Preoperative Immunonutrition and Elective Colorectal Resection Outcomes.

Area of Science:

• Surgical outcomes research
• Nutritional support interventions
• Comparative effectiveness research

Background:

• Randomized controlled trials confirm the efficacy of arginine-enriched nutritional supplements (immunonutrition) in reducing postoperative complications.
• The effectiveness of preoperative immunonutrition has not been extensively evaluated in a community setting.

Purpose of the Study:

• To determine if preoperative immunonutrition improves outcomes in patients undergoing elective colorectal surgery within a community setting.
• To assess the impact of immunonutrition on serious adverse events and length of hospital stay.

Main Methods:

• Prospective cohort study utilizing propensity score-matched comparative effectiveness evaluation.
• Conducted in Washington State hospitals (2012-2015) involving adult patients undergoing elective colorectal surgery.
• Intervention involved oral immunonutrition (237 mL, 3 times daily) for 5 days preoperatively.

Main Results:

• A total of 3,375 patients were analyzed; 960 were propensity score-matched.
• Patients receiving immunonutrition showed a statistically significant reduction in prolonged length of stay (RR, 0.77; p=0.05).
• Rates of serious adverse events (infection, anastomotic leak, reoperation, death) were not significantly different between groups.

Conclusions:

• Reductions in prolonged length of stay, potentially due to fewer complications, support immunonutrition use in quality improvement initiatives for elective colorectal surgery.
• This population-based study corroborates prior trials but indicates a potentially smaller benefit, possibly due to compliance or lower adverse event rates.
• Community-based assessments of comparative effectiveness are valuable for understanding real-world intervention impacts.