Preinjury Fed State Alters the Physiologic Response in a Porcine Model of Hemorrhagic Shock and Polytrauma

INTRODUCTION: Hemorrhagic shock and injury lead to dramatic changes in metabolic demands and continue to be a leading cause of death. We hypothesized that altering the preinjury metabolic state with a carbohydrate load prior to injury would affect subsequent metabolic responses to injury and lead to improved survival. METHODS: Sixty-four pigs were randomized to fasted (F) or carbohydrate prefeeding (CPF) groups and fasted 12 h prior to experiment. The CPF pigs received an oral carbohydrate load 1 h prior to anesthesia. All pigs underwent a standardized injury/hemorrhagic shock protocol. Physiologic parameters and laboratory values were obtained at set time points. RESULTS: Carbohydrate prefeeding did not convey a survival benefit; instead, CPF animals had greater mortality rates (47% vs. 28%; P = 0.153; log-rank [Mantel-Cox]). Carbohydrate prefeeding animals also had higher rates of acute lung injury (odds ratio, 4.23; 95% confidence interval, 1.1-16.3) and altered oxygen utilization. Prior to shock and throughout resuscitation, CPF animals had significantly higher serum glucose levels than did the F animals. CONCLUSIONS: Carbohydrate prefeeding did not provide a survival benefit to swine subjected to hemorrhagic shock and polytrauma. Carbohydrate prefeeding led to significantly different metabolic profile than in fasted animals, and prefeeding led to a greater incidence of lung injury, increased multiorgan dysfunction, and altered oxygen utilization.