The purpose of this study is to evaluate the effect of different intravenous doses (IV) of a
new anti-epileptic drug (AED) called lacosamide on continuous EEG (electroencephalogram)
rhythms (or brain rhythms) in subjects with focal seizures and the tolerability of those
doses by patients. In addition, this study will assess the effect of IV lacosamide on EKG
(electrocardiogram), a test which checks for problems with the electrical activity of the
heart.