SUD dependence affects outcomes such as mortality in patients with major burn injuries (≥20% TBSA).
Methods
A secondary analysis from the prospective, randomized, multicenter Transfusion Requirement in Burn Care Evaluation (TRIBE) study was conducted. Patients with MPI and SUD were compared with patients without these disorders. Statistical analysis with chi-square for categorical variables and student’s t-test for continuous variables was conducted. Mortality between those with and without MPI and SUD were analyzed with a multivariable regression analysis.
Results
A total of 347 patients with a mean age of 43±17 years, 274 men and 73 women, were analyzed. The mean total body surface area burn (TBSA) was 38±18%, and 23% had inhalation injury. In this study population, 29.1% had SUD, 7.5% had MPI, and 2.3% had both. There was no difference with respect to age, gender, TBSA, frailty, or assignment to the liberal or restrictive transfusion strategy based on the presence of MPI, SUD, or both. Inhalation injury was more common in patients with MPI (27%) or SUD (35%) when compared with patients without these comorbidities (18%) or those who have both (11%) (p=0.006). Patients with MPI were more likely to die of their burn injuries (27%) when compared with those with SUD (17%), both (11%), or neither (8%) (p=0.014). On multivariate analysis for mortality controlling for TBSA and inhalation injury, MPI was found to be an independent predictor of death with an odds ratio of 5 (95% confidence interval 1.7–15, p=0.003).
Conclusions
In burns >20% TBSA, both MPI and SUD influence patient’s likelihood of sustaining inhalation injury. MPI is also independently associated with mortality in the study. Further work must be done to mitigate the effects of mental illness on burn outcomes.