To clarify the D-lactate metabolism in patients with chronic renal failure undergoing CAPD, plasma levels, loaded doses and urinary excretion of D-lactate were measured. In addition, D-2-hydroxy acid dehydrogenase activities in resected and autopsied specimens were measured. The daily loaded dose of D-lactate by CAPD was 88.9 ± 1.29 mmol and urinary excretion was negligible. There was no tendency for the plasma D-lactate to accumulate. The enzyme activity was detected in the liver, kidney and pancreas tissues both in the resected and autopsied specimens. The above findings indicate that the loaded Z)-lactate is catabolized in patients with chronic renal failure undergoing CAPD, and D-2-hydroxy acid dehydrogenase is responsible for the metabolism of D-lactate in humans.

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