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BJA Advance Access originally published online on February 18, 2005
British Journal of Anaesthesia 2005 94(5):626-629; doi:10.1093/bja/aei096
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© The Board of Management and Trustees of the British Journal of Anaesthesia 2005. All rights reserved. For Permissions, please e-mail: journal.permissions{at}oupjournals.org

CASE REPORT

Recovery of N100 component of auditory event-related potentials and EEG after cardiac arrest during propofol sedation

S. M. Westerén-Punnonen1,*, H. Yppärilä1,3, T. Musialowicz2, I. Korhonen3, M. Hynynen4 and J. Partanen1

1 Department of Clinical Neurophysiology and 2 Department of Anaesthesiology and Intensive Care, Kuopio University Hospital, Finland. 3 VTT Information Technology, Tampere, Finland. 4 Departments of Anaesthesiology and Intensive Care Medicine, Helsinki University Hospital, Jorvi Hospital, Espoo, Finland

* Corresponding author. E-mail: susanna.westeren-punnonen{at}kuh.fi

We report on the EEG monitoring of a patient who suffered an episode of postoperative ventricular fibrillation (VF) following coronary artery bypass grafting (CABG). VF initially caused a considerable suppression and slowing of the EEG. The recovery of cerebral function was evaluated by recording both EEG and auditory event related potentials (ERPs). Six hours after the episode of VF, when the patient was asleep but arousable to voice command, the N100 component of the auditory ERPs had recovered to the level measured before the operation, whereas the EEG was still very slow for that level of sedation. This may have been due to VF having less effect on the N100 component than on the background EEG. Our findings suggest that measuring evoked potentials may improve the evaluation of brain function after cardiac arrest.


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