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( Shozo Mori ),( Hyeyoung Kim ),( Min Su Park ),( Youngrok Choi ),( Geun Hong ),( Nam Joon Yi ),( Kwang Woong Lee ),( Keiichi Kubota ),( Kyung Suk Suh ) 대한간학회 2012 춘·추계 학술대회 (KASL) Vol.2012 No.-
Background: The major premise for a successful adult-to-adult living donor liver transplantation (LDLT) is appropriate liver regeneration of the graft. However, liver dysfunction, also called small-for-size syndrome (SFSS), sometimes develops despite a rapid restoration of liver mass. The aim of this study was to evaluate the impact of the graft regeneration rate on the development of SFSS. Methods: We retrospectively reviewed 35 adult-to-adult LDLT recipients with a graft-to-recipient weight ratio (GRWR) of < 0.8% using 25 right lobe grafts and 10 left lobe grafts. The graft regeneration rate was expressed with the ratio of graft volumes measured by computed tomography at approximately postoperative day 10 to those measured during the operation. The graft dysfunction score (range, 0-3) was calculated as a sum of the presence of hyperbilirubinemia (1), coagulopathy (1), or ascites (1) after surgery, and SFSS was defined as having met all of these criteria. Results: Six recipients developed SFSS. The graft regeneration rate of the SFSS (+) group was higher than the SFSS (-) group (2.12 ± 0.39 vs. 1.70 ± 0.29, p = 0.016). Receiver operating characteristic curve analysis indicated the cut-off value of a graft regeneration rate of 1.86 for the graft dysfunction score. The dysfunction score was positively correlated with the graft regeneration rate (P < 0.01). In the group with a GRWR of < 0.7% (n = 13), 4 of 8 recipients with a graft regeneration rate of ≤ 1.86 developed SFSS, whereas none of the recipients with a graft regeneration rate of > 1.86 developed SFSS. Conclusions: In conclusion, excessive graft regeneration has detrimental effects on hepatic function after LDLT. Keywords: Graft regeneration, small-for-size syndrome, living donor liver transplantation