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Stroke Research and Treatment
Volume 2011 (2011), Article ID 980873, 14 pages
http://dx.doi.org/10.4061/2011/980873
Research Article

Electroencephalography as a Tool for Assessment of Brain Ischemic Alterations after Open Heart Operations

1Bakulev Scientific Center of Cardiovascular Surgery, Russian Academy of Medical Sciences, Leninsky Prospekt 156-368, Moscow 119571, Russia
2Anaesthesiology and Intensive Care Department, Medical Center of the State Bank of Russia, Moscow 117593, Russia

Received 6 September 2010; Revised 31 March 2011; Accepted 31 March 2011

Academic Editor: Halvor Naess

Copyright © 2011 Elena Z. Golukhova et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Cardiac surgery is commonly associated with brain ischemia. Few studies addressed brain electric activity changes after on-pump operations. Eyes closed EEG was performed in 22 patients (mean age: 4 5 . 2 ± 1 1 . 2 ) before and two weeks after valve replacement. Spouses of patients were invited to participate as controls. Generalized increase of beta power most prominent in beta-1 band was an unambiguous pathological sign of postoperative cortex dysfunction, probably, manifesting due to gamma-activity slowing (“beta buzz” symptom). Generalized postoperative increase of delta-1 mean frequency along with increase of slow-wave activity in right posterior region may be hypothesized to be a consequence of intraoperative ischemia as well. At the same time, significant changes of alpha activity were observed in both patient and control groups, and, therefore, may be considered as physiological. Unexpectedly, controls showed prominent increase of electric activity in left temporal region whereas patients were deficient in left hemisphere activity in comparison with controls at postoperative followup. Further research is needed in order to determine the true neurological meaning of the EEG findings after on-pump operations.