[Transcranial dopplerography in chronic disorders of cerebral circulation].

Forty one 41-82 year-old patients with chronic cerebrovascular diseases were examined neurologically, using ultrasonic dopplerography (USD) of extracranial cerebral vessels and transcranial dopplerography (TCD) of intracranial cerebral vessels. Changes of the blood flow through major cerebral arteries as well as peculiarities of the venous circulation were evaluated. A significant decrease of the cerebral blood flow velocity (BFV) was found by TCD on early stages of cerebrovascular diseases, while USD revealed it on the III stage of dyscirculatory encephalopathy. The changes in the regulation of the venous circulation increase from latent to obvious alterations of both BFV and the pulsatility index. The conclusion is made that manifestation of clinical symptomatology in the diseases studied is undoubtedly connected with cerebral ischemia and TCD plays an important role in its determination.