Chyle leak after pancreatic surgery: validation of the International Study Group of Pancreatic Surgery classification

Background: Chyle leak is an uncommon complication after pancreatic surgery. The chyle leak incidence, definition, diagnosis, and treatment had been reported heterogeneously so far. Recently a consensus definition and grading system was published by the International Study Group for Pancreatic Surgery. This study aims to evaluate the differences in the clinical and economic burden of chyle leak applying the new definition. Methods: All data from patients who underwent pancreatic surgery for any disease from January 2014 to December 2016 were retrieved from the institutional prospective database. The 2017 International Study Group for Pancreatic Surgery definition and classification were applied. The classification was validated analyzing the differences in major complications, length of stay, and hospitalization costs. Results: A total of 945 patients was the final population. A chyle leak was reported in 43 patients (4.5%). Grade A chyle leak occurred in 10 patients (23.3%), Grade B chyle leak in 31 patients (72.1%), and Grade C chyle leak in 2 patients (4.6%). Chyle leak occurred as unique postoperative complication in 29 cases (67.4%). The economic analysis showed that the average costs of the 3 grades were 2,806, 7,150 and 15,684 euros respectively (P <.001). Furthermore, the length of stay, the rates of septic events, and major complications were significantly different among the 3 grades (P =.008, P =.004, and P <.001, respectively). Of note, we did not find any intraoperative factor associated with chyle leak. Conclusion: The present study confirms the validity of the International Study Group for Pancreatic Surgery classification of chyle leak. The 3 grades of chyle leak proposed identify reliably clinical and economical differences among the chyle leak cases