Accurate mapping of electrophysiologic activation within the human heart is achieved for discrete areas within the myocardium by utilizing a catheter having at least one pair of orthogonal sensors disposed on the catheter. Orthogonal sensors, which are comprised of two or more electrodes generally disposed...http://www.google.com/patents/US5450846?utm_source=gb-gplus-sharePatent US5450846 - Method for spatially specific electrophysiological sensing for mapping, pacing and ablating human myocardium and a catheter for the same
