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Intracranial pressure during epileptic seizures
Electroencephalography and Clinical Neurophysiology
|June 1, 1984
Summary
This study shows that seizure activity directly increases intracranial pressure (ICP). A mathematical model accurately predicts ICP changes during seizures, highlighting risks in paralyzed patients.
Area of Science:
- Neurology
- Biomedical Engineering
Background:
- Viral encephalitis can cause seizures and elevated intracranial pressure (ICP).
- Therapeutic paralysis is sometimes used to manage ICP during seizures.
Observation:
- Continuous ICP monitoring in a paralyzed patient revealed ICP increases during electrographic seizures.
- Seizures originated in the left frontal lobe, with average duration of 78 seconds.
- Average ICP increase was 6.5 mm Hg, peaking at 16.0 mm Hg.
Findings:
- A mathematical model accurately predicted ICP dynamics, correlating ICP changes with seizure spike frequency and CSF pressure-volume dynamics.
- ICP increase per spike was calculable, suggesting a direct relationship.
- The model predicts prolonged seizures can lead to dangerously high ICP.
Implications:
- ICP elevation during seizures is directly linked to seizure activity frequency.
- Prolonged, unrecognized seizures in paralyzed patients pose a significant risk for dangerously high ICP.
- Mathematical modeling can aid in understanding and predicting ICP fluctuations during seizures.