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A study of the electroencephalogram during surgery with deep hypothermia and circulatory arrest in infants
Insights
Electroencephalography (EEG) monitoring in infants undergoing open-heart surgery revealed that brain tolerance to deep hypothermia and circulatory arrest is similar to older patients. EEG recovery correlated with arrest duration and temperature.
Area of Science:
- Pediatric Cardiology
- Neurophysiology
- Cardiovascular Surgery
Background:
- Infants undergoing open-heart repair require complex physiological management.
- Deep hypothermia and circulatory arrest are critical components of these procedures.
- Understanding brain tolerance during these interventions is crucial for patient outcomes.
Purpose of the Study:
- To assess the electroencephalography (EEG) patterns in infants during open-heart surgery.
- To correlate EEG recovery with deep hypothermia and circulatory arrest duration.
- To compare infant brain tolerance to deep hypothermia with that of older patients.
Main Methods:
- Continuous six-channel electroencephalography (EEG) monitoring of 17 infants (2.5 to 28 months old).
- Surgical procedures involved surface hypothermia, cold extracorporeal circulation (ECC) to an average esophageal temperature of 21°C, and cardiac arrest (average 40 minutes).
- Post-arrest EEG recovery was analyzed during ECC rewarming.
Main Results:
- EEG reappearance averaged 26 minutes after rewarming initiation, with continuous EEG observed after 44 minutes.
- EEG reappearance latency strongly correlated with the duration of circulatory arrest.
- While 13 infants showed potential EEG normalization, only 2 achieved true normalization within 90-120 minutes post-ECC.
Conclusions:
- Infants demonstrate similar immediate brain tolerance to deep hypothermia and circulatory arrest as older patients.
- EEG monitoring provides valuable insights into cerebral function during pediatric cardiac surgery.
- Further research may explore strategies to improve EEG normalization post-cardiac arrest in infants.
Abstract:
Seveteen infants (2 1/2 to 28 months old) were continuously monitored by six-channel electroencephalography (EEG) during the entire surgical procedure of open-heart repair. They were subjected to surface hypothermia supplemented by cold extracorporeal circulation (ECC) down to an average esophageal temperature of 21 degrees C., to cardiac arrest of 40 minutes average (range 19 to 62 minutes), and to ECC rewarming. Survival time of the EEG was correlated to esophageal temperature at the time of arrest. EEG reappeared an average of 26 minutes (5.30 to 50) after the strat of rewarming ECC and became strictly continuous after 44 minutes. Reappearance latency was well correlated with the duration of arrest. Potential normalization was oberved in 13 infants, but true normalization was observed in only 2 infants during the 90 to 120 minute period after ECC. By judging the EEG and by comparing this series with two previous series of moderate and deeper hypothermia in older patients, we concluded that the immediate tolerance of the brain to deep hypothermia and circulatory arrest seems no different in infants and in older patients.