Hepatocellular uptake index obtained with gadoxetate disodium-enhanced magnetic resonance imaging in the assessment future liver remnant function after major hepatectomy for biliary malignancy

Background Functional assessment of the future liver remnant (FLR) after major hepatectomy is essential but often difficult in patients with biliary malignancy, owing to obstructive jaundice and portal vein embolization. This study evaluated whether a novel index using gadoxetate disodium-enhanced MRI (EOB-MRI) could predict posthepatectomy liver failure (PHLF) after major hepatectomy for biliary malignancy. Methods The remnant hepatocellular uptake index (rHUI) was calculated in patients undergoing EOB-MRI before major hepatectomy for biliary malignancy. Receiver operating characteristic (ROC) curve analyses were used to evaluate the accuracy of rHUI for predicting PHLF grade B or C, according to International Study Group of Liver Surgery criteria. Multivariable logistic regression analyses comprised stepwise selection of parameters, including rHUI and other conventional indices. Results This study included 67 patients. The rHUI accurately predicted PHLF (area under the curve (AUC) 0.896). A cut-off value for rHUI of less than 0.410 predicted all patients who developed grade B or C PHLF. In multivariable analysis, only rHUI was an independent risk factor for grade B or C PHLF (odds ratio 2.0 × 103, 95 per cent c.i. 19.6 to 3.8 × 107; P < 0.001). In patients who underwent preoperative portal vein embolization, rHUI accurately predicted PHLF (AUC 0.885), whereas other conventional indices, such as the plasma disappearance rate of indocyanine green of the FLR and FLR volume, did not. Conclusion The rHUI is potentially a useful predictor of PHLF after major hepatectomy for biliary malignancy.

Institutional actual utilization of postoperative mortality using nationwide survey based risk calculator in patients who underwent major hepatectomy

Background: Relationship between outcomes of major hepatectomy and the mortality rate predicted by National Clinical Database risk calculator (NCD-RC) was examined . Methods: Patient demographics and postoperative morbidity and mortality were compared between 30-day and in-hospital mortality rates among 55 patients who underwent major hepatectomies . The cut-off value for high-risk mortality was set at 5%. Patients were divided into four groups: A) no severe complications and low predictive mortality rate (woML) , B) severe complications or mortality, and low mortality rate (wML) , C) no severe complications and high mortality rate (woMH) , and D) severe complications or mortality, and high mortality rate (wMH) . Results: Morbidity higher than CD III occurred in 17 patients (28%) and 30-day and in-hospital mortality in none and two (3%), respectively. The in-hospital mortality rate was significantly higher for male patients (p<0.01). Age, elderly patients, diseases, and co-morbidity did not significantly differ among groups. Although bile leakage was common in group wML , there were no in-hospital deaths. All surgical procedures performed in group wMH were right hepatectomy with bile duct resection (RH-BDR) for biliary malignancy, and two died of hepatic failure; however, the incidence of RH-BDR was not significantly higher than those in other groups. Conclusions: Preoperative mortality rate predicted by NCD-RC was not always consistent with outcomes in actual clinical settings and further improvements are needed. In case of RH-BDR for biliary malignancy with high predictive mortality rate, careful decision making for liver function and perioperative management are required.

Does Risk Calculator by Nationwide Survey Match The Postoperative Outcome in Patients Who Underwent Major Hepatectomy?

Background: To clarify significance of the present National Clinical Database risk calculator (NCD-RC) for hepatectomy in Japan, relationship between perioperative parameters or outcomes in major hepatectomy and the mortality rate by NCD-RC was examined. Methods: Patient demographics, co-morbidity, surgical records, postoperative morbidity or mortality were examined and compared to the 30 days- or in-hospital-mortality rate among 55 patients with hepatobiliary diseases who underwent hemi- or more-extended hepatectomy and central (segment 458) hepatectomy. The cut-off percent for high risk mortality before hepatectomy was set at 5% in this period. Results: In-hospital morbidity over CD III was 17 (28%), The 30-day mortality and in-hospital mortality was nil and two (3%), respectively. Male patient showed significantly higher in-hospital mortality rate (p<0.01). In the 37 patients (group woML), mean age was 67.8±8.7 years old ranging 45 and 84. Others included A) with severe complications or mortality in whom low mortality rate (group wML, n=13), B) without severe complications neither mortality in whom high mortality rate (group woMH, n=7), and C) with severe complications or mortality in whom high mortality rate (group wMH, n=4 (6.5%)). Age, distribution of elderly patients, gender, the hepatobiliary diseases and the prevalence of preoperative co-morbidity were not significantly different between groups. In the group wML, the bile leakage was dominant and, however, the in-hospital death was not observed. In the group wMH, all operations were right hepatectomy with bile duct resection (RH-BDR) for biliary malignancy and two died of hepatic failure and, however, the prevalence of RH-BDR was not significantly higher in comparison with other groups. Conclusions: Predictive mortality rate by risk calculator under nationwide survey did not always match with patient outcomes in the actual clinical setting and further improvement will be required. In case of RH-BDR for biliary malignancy with high predictive rate, the careful perioperative managements is important under the present nationwide database.