An unusual case of endomyocardial fibrosis is reported complicating an idiopathic hypereosinophilic syndrome. Persisting hypereosinophilia, degranulated eosinophils in the blood, and myocardial activity have been found accompanying the fibrotic phase of endomyocardial disease. This occurrence supports the unitarian theory on tropical and temperate endomyocardial disease and suggests in such a condition the use of steroids or cytotoxic drugs in addition to surgery.
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