Cerebral blood flow and cerebrovascular reactivity in patients with chronic cardiac failure with various types of disfunction of the left ventricle myocardium (systolic and diastolic disfunction) are studied. Blood flow in vertebrobasilar pool vessels was decreased in all patients with both the systolic and the diastolic component of the blood flow linear velocity. The cerebrovascular reactivity coefficient on hypercapnic test was also reliably decreased, suggesting the insufficiency of adaptive possibilities of the regulation system of cerebral blood flow in chronic ischemia. Systolic and diastolic components of the blood flow linear velocity in vertebrobasilar pool arteries were decreased in patients with diastolic disfunction of myocardium as in the group in total. Carotid pool arteries suffered to a lesser degree. The signs of chronic cerebral ischemia estimated in transcranial dopplerography were observed in patients with chronic cardiac failure even in the absence of rough organic changes in the nervous system.