Abstract
As a collaborative research project of the Committees for the Study of Idiopathic Cardiomyopathy, a questionnaire was sent out to 19 medical institutions in Japan in order to examine the possible association between hepatitis C virus (HCV) infection and cardiomyopathies. Hepatitis C virus antibody was found in 74 of 697 patients (10.6%) with hypertrophic cardiomyopathy (mean age, 57.7 years) and in 42 of 663 patients (6.3%) with dilated cardiomyopathy (mean age, 56.5 years); these prevalences were significantly higher than that found in volunteer blood donors in Japan (2.4%, 50-59 years of age, each p<0.0001). The prevalence was significantly higher in patients suffering from hypertrophic cardiomyopathy as opposed to those with dilated cardiomyopathy (p<0.01). The presence of HCV antibody was detected in 650 of 11,967 patients (5.4%) patients seeking care in 5 academic hospitals. Various cardiac abnormalities were found among these patients, arrhythmias being the most frequent. These observations suggest that HCV infection is an important cause of a variety of otherwise unexplained heart diseases.
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