QUANTITATIVE EEG-ANALYSIS DURING CARDIAC-SURGERY IN A CASE OF SPONTANEOUS RECALL

A case of spontaneous postoperative recall of intraoperative events du ring tricuspid valvuloplasty is presented. In this case, EEG activity was continuously monitored and quantitatively processed to detect brai n dysfunction during the procedure. Anesthetic maintenance was provide d by fentanyl, isoflurane and midazolam. A retrospective analysis of t he relative power distribution, median frequency and fast/slow ratio w as conducted to characterize the recall and non-recall periods during the surgery. Analysis of the quantitative descriptors suggested that n o specific EEG pattern was associated with the periods of recall. The use of several anesthetics with different effects on the EEG precludes the establishment of a single relationship between descriptors and ch anges in vigilance during episodes of recall.