Effect of Middle Hepatic Vein Reconstruction in Living Donor Liver Transplantation Using Right Lobe

Background: This study reviewed the impact of middle hepatic vein (MHV) reconstruction on right lobe graft with regard to functional recovery and graft regeneration at 1 week after transplantation. Materials and methods: From January 1999 to September 2005. 211 adult living donor liver transplantations were performed using the right lobe. The reconstruction of hepatic venous tributaries from segment 5 or segment 8 or both was performed in every cases of sufficient size. The patency of graft vessels was evaluated with computed tomography (CT) angiography on postoperative day 7. We analyzed liver enzymes (aspartate transferase [AST], alanine transferase [ALT] and bilirubin) at 1 week postoperatively and evaluated regeneration activity by CT volumetry at 1 week postoperatively. Results: Among 211 cases, 182 (86.3%) were reconstructed with interpositional MHV grafts. Among them, 51 cases (51.9%) were patent at 1 week postoperatively. The levels of AST and ALT in patent cases of all patients and small-for-size grafts were lower than among the occlusion cases, albeit not significantly. The mean graft regeneration at 1 week postoperatively among patent cases was 1.75 ± 0.39 versus 1.64 ± 0.24 in the occluded cases (P = .111), but among small-for-size grafts, there was a significant difference in graft regeneration between patent versus occluded cases (2.05 ± 0.50 vs 1.66 ± 0.17, P = .037). Conclusion: Functional recovery and graft regeneration in small-for-size grafts showed a beneficial effect in patent cases, compared with occluded cases. Our selection criteria for MHV reconstruction must include cases of small-for-size grafts not all cases.