Correlation between seizure in children and prolonged QT interval

Background: long qt is a cardiac electrical disorder. one of the symptoms of long qt causedby fatal ventricular arrhythmia is seizure. in some studies it was indicated that up to 35% ofseizures induced by long qt may be misdiagnosed as other causes of seizure.methods: in a case-control study, patients experiencing primary seizure with unknownetiology and referring for clinical diagnosis were selected as the case group. the control groupconsisted of patients hospitalized for other reasons except seizure. corrected qt interval (qtc)was measured for each patient on an electrocardiogram, and the two groups were compared.long qt was defined as a qt more than 0.46 seconds.results: among 508 subjects who were recruited in this study 254 children were in the casegroup and 254 were in the control group. there were 66 children experiencing seizure and longqt in the case group. in the control group, 48 children with long qt were observed; thedifference was statistically significant (p = 0.02). syncope and sudden death were notsignificantly different between the two groups.conclusion: the present study showed that children with unknown causes of seizure havemore frequently long qtc, which implies the possibility of an arrhythmic origin of someseizures. therefore, it is advised to get an electrocardiography for patients with unknown causesof seizure.