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concomitant biliary enteric anastomoses or colectomy were excluded. Patients having radiofrequency ablation (RFA) or microwave ablation (MA) were compared over time by control charts. RFA and MA patients were propensity score matched based on their age, race, disseminated cancer, operative approach, hepatectomy extent and perioperative transfusions. Outcomes were compared by chi-square and Mann-Whitney U tests. Results: Of 1,589 patients undergoing concomitant hepatectomy and ablation, 964 (60%) had RFA and 635 (40%) receive MA. Control chart analysis over 16 quarters demonstrated no change in the frequency of RFA with an average of 60 procedures per quarter. In comparison, the quarterly frequency of MA increased from a low of 21 to a high of 79 (p<0.05). After matching, RFA and MA patients had similar mortality, serious morbidity, bile leaks, post hepatectomy liver failure (PHLF), organ space infections (OSI), reoperations and length of stay (Table). However, MA was associated with lower rates of deep vein thrombosis (DVT) and sepsis (each p<0.05). Conclusion: In recent years microwave ablation (MA) is being utilized more frequently in patients undergoing hepatectomy while concomitant radiofrequency ablation (RFA) rates have not changed. MA is associated with fewer postoperative deep vein thrombosis and lower rates of procedure related sepsis.

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