Enflurane-induced grand mal seizures during otic microsurgery

Area of Science:

• Anesthesiology
• Neuroscience

Background:

• Enflurane anesthesia can induce abnormal electroencephalographic (EEG) seizure-like activity and myoclonic movements.
• This is often associated with respiratory alkalosis and high enflurane concentrations.
• Postoperative generalized tonic-clonic convulsions have also been documented.

Observation:

• Experimental studies suggest auditory stimuli can trigger seizure activity during deep enflurane anesthesia.
• This case presents an intraoperative generalized tonic-clonic convulsion during low enflurane concentrations.
• The convulsion occurred without hyperventilation or auditory stimulation, challenging existing hypotheses.

Findings:

• A patient experienced a generalized tonic-clonic convulsion during low-concentration enflurane anesthesia.
• No hyperventilation or auditory stimuli were present during the event.
• This challenges the established understanding of enflurane-induced seizure activity.

Implications:

• Highlights the potential for rare adverse events with enflurane anesthesia.
• Suggests that factors other than respiratory alkalosis, high concentrations, or auditory stimuli may contribute to enflurane-induced seizures.
• Warrants further investigation into the mechanisms underlying enflurane neurotoxicity and seizure generation.