Early Enteral Nutrition Reduces Complication Burden After Pancreatoduodenectomy

Nutritional Optimization in Complex Pancreatic Resection

Pancreatoduodenectomy remains a high-stakes procedure frequently complicated by significant postoperative morbidity and protracted recovery periods. Patients requiring this intervention, particularly those with underlying pancreatic malignancy, often present with baseline malnutrition and cachexia (a complex syndrome of progressive muscle wasting and weight loss) [1]. While modern enhanced recovery after surgery protocols generally advocate for early oral intake to stimulate intestinal motility, the optimal route for providing nutritional support to those at high metabolic risk remains a point of clinical contention [2, 3]. Malnutrition is a well-documented independent predictor of adverse outcomes, including increased infection rates and impaired wound healing following major abdominal surgery [4, 5]. Clinicians must therefore determine whether standard oral feeding or more intensive enteral support better mitigates the cumulative burden of complications in these vulnerable patients. A recent multicenter randomized trial now offers evidence to clarify this long-standing debate in surgical nutrition.

Trial Design and Nutritional Protocols

The researchers conducted a parallel, open-label, superiority randomized clinical trial across three tertiary centers in Switzerland and France to evaluate the impact of immediate postoperative feeding strategies. From December 15, 2021, through October 8, 2024, the study enrolled patients undergoing pancreatoduodenectomy who were identified as being at increased nutritional risk. This risk was defined by a nutritional risk screening score of 3 or more, a validated tool that assesses weight loss, body mass index, and the severity of the underlying disease to predict the likelihood of malnutrition-related complications. A total of 144 patients were initially included, with 142 undergoing 1:1 randomization into either an early enteral nutrition (EEN) group or an oral nutrition (ON) group. After 24 patients dropped out (17%), the final analysis included 118 patients, with 59 individuals in each treatment arm. The trial was registered at ClinicalTrials.gov under the identifier NCT05042882.

The intervention for the EEN group involved the delivery of enteral nutrition immediately after surgery through a nasojejunal tube placed intraoperatively, which allows for the delivery of nutrients directly into the small intestine while bypassing the stomach. Notably, patients in the EEN group were also permitted to consume oral food following the same standardized protocol as the ON group, ensuring that enteral support supplemented rather than replaced oral intake. In contrast, patients randomized to the ON group were restricted from receiving any enteral nutrition during their hospitalization. To maintain consistency across both cohorts, the researchers standardized the requirements for parenteral nutrition (intravenous feeding), ensuring that the use of total or supplemental intravenous calories followed a strict clinical protocol regardless of the primary randomization group. This design allowed the investigators to isolate the specific effect of early tube feeding on the recovery trajectory of high-risk surgical patients.

Patient Characteristics and Study Timeline

The researchers conducted the recruitment phase over a nearly three-year period, with patient enrollment occurring from December 15, 2021, through October 8, 2024. This duration allowed the three participating tertiary centers in Switzerland and France to identify a sufficient cohort of high-risk surgical candidates. Following the completion of the clinical follow-up period, the formal data analysis was conducted from February 2025 to April 2025. This timeline ensured that all 90-day postoperative outcomes, including readmissions and delayed complications, were fully documented before the final statistical processing began.

The study flow began with a total of 144 patients included based on their initial clinical presentation and nutritional risk. Of these, 142 patients were randomized to one of the two nutritional intervention arms. The trial experienced a 17% dropout rate after the randomization phase, as 24 patients were removed from the study. This attrition resulted in a final cohort of 118 patients for analysis, which was distributed with high precision between the study groups. The final dataset comprised 59 patients in the early enteral nutrition group and 59 patients in the oral nutrition group, ensuring an equal balance for the comparison of the comprehensive complication index and other secondary clinical endpoints.

Quantifying the Reduction in Complication Burden

The researchers designated the primary outcome as complications at 90 days postoperatively, which they measured using the mean comprehensive complication index. This metric is a statistical scale that integrates all postoperative complications and their individual severity into a single numerical value (ranging from 0 to 100), providing a more nuanced view of the patient's surgical recovery than a simple binary assessment of whether a complication occurred. By utilizing this index, the study could capture the cumulative physiological burden of multiple minor events alongside major surgical setbacks, offering a more accurate reflection of the total morbidity experienced by the patient.

