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Aims  A few studies suggested that epilepsy and antiepileptic drugs with sodium channel‐blocking properties were independently associated with out‐of‐hospital cardiac arrest (OHCA). However, these findings have not yet been replicated.    Methods  Using Danish registries, we conducted a nested case–control study in a cohort of individuals between 1 June 2001 and 31 December 2015. Cases were defined as OHCA from presumed cardiac causes, and were matched with non‐OHCA‐controls based on sex, and age on the date of OHCA. Exposure of interest was epilepsy or antiepileptic drug use. To study the association between individual antiepileptic drug use and the rate of OHCA, we compared each antiepileptic drug with valproic acid. Cox regression with time‐dependent covariates was conducted to calculate hazard ratio (HR) and 95% confidence interval (CI).    Results  We identified 35 195 OHCA‐cases and 351 950 matched non‐OHCA controls. Epilepsy (cases: 3.58%, controls: 1.60%) was associated with increased rate of OHCA compared with the general population (HR: 1.76, 95%CI: 1.64–1.88) when common OHCA risk factors were taken into account. When we studied antiepileptic drug use, we found that 2 antiepileptic drugs without sodium channel blockage, clonazepam (HR: 1.88, 95%CI: 1.45–2.44) and pregabalin (HR: 1.33, 95%CI: 1.05–1.69), were associated with OHCA, whereas none of the antiepileptic drugs with sodium channel blockage were associated with OHCA.    Conclusion  Epilepsy is associated with increased rate of OHCA. Our findings do not support a possible association between antiepileptic drugs with sodium channel‐blocking properties and OHCA.

Risk of out‐of‐hospital cardiac arrest in patients with epilepsy and users of antiepileptic drugs