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The tissue levels of coenzyme Q10 (CoQ10) in endomyocardial biopsy samples and blood from 43 patients with cardiomyopathy were determined by steps of extraction, purification, and HPLC. The biopsy samples were obtained from the patients after a routine heart catheterization. Six patients were of class I, 18 of class II, 11 of class III, and 8 of class IV (classified according to guidelines of the New York Heart Association). True control biopsies of healthy hearts are not available for ethical reasons, but the data of the four classes by severity of disease may be justifiably compared. Patients of class IV had lower (P less than 0.01) levels of CoQ10 than those of class I. Patients of classes III and IV had a lower (P less than 0.0001) level than those of classes I and II. Biopsy samples were obtained from five patients after treatment with CoQ10 for 2-8 months. The increases of CoQ10 levels ranged from 20% to 85%; the mean value was higher (P less than 0.02) than before treatment. Blood deficiencies also increase with severity of disease, but not as markedly as for the biopsies. These data reveal a myocardial deficiency of CoQ10, which is higher with increasing severity of disease and is reduced by therapy. This biochemistry correlates with the effective treatment of cardiomyopathy with CoQ10.

Biochemical rationale and myocardial tissue data on the effective therapy of cardiomyopathy with coenzyme Q10.