Preoperative and postoperative neurological evaluation of 22 infants (4 days to 24 mth old, 2.7 to 9.7 kg) having correction of congenital cardiac anomalies by deep hypothermia 14° to 23° C) and circulatory arrest (10 to 57 min) revealed only 6 normal clinical neurological examinations prior to surgery. 16 patients had neurological defects, delayed psychomotor development, or muscular hypotonia. Seizures occurred in 2 and choreo athetosis in 4 of 22 survivors 4 to 6 days after surgery and varied in severity and duration. Abnormal electroencephalograms (eeg) 1 wk after surgery in 6 patients did not necessarily correlate with clinical defects. Continuous EEG during 14 operations showed decreased voltage and frequency with hypothermia, but cerebral activity was not lost prior to circulatory arrest. Low voltage (1 to 4 μv) activity persisted in 8 patients through the arrest period. Examination 2 to 15 mth postoperatively showed that only 1 of 18 patients had significant persistent dyskinesias, and the EEG was normal in all except 3. Developmental delay and/or hypotonia persisted in one half the patients, but the degree was often less marked. Cerebral metabolism is altered by deep hypothermia and circulatory arrest, and neurological defects may follow. Fortunately, significant persistent neurological damage is unusual (1/22 = 4%).
|Original language||English (US)|
|Title of host publication||AMER.HEART ASS.MONOGR.|
|State||Published - 1974|
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