REDUCTION OF THE HEART RATE VARIABILITY IN HYPERTROPHIC NON-OBSTRUCTIVE CARDIOMYOPATHY
We examined 53 patients with hypertrophic non-obstructive cardiomyopathy (HNCM) assessing the heart rate variability (HRV) using Holter monitoring and echocardiography according to the standard procedure. There was a reduction of the power of very low (humoral component) and low (the sympathetic component) frequencies of HRV spectrum, especially in the presence of cardioalgia and angina. In 62.2 % of patients there was a decline of the main indicators of HRV below "cut points", which was accompanied by a decrease in the high-frequency (parasympathetic) component of HRV. The reduction of HRV parameters below the "cut points" was associated with a more severe clinical picture of the disease; death from cardiovascular causes was noted only in this group of patients.