Evaluation of relations between structural abnormalities and heart rhythm disorders in patients with myocarditis and dilated cardiomyopathy
The purpose of the study was to improve the diagnosis of diffuse myocarditis (DM) and dilated cardiomyopathy (DCM) based on the study of rhythm and conduction disturbances, heart rate variability and structural-functional state of the heart. We examined 75 patients with left ventricular systolic dysfunction with vіbrosa fraction ? 45%, divided into 2 groups: 1st group consisted of 43 patients with clinically suspected myocarditis, 2nd group - 32 patients with dilated cardiomyopathy. All patients underwent the study indicators Holter electrocardiogram data echocardiography and magnetic resonance imaging (MRI) of the heart. As a result of studies it found that DM characteristic MRI changes are swelling and redness in the areas of infarction active inflammatory process, while both are typical DCM diffuse fibrotic changes in the heart muscle, which can be used for differential diagnosis of these diseases. Dilated cardiomyopathy compared with DM is characterized by lower rates of heart rate variability (SDNN and HF/LF 25.7 that 49,8% respectively), which is associated with more frequent development of ventricular arrhythmias and has a clear link with the presence of fibrotic changes in the heart muscle.