[Diagnostic and prognostic value of endomyocardial biopsy in patients with congestive cardiomyopathy (author's transl)]rdiomyopathy(author. 
Endomyocardial biopsies were obtained from the right ventricle in 25 patients with the clinical diagnosis of congestive cardiomyopathy.  The biopsies were subjected to virological and histological studies (light and electronmicroscopy) and the findings correlated with clinical data.  Abnormal morphological findings were present in all patients.  The presumed clinical diagnosis was confirmed in 19, the morphological changes not being consistent with the clinical diagnosis of CCM in six patients.  Electronmicroscopy revealed cardiac storage disease in one patient and pathological changes secondary to previous myocarditis in the other five.  Clinical follow-up studies of the five patients apparently confirmed the morphological results, because in no case was there clinical deterioration, three patients in fact being in a fairly normal cardiac state at present.  Using a morphological scoring system, the 19 patients with morphologically confirmed diagnosis of CCM were subdivided into two groupds, those with four points or less (group I, n equal to 9), and those with five pints or more (group II, n equal to 10).  During a mean follow-up period of nearly 12 months the first group had a low mortality rate (n equal to 2), while the other had a high one (n equal to 6).  The occurrence of signs of degeneration and mitochondrial alterations, in particular, was associated with a poor clinical prognosis.  This differentiation into two groupds could not be achieved by clinical means alone.  Type B3 Coxsackie virus was isolated from one biopsy, but no patient had significant serological evidence of virological infection.