Photosensitive epilepsies and pathophysiologic mechanisms of the photoparoxysmal response.
OBJECTIVE: To identify the pathophysiologic mechanisms of the photoparoxysmal response ( PPR) in various photosensitive epilepsy syndromes, and to discuss the relation between these pathophysiologic mechanisms and the classification of epilepsies and epileptic syndromes. BACKGROUND: The authors found two types of pathophysiologic mechanisms of PPRs (wavelength-dependent PPRs and quantity-of-light-dependent PPRs) in patients with idiopathic generalized epilepsy and hereditary dentatorubral-pallidoluysian atrophy. METHODS: Intermittent photic stimulation with wavelength-specific optical filters was performed in photosensitive epileptic patients: six patients had severe myoclonic epilepsy in infancy (SMEI), eight had localization-related epilepsy (LRE), and seven had symptomatic generalized epilepsy (SGE). RESULTS: Four of the six photosensitive SMEI patients had quantity-of-light-dependent PPRs. Five of the eight photosensitive LRE patients had wavelength-dependent PPRs. Four of the seven photosensitive SGE patients had wavelength-dependent PPRs, and two had quantity-of-light-dependent PPRs. CONCLUSIONS: The type of pathophysiologic mechanism for eliciting PPRs by low-luminance photic stimulation was closely related to the classification of the epilepsy syndrome.[1]References
- Photosensitive epilepsies and pathophysiologic mechanisms of the photoparoxysmal response. Takahashi, Y., Fujiwara, T., Yagi, K., Seino, M. Neurology (1999) [Pubmed]
Annotations and hyperlinks in this abstract are from individual authors of WikiGenes or automatically generated by the WikiGenes Data Mining Engine. The abstract is from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.About WikiGenesOpen Access LicencePrivacy PolicyTerms of Useapsburg
