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[Photosensitivity in children with idiopathic headaches]

Janusz Wendorff1, Barbara Juchniewicz

  • 1Klinika Neurologii, Instytut Centrum Zdrowia Matki Polki w Lodzi. JanuszWendorff@poczta.fm

Neurologia I Neurochirurgia Polska
|January 20, 2006
PubMed

Insights

Photosensitivity, detected as a photoparoxysmal response (PPR) on EEG, is common in children with headaches. This study found PPR frequently co-occurred with light-triggered migraines, suggesting general brain hyperexcitability in migraine patients.

Area of Science:

  • Neurology
  • Pediatrics
  • Clinical Neurophysiology

Background:

  • Photosensitivity, characterized by a photoparoxysmal response (PPR) on EEG, is a genetically determined trait.
  • PPR occurs in 1.3-1.4% of healthy children and adolescents (aged 6-18).
  • The relationship between photosensitivity, migraine, and epilepsy remains incompletely understood, particularly in pediatric idiopathic headaches.

Purpose of the Study:

  • To compare the frequency and types of PPR in children with migraine with aura, migraine without aura, and tension-type headaches.
  • To investigate the correlation between PPR and photogenic triggering factors in pediatric migraine patients.
  • To explore the implications of PPR in the context of general cortical hyperexcitability in migraine.

Main Methods:

  • Electroencephalogram (EEG) records were analyzed for 263 children (aged 7-18) diagnosed with idiopathic headaches.
  • Patients were categorized into migraine with aura (77), migraine without aura (112), and tension-type headache (74) groups.
  • Fisher exact test was used to compare PPR frequency and photogenic triggering factors between groups.

Main Results:

  • The overall frequency of PPR did not significantly differ across the three headache types (migraine with aura: 7.8%, migraine without aura: 8.9%, tension-type headache: 6.7%).
  • PPR was most prevalent in children under 12 with migraine with aura (17.6%).
  • In migraine patients with PPR, photogenic stimuli were significantly more frequent triggers (7/17) compared to those without PPR (10/100, p<0.01).

Conclusions:

  • The study suggests a frequent coexistence of PPR and photogenic migraine triggers in children and adolescents.
  • Findings support the hypothesis of generalized cortical hyperexcitability in migraine.
  • PPR may serve as a relevant biomarker for photosensitivity in pediatric headache disorders.

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