[Contribution of the electroencephalogram to the diagnosis of vasospasm after rupture of intracranial aneurysms]. / Apport de l'électroencéphalogramme au diagnostic de vasospasme après rupture d'anévrisme intra-crânien.

ABSTRACT

This study concerns 74 patients with subarachnoid haemorrhage from ruptured supratentorial aneurysm--Serial electroencephalographic recordings (EEG) have been made with precise chronology. The first EEG (Day 1 or 2) had a prognostic value, good if it was normal, alarming if axial bursts or comatose patterns were recorded. Associated with CT scan and dosage of Fibrin degradation products in C.S.F. (F.D.P.), initial EEG gave a strong probability in predicting the occurrence of secondary ischemia. The second EEG, between Day 4 and Day 7, had a diagnostic value. When a vasospasm occurred, confirmed by further angiography, focal or unilateralized slow waves were recorded in more than 85% or these EEG. Further EEG gave the opportunity of controlling the evolution of ischemic electrical patterns.