[Difficulties in diagnosis of infectious-allergic myocarditis].

The work is based on observations over 168 patients with infectious-allergic myocarditis. The principal clinical, instrumental-laboratory, and morphologic criteria of this disease are discussed. The contractile function of the myocardium and central hemodynamics were studied. Intravital puncture biopsy of the myocardium was employed for the first time in this disease. Clinico-morphologic variants of infectious-allergic myocarditis are distinguished.