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Photosensitivity in generalized epilepsies.

Shervonne Poleon1, Jerzy P Szaflarski1

  • 1University of Alabama at Birmingham, Department of Neurology and UAB Epilepsy Center, Birmingham, AL, USA.

Epilepsy & Behavior : E&B
|February 21, 2017
PubMed
Summary
This summary is machine-generated.

Photosensitive epilepsy (PSE) involves abnormal EEG responses to visual stimuli, known as a photoparoxysmal response (PPR). Understanding PPR pathophysiology and treatment is crucial for managing this condition in epilepsy patients.

Keywords:
IGEJMEPhotoparoxysmal responsePhotosensitivityTreatment

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Area of Science:

  • Neurology
  • Epileptology
  • Neurophysiology

Background:

  • Photosensitivity, a key feature of photosensitive epilepsy (PSE), is characterized by an abnormal electroencephalogram (EEG) response to visual stimuli, termed photoparoxysmal response (PPR).
  • PPR occurs in 2-14% of epilepsy patients, yet its underlying pathophysiology remains incompletely understood.
  • PPR manifests electrographically as 2-5Hz spike, spike-wave, or slow wave complexes, often with frontal and paracentral prevalence.

Purpose of the Study:

  • To review the current understanding of photosensitive epilepsy (PSE) and the photoparoxysmal response (PPR).
  • To highlight diagnostic methods and triggers for PPR.
  • To summarize reported abnormalities and treatment strategies for photosensitivity.

Main Methods:

  • Diagnosis confirmed via intermittent photic stimulation (IPS) and video monitoring.
  • Identification of visual stimuli that can elicit PPR, such as flicker, high contrast gratings, and modulating luminance patterns.
  • Review of studies examining structural and functional connectivity, cortical excitability, morphology, and neuropsychological function in patients with photosensitivity.

Main Results:

  • PPR can be triggered by common visual stimuli from electronic devices and entertainment venues.
  • Photosensitivity is associated with various epilepsy syndromes, including idiopathic (e.g., juvenile myoclonic epilepsy) and non-idiopathic forms.
  • Abnormalities in connectivity, cortical excitability, morphology, and neuropsychological function are frequently reported across different syndromes.

Conclusions:

  • Photosensitive epilepsy (PSE) and its hallmark, the photoparoxysmal response (PPR), present significant diagnostic and management challenges.
  • Effective management involves antiepileptic drugs, non-pharmacological interventions like tinted glasses, and occupational adjustments to avoid triggering stimuli.
  • Further research into PPR pathophysiology is essential for developing more targeted and effective treatments for photosensitive epilepsy.