Electroencephalogram-Based Prognosis of Cardiac Surgery — A Long-Term Follow-Up Study
Hansotia et al.  reported on the use of electroencephalogram (EEG) in determining the immediate outcome of cardiac surgery. During a two year period between 1970 and 1972, 117 patients undergoing cardiac operations were studied. EEGs were recorded pre-operatively, in the recovery room (up to 12 hr. post-operatively), 24 hr., 2 days, 7 days, and at regular weekly intervals if abnormal. Operative and anesthesia data were correlated with EEG findings. All patients had normal EEGs pre-operatively. On the basis of EEG criteria, four groups were identified: Group I — The EEG remained normal throughout the postoperative period (41 patients); Group II — Diffuse, nonspecific EEG abnormalities in the recovery room, followed by a normal EEG thereafter (25 patients); Group III — Abnormal EEG in the recovery room with essentially no change throughout the remainder of the hospital stay (40 patients); and Group IV — Abnormal EEG in the recovery room with a progressively worsening pattern until the patient died (11 patients).
KeywordsRecovery Room Cardiac Surgery Patient Coronary Arteriography Normal EEGs Coronary Artery Surgery Study
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