This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Request Permissions Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Blume, W. T. Articles by McNeill, D. K. Search for Related Content PubMed PubMed Citation Articles by Blume, W. T. Articles by McNeill, D. K.

Stroke, Vol 17, 891-897, Copyright © 1986 by American Heart Association

ARTICLES

Significance of EEG changes at carotid endarterectomy

WT Blume, GG Ferguson and DK McNeill

Visually apparent EEG changes associated with clamping the internal carotid artery appeared in 55 of 176 consecutive patients (31%) undergoing carotid endarterectomy without shunt. Attenuation of higher frequency activity was the most common change. Changes were moderate in 33 patients (19%) and major in 22 (12.5%). Major changes usually commenced earlier than less severe alterations. EEG changes resolved within 10 minutes of clamp release in 36 of 55 patients (65%) after an average clamp time of 36.25 minutes. Changes occurred more commonly when pre-operative EEGs were abnormal contralateral to clamping and when the contralateral carotid artery was more than 90% stenosed. Of the inhalational anesthetics employed with nitrous oxide and oxygen, isoflurane was associated with the lowest incidence of clamp-associated EEG change. Post-operative strokes occurred in 2 of 22 patients (9%) with major clamp-associated EEG changes, none of 33 patients with moderate changes and none of 121 without changes. However, the mechanism of this relationship remains in doubt.

This article has been cited by other articles:

				I. J. Welsby, J. M. Ryan, J. V. Booth, E. Flanagan, R. H. Messier, and C. O. Borel The Bispectral Index in the Diagnosis of Perioperative Stroke: A Case Report and Discussion Anesth. Analg., February 1, 2003; 96(2): 435 - 437. [Abstract] [Full Text] [PDF]

				D. R. Rutgers, J. D. Blankensteijn, and J. van der Grond Preoperative MRA Flow Quantification in CEA Patients : Flow Differences Between Patients Who Develop Cerebral Ischemia and Patients Who Do Not Develop Cerebral Ischemia During Cross-Clamping of the Carotid Artery Stroke, December 1, 2000; 31(12): 3021 - 3028. [Abstract] [Full Text] [PDF]

				M. Arnold, M. Sturzenegger, L. Schaffler, and R. W. Seiler Continuous Intraoperative Monitoring of Middle Cerebral Artery Blood Flow Velocities and Electroencephalography During Carotid Endarterectomy : A Comparison of the Two Methods to Detect Cerebral Ischemia Stroke, July 1, 1997; 28(7): 1345 - 1350. [Abstract] [Full Text]

				T. V Schroeder Intraoperative Monitoring During Carotid Endarterectomy: Does It Improve Outcome? Perspectives in Vascular Surgery and Endovascular Therapy, January 1, 1994; 7(2): 95 - 105. [PDF]