This article describes the definition of the state of the autonomic nervous system in patients with chronic cerebral ischemia and chronic heart failure. It has been established that in patients with a reduced left ventricular ejection fraction was recorded the prevalence of the sympathetic link of the autonomic nervous system. Since the activation of the sympathetic nervous system is often a predictor of the development of diseases of the cardiovascular system, the detection of an increase in the activity of the sympathetic department of the autonomic nervous system in the early stages is one of the key moments in preventing the progression of diseases of the cardiovascular system.
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