Does a Preoperative Carbohydrate Drink Reduce Postoperative Inflammation? A Systematic Review and Meta-Analysis

Since 1995, it has been known that carbohydrate drinks (CHDs) can be safely consumed two to three hours (2–3 h) preoperatively. Furthermore, preoperative CHDs significantly benefit many outcomes, such as thirst, hunger, and insulin resistance. Patients, however, still fast excessively. This study aimed to determine if a CHD, consumed 2–3 h preoperatively, impacts postoperative inflammation compared to a placebo drink or fasting. This was achieved through analysing the levels of interleukin-6, C-reactive peptide, and serum albumin 10–24 h postoperatively. We conducted a systematic review of randomised control trials. We comprehensively searched the Embase, MEDLINE and Web of Science databases, identified 473 studies, and, after screening, were left with 10 randomised control trials. Our meta-analyses found a significantly lower mean interleukin-6 level of −21.26 pg/mL ((95% CI −33.37, −9.15); p = 0.0006) postoperatively in patients given a preoperative CHD compared to fasting and a significantly higher mean serum albumin level of 2.56 g/L ((95% CI 1.41, 3.71); p < 0.0001) postoperatively in patients given a preoperative CHD compared to a placebo. Our results therefore show that a CHD, consumed 2–3 h preoperatively, lowers proinflammatory cytokine levels and increases serum albumin levels. Thus, our study reinforces guideline recommendations to give patients a CHD 2–3 h preoperatively for improved outcomes.