PREVALENCE OF PHOTOPAROXYSMAL RESPONSE AMONG SOUTH INDIAN EPILEPSY PATIENTS

The reported geographical variations in the prevalence of photoparoxys mal response (PPR) among epilepsy patients have been variously attribu ted to methodological problems such as patient selection, technique of intermittent photic stimulation (IPS) and definition of PPR, and envi ronmental and racial factors. We determined the prevalence rate of PPR among South Indian epilepsy patients and compared it with the rates r eported from elsewhere. Twenty of our 575 patients had a PPR, a preval ence ratio of 3.5%, which is in striking contrast to the 0.6% reported for North Indian epilepsy patients. Environmental and racial factors cannot explain the difference in the prevalence rates of PPR between S outh and North Indian epilepsy patients. We conclude that the demograp hic characteristics of the patient group, such as age and gender, the epilepsy type, sleep deprivation, technique of IPS and definition of P PR, greatly influence the prevalence rate of PPR.