Methods and apparatus for determining T-wave alternan signatures (i.e., morphology and polarity) derived from a physiologic signal representative of a subject's heart activity; assessing changes in the myocardium Action Potential (“AP”) through analysis of the alternan signature derived from a physiologic...http://www.google.de/patents/US7174204?utm_source=gb-gplus-sharePatent US7174204 - Methods for quantifying the morphology and amplitude of cardiac action potential alternans
