Refractory heart failure with a poor prognosis is a key feature of dilated cardiomyopathy. Inflammatory cardiomyopathy, often diagnosed via in vivo subendomyocardial biopsy, is considered a potential precursor to dilated cardiomyopathy. The Dallas criteria, applied to morphometric and electron microscopic studies of biopsy samples, are essential for differentiating the features of various inflammatory stages. Building upon these established diagnostic principles, our study integrates immunohistological analysis with measurements of intramyocardial indices and intracardiac hemodynamics.