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Correlation between EEG and heart rate variation in deep enflurane anaesthesia
A Yli-Hankala1, H Heikkilä, A Värri
1Department of Anaesthesia, Tampere University Central Hospital, Finland.
Acta Anaesthesiologica Scandinavica
|February 1, 1990
Summary
Heart rate changes during enflurane anesthesia correlate with EEG patterns in women. Bursts and suppressions in brain activity align with heart rate acceleration and deceleration, respectively.
Area of Science:
- Anesthesiology
- Neurophysiology
- Cardiology
Background:
- Enflurane is an inhaled anesthetic agent.
- Understanding anesthetic effects on autonomic function is crucial.
- Electroencephalogram (EEG) patterns reflect cortical activity during anesthesia.
Purpose of the Study:
- To investigate the relationship between heart rate variations and EEG patterns during deep enflurane anesthesia.
- To explore potential underlying mechanisms controlling both cortical and autonomic responses.
Main Methods:
- Studied 11 women undergoing elective surgery under deep enflurane anesthesia.
- Monitored heart rate and EEG patterns.
- Analyzed correlations between EEG bursts/suppressions and heart rate fluctuations.
- Ruled out respiratory arrhythmia as an explanation.
Main Results:
- A significant correlation was observed between heart rate variations and EEG patterns.
- EEG bursts coincided with heart rate acceleration in all patients.
- EEG suppressions were associated with heart rate deceleration in all patients.
Conclusions:
- Cortical electrical activity and heart rate fluctuations during enflurane anesthesia are linked.
- A common subcortical factor likely regulates both EEG patterns and heart rate variability.
- These findings enhance understanding of anesthetic effects on the central and autonomic nervous systems.