 The impact of antiepileptic drugs on the EEG can vary from marked to none. A small number of AEDs also affect the EKG. Lacosamide is a new AED that selectively enhances slow inactivation of voltage-gated sodium channels, resulting in stabilization of hyperexcitable neuronal membranes and inhibition of repetitive neuronal firing. Information is lacking about the effect of lacosamide on brain and heart rhythms. 