[Electroencephalographic surveillance during carotid endarterectomy].

Continuous EEG monitoring during 110 carotid endarterectomies showed transient or permanent abnormalities in 35 cases. In 13 cases, these abnormalities occurred during carotid clamping and led the surgeon to place a shunt in 8 cases. In 22 cases, electrical abnormalities of various types appeared outside the clamping period. Continuous EEG monitoring demonstrated that cerebral disturbances can occur at any time during the operative period. Thus, intra-operative EEG monitoring allows a better understanding of clinical signs which may be seen postoperatively.