Arquivos de Neuro-Psiquiatria (Sep 1990)

Photoparoxysmal responses

  • Mauro Muszkat,
  • Rosana M. Guimarães,
  • Ademir B. da Silva,
  • Carlos J. Reis de Campos

DOI
https://doi.org/10.1590/S0004-282X1990000300006
Journal volume & issue
Vol. 48, no. 3
pp. 301 – 305

Abstract

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Sixty-five outpatients with photoparoxysmal response (PPR) during routine EEG were studied. The PPR showed prevalence in women (75.4%). Seizures were found in 66.1% of cases. The rest recordings were abnormal in 41.8% with prevalence of generalized paroxysm. Eight patterns of PPR were observed, being polyspike mixed to slow wave the most frequent (53%). The epileptic group showed a bimodal distribution in the several bands of photic stimulation, near 8 and 20-24 Hz. A sustained paroxysmal abnormality persisting after the photic stimulation was present in 6 epileptic patients.