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  • Title: Clofibrate and tiadenol treatment in hyperlipoproteinemias. A comparative trial of drugs affecting lipoprotein catabolism and biosynthesis.
    Author: Sirtori M, Montanari G, Gianfranceschi G, Malacrida MG, Battistin P, Morazzoni G, Tremoli E, Colli S, Maderna P, Sirtori CR.
    Journal: Atherosclerosis; 1983 Nov; 49(2):149-61. PubMed ID: 6365105.
    Abstract:
    Changes in plasma lipoprotein levels and platelet reactivity were evaluated during sequential treatments with clofibrate and tiadenol, two hypolipidemic agents with apparently different mechanisms, in 27 hyperlipoproteinemic patients. The objective of the study was to determine the pattern of plasma lipoprotein variations, induced by a drug mainly affecting lipoprotein catabolism (clofibrate) and by a drug affecting biosynthesis (tiadenol), and to single out-patients specifically responding to either treatment. Both drugs proved significantly active in type IIA and IV hyperlipoproteinemias, not in type IIB. Clofibrate significantly lowered very low density lipoprotein (VLDL) associated cholesterol in all three hyperlipoproteinemia phenotypes, and it also lowered VLDL triglycerides in type IV, while increasing high density lipoprotein (HDL) cholesterol in type IIA patients. Low density lipoprotein (LDL) cholesterol levels were minimally reduced by clofibrate in type IIA (-4%), and increased in types IIB (+ 14.2%) and IV (+ 6.1%) patients. Conversely, tiadenol lowered VLDL cholesterol and triglycerides to a lesser extent, but it did significantly reduce LDL cholesterolemia in type IIA (-17.6%), while increasing HDL cholesterol in type IIB. Statistical evaluation of the results did not permit identification of parameters associated with the response to either drug, although individuals specifically responding to one or the other agent, or to both, were detected in all three phenotypes. The sensitivity to the major platelet aggregating factors, ADP, adrenaline and collagen, was not significantly altered after drug treatments. Evaluation of the hypolipidemic response to agents with different mechanisms may be of help in selecting the best treatment for individual patients.
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