EEG-changes during general anaesthesia with enflurane (Efrane) in comparison with ether

Area of Science:

• Anesthesiology
• Neuroscience
• Cerebral Function Monitoring

Background:

• Understanding the neurophysiological effects of anesthetic agents is crucial for patient safety.
• Enflurane and ether are commonly used volatile anesthetics with distinct cerebral profiles.

Purpose of the Study:

• To investigate and compare the impact of enflurane and ether on cerebral functions via electroencephalography (EEG).
• To assess EEG changes indicative of cerebral excitability at varying depths of anesthesia.

Main Methods:

• Adult patients were divided into two similar groups for anesthesia with either enflurane or ether.
• Electroencephalography (EEG) was employed to monitor cerebral activity.
• Anesthesia depth was adjusted to permit abdominal surgery without muscle relaxants, and further increased to observe changes.

Main Results:

• At a basic anesthesia depth, typical paroxysmal EEG changes associated with enflurane were infrequent.
• Increasing anesthesia depth led to more frequent EEG changes indicating heightened cerebral excitability with enflurane.
• Similar EEG changes suggesting increased cerebral excitability were also observed with ether at deeper anesthesia levels.
• No seizure activity was recorded during the study under either anesthetic agent.

Conclusions:

• Cerebral excitability, as indicated by specific EEG changes, increases with deeper anesthesia levels for both enflurane and ether.
• Enflurane may show these changes more readily than ether at comparable depths, though both agents can induce them.
• The study did not find evidence of seizure activity, suggesting a degree of safety at the tested depths.