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Dilated cardiomyopathy, potentially caused by myocarditis, has a poor prognosis in Japan. Research shows a 5-year survival rate of 54.3% for dilated cardiomyopathy versus 92% for hypertrophic cardiomyopathy.
Area of Science:
- Cardiology
- Pathology
- Virology
Background:
- Research into idiopathic cardiomyopathy in Japan began in 1974.
- Myocarditis is a suspected cause of dilated cardiomyopathy, with challenges in viral etiology determination.
- Endomyocardial biopsy is increasingly used for accurate diagnosis.
Purpose of the Study:
- To assess the prognosis of dilated and hypertrophic cardiomyopathy.
- To analyze survival rates based on cardiomyopathy type.
Main Methods:
- A 1983 study by the Idiopathic Cardiomyopathy Research Committee.
- Analysis of 1255 patients: 786 with hypertrophic and 469 with dilated cardiomyopathy.
Main Results:
- Dilated cardiomyopathy showed a poor 5-year survival rate of 54.3%.
- Hypertrophic cardiomyopathy had a significantly better 5-year survival rate of 92%.
Conclusions:
- Dilated cardiomyopathy carries a poor prognosis compared to hypertrophic cardiomyopathy.
- Further research is needed to understand the pathogenesis and improve outcomes for dilated cardiomyopathy.
Abstract:
Many experimental and clinical studies have been performed in Japan, since the Idiopathic Cardiomyopathy Research Committee sponsored by the Ministry of Health and Welfare of Japan was organized in 1974. Much interest has been focused on myocarditis as a possible pathogenesis of dilated cardiomyopathy and extensive experimental studies have been performed as well as histopathologic assessment at autopsy or biopsy. In the clinical field, suspected cases of myocarditis are not uncommon, but determination of etiological viruses is quite difficult in most patients except at the acute stage. Therefore, endomyocardial biopsy has been recently introduced in more than 13 institutes in Japan in an effort to obtain more accurate diagnosis. In 1983, the Idiopathic Cardiomyopathy Research Committee performed a study on the prognosis of cardiomyopathy in 1255 patients (786 hypertrophic and 469 dilated). The prognosis of dilated cardiomyopathy was poor, with a 5-year survival rate of only 54.3%. This figure contrasted with the better prognosis in those with hypertrophic cardiomyopathy (92%).