 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. 