SummaryBackground: In the early asymptomatic stages of cardioniyopathy in chronic Chagas' disease, septa1 endomyocardial biopsies disclose multiple evidence of evolving myocardial damage. Detection of signs of an active myocardiopathic process may allow a better understanding of the evolution of this and other related dilated cardiomyopathies and provide a means for evaluation of the result of future therapeutic schemes.Hypothesis: This study was designed to explore whether cellular damage caused by Chagas' disease is reflected by changes of certain serum electrolytes, enzymes, and glycoproteins associated with myocardial metabolism, especially in the coronary sinus into which the blood just metabolized by the heart is drained.Merhods: The study included 47 patients (35 men and 12 women, average age 40 years) with positive complement fixation reaction and hemagglutination test for Chagas' disease. The study protocol included medical records, electrocardiographic (ECG) recordings, routine laboratory analysis, chest x-rays, noninvasive cardiac examinations, and cardiac catheterization.Results: In this study, we determined the concentration or activity of 9 electrolytes, 5 glycoprotein fractions, and 12 enzymes related to cardiac metabolism in blood from the coronary sinus, the superior vena cava, the pulmonary and femoral
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