Sudden unexpected death in epilepsy in children.

Sudden unexpected death in epilepsy (SUPEP) is the commonest cause of seizure-related mortality in people with intractable epilepsy. The incidence of SUDEP varies in different epilepsy populations, with lower rates in population-based studies, higher in referral populations and clinical trials of adjunct drugs for complex partial epilepsy, and highest rates for surgical series. Certain risk factors for SUDEP have been identified, with seizure activity being one of the strongest risk factor for SUDEP. Suspected underlying mechanisms include cardiac dysrhythmias, seizure-related apnoea and postictal respiratory arrest. Prevention of SUDEP has centred on seizure control, and SUDEP incidence has been reduced by epilepsy surgery in some studies. In this review, we present epidemiological data, and discuss risk factors and underlying pathophysiological mechanisms that are associated with SUDEP in children.