Portal triad clamping was first described by Pringle in 1908 as a mean of reducing bleeding from the cut surface of the liver during parenchymal resection. More recently some studies have reported that one period of portal triad clamping could be well tolerated for a longer duration, 60~90 minutes. The liver, generally, is believed to be very sensitive to anoxic damage and susceptible to ischemia and decreased hepatic energy charge results in decreasing arterial ketone body ratio (AKBR) during portal triad clamping.

In order to observe an adverse effects to liver in 30 minutes and 60 minutes of portal triad clamping on AKBR and histologic changes,rabbits were divided into thirty minutes of portal triad clamping in one group (Group I) and 60 minutes of that in the other group (Group II).

During clamping, the mean AKBR of group I and II were 0.39 and 0.44, and decreased significantly compared with the mean AKBR (1.08 and 1.02) before clamping. Five minute after declamping, the mean AKBR of group II (0.49) was lower (P<0.05) than that of group I (0.63), but 30 minutes afterdeclamping, the AKBR of two groups had little difference (group I ; 0.57, group II 0.59, P>0.05). Under light microscopic examination of liver biopsy, there was no visible diffrences between two groups during clamping, 5 minutes and 30 minutes after declamping.

It was concluded that there was no difference in hepatic energy change(AKBR) and histologic change under light microscopy after 30 minutes declamping between two groups.