Howdy! I am currently looking to enroll in an Electrophysiology graduate-level course. I have done some prior Undergraduate research in the field. I mostly dealt with algorithms and the computer programming aspects. I am trying, now, to learn the science behind the approach. Does anyone care to give me a minute and explain to me the basis of T-wave alternans, how it is used to predict arrythmias like LQTS? Do Sodium-Potassium channels play a major role in ventricular repolarization or is there another mechanism at work?