Relation between the middle hepatic vein drainage area volume and alanine aminotransferease after left liver harvesting.

Complete outflow is impossible to maintain on both sides in donors undergoing hemiliver graft harvesting, because the middle hepatic vein (MHV) can be preserved on only one side. The area in which outflow veins are disrupted becomes congested and does not sufficiently regenerate. The relation between changes in alanine aminotransferase (ALT) and the congestive area volume of the congestive area is unknown. The 64 subjects presented herein were living donors who provided the left liver with the caudate lobe and MHV trunk. The midpoint between the tributaries of the MHV and the right hepatic vein was determined preoperatively using computed tomography. The midpoint between the tributaries of the MHV and right hepatic vein and the borderline between the right and left liver were used to predict the MHV drainage area volume. ALT was measured in donors on postoperative days 1, 3, 5, 7, 10, and 14. The patients were divided into three groups according to the ratio of calculated MHV drainage area volume in the remnant right liver: less than 15% (n = 21, group A); greater than 15% and less than 20% (n = 18, group B); greater than 20% (n = 25, group C). There were significant differences in the ALT levels between groups (P = .004). MHV drainage area volume, calculated using the present method, was associated with high ALT levels after left liver harvesting with the MHV. The present study suggests that persistently high ALT levels are associated with the volume of the interrupted MHV drainage area.