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Stimulus-induced, sleep-bound, focal seizures: a case report
Francesca Siclari1, Lino Nobili, Giorgio Lo Russo
1Department of Neurology, University Hospital Zürich, Switzerland.
Sleep
|December 2, 2011
Summary
The arousal system is crucial in nocturnal frontal lobe epilepsy (NFLE), even in non-familial cases. Alerting stimuli can trigger seizures and show brain hyperperfusion in NFLE patients.
Area of Science:
- Neurology
- Epileptology
- Sleep Medicine
Background:
- Nocturnal frontal lobe epilepsy (NFLE) seizures predominantly occur during non-rapid eye movement (NREM) sleep.
- The exact mechanisms binding NFLE seizures to sleep remain unclear.
- Previous research suggested a role for the arousal system in familial, nonlesional NFLE.
Observation:
- A case of pharmacoresistant, likely cryptogenic, non-familial NFLE is presented.
- Seizures in this patient were strictly sleep-bound and could be provoked by alerting stimuli.
- Single-photon emission computed tomography (SPECT) imaging revealed ictal bilateral thalamic and right orbital-insular hyperperfusion.
Findings:
- The arousal system is implicated in the pathogenesis of cryptogenic, non-familial NFLE.
- Alerting stimuli can precipitate seizures in this NFLE subtype.
- Ictal SPECT demonstrated hyperperfusion in specific brain regions, including the thalamus and orbital-insular cortex.
Implications:
- This case expands the understanding of NFLE pathophysiology beyond familial forms.
- It highlights the potential involvement of the arousal system in diverse NFLE presentations.
- Findings may inform future diagnostic and therapeutic strategies for sleep-related epilepsies.
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