[Electroencephalography in aneurysms of the internal carotid artery during endovascular operations]

The authors studied the functional condition of the brain in patients with arterial aneurysms of the internal carotid artery in different stages of treatment by the endovascular method with the use of a balloon catheter. From experience in 122 cases it is shown that complex neurological and electrophysiological examination must be conducted before, during, and after the operation. It is established that EEG allows changes of brain activity to be revealed earlier than the neurological signs of circulatory deficit occur. They are detected for a longer period also during the restoration of cerebral functions. In view of this, EEG helps in appraising the state of cerebral collateral circulation (Matas' test, functional occlusion of the vessel during the operation), choice of the policy of the endovascular intervention, and prognosis of possible complications.