Evaluation of Pringle maneuver during liver resection in a rat model of surgical obstructive jaundice

Temporary portal triad clamping ( Pringle maneuver) during liver resection reduces intraoperative blood loss. A normal liver can safely tolerate normothermic ischemia for up to 60 min. However, its safety in patients with surgical obstructive jaundice ( SOJ) is not known. Therefore, we investigated the effect of hepatic ischemia in an experimental rat model of SOJ created by ligating the bile duct. Four groups of rats were created: Group I ( sham operation, 10 days later, liver resection); Group II ( sham operation, 10 days later, liver resection with 5 min of hepatic ischemia); Group III ( bile duct ligation, 10 days later, liver resection); and Group IV ( bile duct ligation, 10 days later, liver resection with 5 min of hepatic ischemia). The ischemic injury was assessed by the survival of rats, liver tissue malondialdehyde and total glutathione ( markers of free radical injury), serum alanine aminotransferase, aspartate aminotransferase, and liver histology. The results showed decreased survival ( 47.6% vs. 90% [ p =.046]), increased liver tissue malondialdehyde ( 161 +/- 35 vs. 129 +/- 33 mu g/ gm liver tissue [ p <= 05]), and decreased liver tissue total glutathione ( 565 +/- 169 vs. 1075 +/- 276 nmol/ gm liver tissue [ p <= 05]) in rats with SOJ subjected to hepatic ischemia when compared to nonjaundiced rats. The changes in serum aspartate aminotransferase ( AST), alanine aminotransferase ( ALT), and alkaline phosphatase showed an increasing trend in the SOJ group but were not statistically significant. Ischemic changes in liver histology were seen more often in the SOJ group but were not statistically significant. These data suggest that temporary portal triad clamping in an experimental model of SOJ is detrimental to the outcome of liver resection.