Death in children with epilepsy: a population-based study

Background Families of children with newly diagnosed epilepsy worry about death during a seizure. We aimed to assess the frequency and causes of death of children with epilepsy. Method We did a population-based cohort study. The Nova Scotia epilepsy cohort includes all children who developed epilepsy during 1977-85. In 1999, we matched names and birth dates with provincial health-care, death, and marriage registries. We examined death certificates, necropsy reports, and physician records of children who had died and contacted families if sudden unexpected death in epilepsy could have occurred. We measured the effect of sex, age, epilepsy type, and disorder sufficient to cause functional neurological deficit on death rate. We compared cohort mortality with rates in a reference population matched for age and sex. Findings 26 (3.8%) of 692 children with epilepsy died. Frequency of death was 5.3 times higher (95% Cl 2.29-8-32) than in the reference population in the 1980s and 8.8 times higher (4.16-13.43) in the 1990s. Kaplan-Meier curves showed 6.1% mortality 20 years after onset compared with 0.88% in the reference population, Deaths occurred in one (1%) of 97 children with absence epilepsy, 12 (2%) of 510 with partial and primary generalised epilepsy, and 13 (15%) of 85 with secondary generalised epilepsy. 22 deaths were caused by disorders sufficient to cause functional neurological deficit, one by probable sudden unexpected death in epilepsy, two by suicide, and one by homicide. Functional neurological deficit was the only independent determinant of mortality. Interpretation Death from epilepsy is uncommon in children without a severe neurological disorder sufficient to cause functional neurological deficit and sudden unexpected death in epilepsy is rare.