Randomised trial of safety and efficacy of immediate postoperative enteral feeding in patients undergoing gastrointestinal resection

Abstract

Objectives: To assess whether immediate post-operative enteral feeding in patients who have undergone gastrointestinal resection is safe and effective.

Design: Randomised trial of immediate post-operative enteral feeding through a nasojejunal tube v conventional postoperative intravenous fluids until the reintroduction of normal diet.

Setting: Teaching hospitals in London.

Subjects: 30 patients under the care of the participating consultant surgeon who were undergoing elective laparotomies with a view to gastrointestinal resection for quiescent, chronic gastrointestinal disease. Two patients did not proceed to resection.

Main outcome measures: Nutritional state, nutritional intake and nitrogen balance, gut mucosal permeability measured by lactulose-mannitol differential sugar absorption test, complications, and outcome.

Results: Successful immediate enteral feeding was established in all 14 patients with a mean (SD) daily intake of 6.78 (1.57)MJ (1622 (375) kcal before reintroduction of oral diet compared with 1.58 (0.14) MJ (377 (34) kcal) for those on intravenous fluids (P < 0.0001). Urinary nitrogen balance on the first postoperative day was negative in those on intravenous fluids but positive in all 14 enterally fed patients (mean (SD) - 13.2 (11.6) g v 5.3 (2.7) g; P < 0.005). There was no difference by day 5. There was no change in gut mucosal permeability in the enterally fed group but a significant increase from the test ratios seen before the operation in those on intravenous fluids (0.11(0.06) v 0.15 (0.12); P < 0.005). There were also fewer postoperative complications in the enterally fed group (P < 0.005).

Conclusions: Immediate postoperative enteral feeding in patients undergoing intestinal resection seems to be safe, prevents an increase in gut mucosal permeability, and produces a positive nitrogen balance.