Postoperative liver dysfunction in living donors after left-sided graft hepatectomy: Portal venous occlusion of the medial segment after lateral segmentectomy and hepatic venous congestion after left lobe hepatectomy

Background: The aim of this study was to evaluate how sacrifice of the portal vein and/or hepatic vein affects remnant liver dysfunction after lateral segmentectomy or left lobe hepatectomy. Materials and methods: Among 130 patients who underwent donor hepatectomy between March 2002 and July 2011, we enrolled lateral segment (n = 15) and left lobe donors (n = 40). We evaluated the postoperative courses and the territory of venous obstruction or congestion based on the sacrificed portal vein or hepatic vein after the donor operation: lateral segment grafts (P4a, P4b, LV4) and left lobe grafts (MV5, MV8) according to the results analyzed by MeVis Distant Service. Results: Among lateral segment donors, the predicted sacrificed territory of portal vein and hepatic vein was 14.3% (7.3%19.4%) in P4a + 4b: (P4a: 8.6%, P4b: 5.8%) and 2.9% (0%8.4%) in LV4, respectively. On the other hand, in left lobe donors, the predicted congestive territory of the hepatic vein was 17.6% (2.8%33.0%) in MV5 + 8 (7.8% in MV5 and 9.8% in MV8, respectively). The incidence of patients whose postoperative peak aspartate aminotransferase (AST) or alanine aminotransferase levels were higher than 500 IU/L was 20% in the lateral segment donors and 5% in the left lobe donors. The peak postoperative AST levels and territory of MV5 + 8 showed a significant positive correlation (R = 0.569, P <.05) among left lobe donors. Conclusion: Territories of P4 in lateral segment donors and MV5 + 8 in left lobe donors impacted postoperative liver dysfunction. It is important to recognize the precise territory of the portal vein and the hepatic vein before the donor operation.