Abstract
Circulating immune complexes (CIC) were characterized for the content in IgG, IgA, IgM, C3 and C4 in patients with heart disease. The levels of IgG, IgM and C4 in PEG-precipitates of patients' sera were significantly higher than those found in controls, and the precipitation profile was similar to that of rheumatoid arthritis patients. Differences were observed in the composition of CIC: IgM was highest in association with myocarditis, and C3 predominated in cases of valvular disease. Complex-bound C4 was significantly higher in patients with myocardial infarction which developed pericarditis either early or late in the evolution of the disorder. Antimyocardial antibodies could be detected in sera and in corresponding PEG-precipitates. The bulk of the data suggests that CIC might play a pathogenetic role in various heart diseases.
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