Hepatic ischaemia and reperfusion injury, as seen during hepatic transplantation, has not been completely understood. Several experimental models have been proposed for studies on pathophysiology and modulation of such condition. Recently, in dogs, partial hepatic devascularization (30%) with splancnic venous decompression using translobar venous route of intact lobes (70%) has been proposed. Inthe present paper , a larger hepatic mass (70%) has been devascularized in 10 dogs submitted to splancnic venous decompression through caudate and right lateral lobes (30%), during the ischaemic period( Test Group), followed by reperfusion. Ten others animals were submitted to a sham operation( Control Group). The results indicated, with a confidence level of 95% that: 1. During the period of ischaemia it was demonstrated maintenance of MAP and CVP levels, elevation of PP values similar to that seen with bypass, core temperature (CT) decrease that never reached limits under the mean value of 36oC, absence of metabolic acidosis or elevation of enzyme levels (AST, ALT and DL), occurrence of hepatic necrosis (HN) and fall in hepatic glycogen content (HGC); 2. After reperfusion, reduced values of MAP, absence of significant differences in CVP levels, persistent elevations of PP, progressive decreases in CT levels, presence of metabolic acidosis (¯ pH, ¯ DB), progressive elevations of aminotranspherases (AST, ALT) , lactic dehidrogenase (LD) and hepatic necrosis (HN), and progressive decline of hepatic glycogen content (HGC) were verified. These results suggest that the proposed model may be useful for studies on pathophysiology and pharmacologic modulation of liver ischaemia and reperfusion injury , using a larger hepatic mass.
Liver; Ischaemia; Reperfusion; Experimental model; Hemodynamics; Core temperature; Acid-base balance; Hepatic enzymes; Histology; Dog