The analysis of the 118 patients revealed that the early enteral nutrition group had a lower mean 90-day comprehensive complication index compared with the oral nutrition group. Specifically, patients receiving immediate tube feeding recorded a mean score of 25.5 (standard deviation [SD], 21.1), whereas those in the oral nutrition arm had a mean score of 35.8 (SD, 25.2). This reduction indicates that while complications still occurred in both cohorts, the overall severity and cumulative impact of these events were notably diminished in patients who received early nutritional support via nasojejunal tube.

The statistical analysis confirmed the clinical significance of this finding, showing a mean difference in the comprehensive complication index of 10.3 (95% CI, 1.8-18.8; P = .02). For the practicing clinician, this 10.3-point difference suggests that early enteral nutrition does not merely prevent isolated events but rather shifts the entire postoperative trajectory toward a lower total burden of illness. While the study found no significant differences in the rates of specific complications such as pancreatic fistula or delayed gastric emptying, the aggregate reduction in the complication index underscores the systemic benefit of maintaining nutritional status immediately following major pancreatic resection.

Secondary Outcomes and Safety Considerations

While the primary outcome focused on the cumulative burden of illness, the researchers also evaluated a wide range of secondary endpoints to determine if early enteral nutrition influenced specific clinical events. These secondary endpoints included overall, minor, and major morbidity rates, mortality, and the incidence of delayed gastric emptying. The study also tracked surgical complications such as pancreatic fistula, postoperative hemorrhage, and surgical site infections, alongside systemic issues including infectious complications, pulmonary complications, length of stay, and 90-day readmission. Despite the reduction in the total complication burden observed via the comprehensive complication index, the raw incidence of morbidity did not show a statistically significant divergence between the two cohorts. At 90 days, overall morbidity rates were 45 of 59 in the early enteral nutrition group compared to 51 of 59 in the oral nutrition group, resulting in a risk ratio of 1.13 (95% CI, 0.9-1.9; P = .18).

The analysis further demonstrated that the intervention did not specifically alter the frequency of the most common surgical setbacks associated with pancreatoduodenectomy. Specifically, no difference was found between groups regarding specific complications including delayed gastric emptying, pancreatic fistula, postoperative hemorrhage, and surgical site infection. This suggests that the benefit of early enteral nutrition may be more systemic than localized to the surgical site. Clinicians should also consider the practical management of the feeding apparatus; in this trial, the nasojejunal tube was replaced in 14 patients in the early enteral nutrition group due to involuntary removal, which was recorded as an adverse event. These findings indicate that while early tube feeding effectively lowers the total physiological stress of postoperative complications, it requires diligent tube maintenance and does not eliminate the baseline risk of major surgical events like fistulas or hemorrhage.

Clinical Implications for High-Risk Patients

The findings of this randomized clinical trial provide a clear directive for the perioperative management of patients undergoing complex pancreatic surgery. The researchers concluded that in patients with a nutritional risk screening score of 3 or more, a metric used to identify those at high risk for malnutrition related complications, the implementation of early enteral nutrition after pancreatoduodenectomy decreased the burden and incidence of postoperative complications when compared with oral nutrition alone. This reduction in morbidity is clinically significant for the practicing surgeon, as it suggests that the physiological stress following a major resection can be mitigated by immediate, targeted nutritional support. While the raw incidence of specific surgical complications like pancreatic fistula or hemorrhage remained similar between groups, the overall severity and cumulative impact of all postoperative events were lower in the cohort receiving tube feeding.

For clinicians, these results emphasize the importance of preoperative screening to identify the subset of patients who will benefit most from aggressive nutritional intervention. In this study, the early enteral nutrition group achieved a mean 90-day comprehensive complication index of 25.5 (SD 21.1), which was significantly lower than the 35.8 (SD 25.2) observed in the oral nutrition group, representing a mean difference of 10.3 (95% CI 1.8-18.8; P = .02). This suggests that while oral intake remains the standard for many, the 'burden' of recovery is substantially lightened by early enteral nutrition in malnourished patients. Surgeons should consider the routine placement of a nasojejunal tube during the index operation for any patient meeting the nutritional risk threshold, as this proactive approach addresses the systemic vulnerabilities that lead to a higher cumulative complication profile during the 90-day postoperative period.

References

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3. Bayramov N, Mammadova S. A review of the current ERAS guidelines for liver resection, liver transplantation and pancreatoduodenectomy. Annals of Medicine and Surgery. 2022. doi:10.1016/j.amsu.2022.104596

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