The Effect of Cholestyramine on the Elimination of Cholesterol as Bile Acids in Patients with Hyperlipoproteinaemia Type II and IV

Abstract. The turnover of ¹⁴C-oholic acid and ³H-chenodeoxycholic acid was studied in hyperlipaemic patients before and during treatment with cholestyramine. – In five female patients with hyperlipoproteinaemia type Ila the pool size and turnover of cholic acid as well as the total formation of bile acids were significantly lower than in female normolipae-mic controls. During treatment with cholestyramine, cholic acid synthesis rose 4–18 fold and the turnover of chenodeoxy-cholic acid increased about twice. In three of the patients these changes were associated with a normalization of the serum cholesterol levels. Mainly due to the high turnover of cholic acid, total bile acid synthesis was above the normal range in the five male patients with hyperlipoproteinaemia type IV. During treatment with cholestyramine, the serum lipids and cholic acid formation remained unchanged but the turnover of chenodeoxycholic acid increased by a factor of about two. This resulted in a decrease of the abnormally high initial ratio between the formation of cholic acid and chenodeoxycholic acid. The unequal response to cholest-ramine treatment is taken to be a further indication that hyperlipoproteinaemia type II and type IV are different entities of disease affecting cholesterol and bile acid metabolism.