[The noninvasive assessment of intracranial hemodynamics by transcranial dopplerography].

Transcranial dopplerography investigations of intracranial hemodynamics in healthy subjects and patients with occlusion of the internal carotid artery, in compression tests of common carotid artery made it possible to evaluate the function of the circle of Willis anterior and posterior communicating arteries with determination of the sources of collateral compensating blood flow. A significant slowing down of the flow (p < 0.05) along the middle and anterior meningeal arteries occurs with aging. In unilateral occlusion of the internal carotid artery collateral blood flow takes place in intracranial shunts of the anterior and posterior parts of the circle of Willis, in bilateral occlusion--in posterior parts of the circle and natural extra- and intracranial shunts via ophthalmic artery system.