[Changes of serum and urinary uric-acid levels after portacaval anastomosis in the rat].

Significantly higher levels of uric acid in serum and urine together with increased urine volume and pH were observed in rats after portacaval end-to-side anastomosis in comparison to sham-operated and non-operated pair-fed controls. An increased supply of endogenous uric acid by reduced transformation of uric acid to allantoin and decreased uricase activity in the liver was assumed. Adaptation of enzyme activities of other metabolic pathways of the liver after PCA due to diminished blood and oxygen supply were described in previous experiments. This model seems suitable for other studies on hyperuricemia, hyperuricosuria and uric acid lithiasis.