Prognosis of photoparoxysmal response in nonepileptic patients

Elson L. So, Kevin H. Ruggles, Peter A. Ahmann, Kurt A. Olson

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


Photoparoxysmal response (PPR) is sometimes incidentally encountered in EEGs performed for evaluation of nonepileptic symptoms. We conducted the first long-term study of a cohort of nonepileptic patients to determine their risk of having seizures subsequent to incidental recording of PPR. After 6 to 12 years (mean, 9 years), none of the 33 patients had had epileptic seizures. To identify prognostic factors associated with PPR, we performed a case-control study comparing the cohort with 33 age-matched patients who had had epileptic seizures prior to PPR recording. There was no statistically significant difference between the two groups with respect to the clinical or EEG data. Morphology of the PPR discharge was not different between the two groups. Contrary to what is widely believed, persistence of PPR discharges beyond stimulation was not associated with a high risk of developing seizures. Prognosis of PPR is age-dependent and seems favorable in adults without previous epileptic seizures.

Original languageEnglish (US)
Pages (from-to)1719-1722
Number of pages4
Issue number9
StatePublished - Sep 1993

ASJC Scopus subject areas

  • Clinical Neurology


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