Bloomston, Mark P.

Objective: To investigate the role of intraoperative estimated blood loss (EBL) on development of clinically relevant postoperative pancreatic fistula (CR-POPF) after pancreatoduodenectomy (PD). Background: Minimizing EBL has been shown to decrease transfusions and provide better perioperative outcomes in PD. EBL is also felt to be influential on CR-POPF development. Methods: This study consists of 5534 PDs from a 17-institution collaborative (2003–2018). EBL was progressively categorized (≤150mL; 151–400mL; 401–1,000 mL; > 1,000 mL). Impact of additive EBL was assessed using 20 3– factor fistula risk score (FRS) scenarios reflective of endogenous CR-POPF risk. Results: CR-POPF developed in 13.6% of patients (N = 753) and median EBL was 400 mL (interquartile range 250-600 mL). CR-POPF and Grade C POPF were associated with elevated EBL (median 350 vs 400 mL, P = 0.002; 372 vs 500 mL, P < 0.001, respectively). Progressive EBL cohorts displayed incremental CR-POPF rates (8.5%, 13.4%, 15.2%, 16.9%; P < 0.001). EBL >400mL was associated with increased CR-POPF occurrence in 13/20 endogenous risk scenarios. Moreover, 8 of 10 scenarios predicated on a soft gland demonstrated increased CR-POPF incidence. Hypothetical projections demonstrate significant reductions in CR-POPF can be obtained with 1–, 2–, and 3-point decreases in FRS points attributed to EBL risk (12.2%, 17.4%, and 20.0%; P < 0.001). This is especially pronounced in high-risk (FRS7–10) patients, who demonstrate up to a 31% reduction (P < 0.001). Surgeons in the lowest-quartile of median EBL demonstrated CR-POPF rates less than half those in the upper-quartile (7.9% vs 18.8%; P < 0.001). Conclusion: EBL independently contributes significant biological risk to CR-POPF. Substantial reductions in CR-POPF occurrence are projected and obtainable by minimizing EBL. Decreased individual surgeon EBL is associated with improvements in CR-POPF.