The EEGs from 28 children less than 2 years of age who underwent cardiac surgery utilizing deep hypothermia and circulatory arrest are reported. There was no increase in the number of abnormal EEGs following this procedure when both pre- and postoperative records were available. The subgroup requiring surgery on an emergency basis had only postoperative records and accounted for a disproportionate number of the abnormal postoperative EEGs. Recordings were made on 14 patients during surgery. In no case was electrical activity lost on the basis of temperature alone. EEG voltage decreased significantly with little change in frequency as the patient's temperature fell. In spite of sustained total circulatory arrest, low voltage activity persisted in the occipital area throughout the procedure (11-46 min) in 8 children while all cerebral activity was lost for 6-32 min in the other 6. Intraoperative paroxysmal activity was observed in 7 children but neither this nor temporary loss of activity during circulatory arrest appeared related to the subsequent clinical course. Recovery of the EEG activity was prompt. When temperatures returned to 35°C, frequencies and voltages were similar to those of the early anesthesia period.
|Original language||English (US)|
|Number of pages||7|
|Journal||Electroencephalography and Clinical Neurophysiology|
|State||Published - 1974|
ASJC Scopus subject areas
- Clinical Neurology