Patterns of Enteral Feeding, Feeding Intolerance, and Mortality in Traumatic Brain Injury: An Observational Study

Background: Patients with traumatic brain injury (TBI) are often underfed and frequently experience enteral feeding (EF) intolerance. We examined the association between EF timing, caloric intake and EF intolerance, and mortality. Methods: We retrospectively evaluated adult patients with moderate-to-severe TBI in a tertiary-care ICU. In the first 7 days, we recorded daily caloric intake from EF and the occurrence of EF intolerance-defined as a gastric residual volume > 500 mL or >250 mL with vomiting. Results: Among 298 patients, 210 (70.4%) received early EF. The median 7-day cumulative caloric intake was 7766 kcal for the early EF group (64.7% of caloric requirement) and 2783 kcal (23.1% of caloric requirement) for the late (after 48 h) EF group (p < 0.001). EF intolerance occurred in only 24 patients (8.1%), with no significant difference between the early and late groups. Hospital mortality was 13.8% with early EF versus 30.7% with late EF (p = 0.001), 8.5% with caloric intake ≥ 80% of requirement versus 21.3% with lower caloric intake (p = 0.02) and 50% in patients with EF intolerance versus 16.1% in those without intolerance (p < 0.001). In multivariable logistic regression analysis, early EF was associated with lower mortality (odds ratio 0.326; 95% confidence interval 0.165-0.644), whereas EF intolerance was associated with higher mortality (odds ratio 7.451; 95% confidence interval 2.787-19.922). Conclusions: In patients with moderate-to-severe TBI, early EF was associated with higher caloric intake and lower mortality compared to late EF. EF intolerance was uncommon but strongly associated with higher mortality.