L Xiang1, L Huang1, X Wang2, Y Zhao1, Y Liu1, J Tan3. 1. Animal Experiment Centers, Chinese PLA General Hospital, Beijing, People's Republic of China. 2. Beijing Vital River Laboratory Animal Technology, Beijing, People's Republic of China. 3. Department of Hepatobiliary Surgery, Hainan Hospital and Chinese PLA General Hospital, Beijing, People's Republic of China. Electronic address: tanjingwang02@aliyun.com.
Abstract
BACKGROUND: There is increasing evidence that the occurrence of small-for-size syndrome (SFSS) depends on portal hemodynamics rather than graft size. The portal hyperperfusion has been regarded as the most important contributing factor to SFSS. However, it is unknown how much portal vein flow (PVF) or what limit of PVF the liver remnant can sustain in extreme hepatectomy. This study aimed to evaluate the limit of portal hyperperfusion in a stable porcine model. METHODS: Twenty pigs were subjected to different liver resection volumes of 77%-82% (80% group; n = 6), 83%-87% (85% group; n = 7), and 88%-92% (90% group; n = 7). The survival rate, hemodynamic change, energy metabolism, lipopolysaccharide (LPS)/bacterial translocation, and injury and regeneration of the residual liver were observed after surgery. RESULTS: All of the 80% group could sustain ∼4 times baseline PVF per unit volume, energy metabolism, and detoxifying functions, and survived to postoperative day (POD) 14. Only 3 animals in the 85% group, with ∼5.6 times baseline of PVF, were alive on POD 14, and in the 90% group, with >6 times baseline of PVF, undergoing severe hyperperfusion injury and LPS/bacterial translocation, none survived to POD 14. CONCLUSIONS: The deaths of animals in the 85% group supports the hypothesis that the remnant vascular bed with 15% of liver volume represents a critical residual liver parenchyma in pigs, the safe minimum residual liver volume should be >15% of liver volume, indicating that the liver remnant can regenerate successfully in ∼5.6 times baseline of PVF, whereas it fails to regenerate in >5.6 times baseline of PVF.
BACKGROUND: There is increasing evidence that the occurrence of small-for-size syndrome (SFSS) depends on portal hemodynamics rather than graft size. The portal hyperperfusion has been regarded as the most important contributing factor to SFSS. However, it is unknown how much portal vein flow (PVF) or what limit of PVF the liver remnant can sustain in extreme hepatectomy. This study aimed to evaluate the limit of portal hyperperfusion in a stable porcine model. METHODS: Twenty pigs were subjected to different liver resection volumes of 77%-82% (80% group; n = 6), 83%-87% (85% group; n = 7), and 88%-92% (90% group; n = 7). The survival rate, hemodynamic change, energy metabolism, lipopolysaccharide (LPS)/bacterial translocation, and injury and regeneration of the residual liver were observed after surgery. RESULTS: All of the 80% group could sustain ∼4 times baseline PVF per unit volume, energy metabolism, and detoxifying functions, and survived to postoperative day (POD) 14. Only 3 animals in the 85% group, with ∼5.6 times baseline of PVF, were alive on POD 14, and in the 90% group, with >6 times baseline of PVF, undergoing severe hyperperfusion injury and LPS/bacterial translocation, none survived to POD 14. CONCLUSIONS: The deaths of animals in the 85% group supports the hypothesis that the remnant vascular bed with 15% of liver volume represents a critical residual liver parenchyma in pigs, the safe minimum residual liver volume should be >15% of liver volume, indicating that the liver remnant can regenerate successfully in ∼5.6 times baseline of PVF, whereas it fails to regenerate in >5.6 times baseline of PVF.
Authors: Eva-Maria Wittauer; Felix Oldhafer; Eva Augstein; Oliver Beetz; Moritz Kleine; Carsten Schumacher; Lion Sieg; Hendrik Eismann; Kai Johanning; André Bleich; Florian Wolfgang Rudolf Vondran Journal: PLoS One Date: 2019-05-31 Impact factor: 3.240