J.Jpn. Surg. Soc.. 89(7): 1083-1092, 1988

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Original article

EARLY DETECTION OF CENTRAL NERVOUS SYSTEM DYSFUNCTION DURING CARDIOPULMONARY BYPASS USING EEG MONITORING

The EEG was monitored in fifty-four patients during and after various surgeries requiring cardiopulmonary bypass (CPB) to assist in the early detection of central nervous system dysfunction (CNSD). Bilateral frontopolar EEG signals were processed with a 2-channel, real-time Fast-Fourier-Transformer (FFT) analyser and Compressed Spectral Arrays (CSA) were obtained.
The fifty-four patients were divided into 3 groups based upon clinical outcome; Group 1 : patients without CNSD (83%); Group 2: patients with delayed recovery from anesthesia but without CNSD (4%); and Group 3: patients with apparent postoperative CNSD (13%).
There was no difference in the CSA among these groups prior to rewarming, but after the rewarming phase, two distinct sets emerged. Groups 1 and 2 showed a shift of the CSA predominant peak from a low frequency to a higher frequency. On the other hand, Group 3 patients demonstrated either stable predominant peaks in the lower frequencies or gradual flattening of the CSA.
We conclude that the intra-operative EEG monitoring is a useful tool for the early detection of CNSD during and after CPB.

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