P253Can EGM fractionation occur in healthy tissue? Electrophysiological mechanism and significance during atrial tachycardia rhythm. (20th June 2017) - Frontera, A.; Takigawa, M.; Martin, R.; Thompson, N.; Cheniti, G.; Kitamura, T.; Wolf, M.; Vlachos, K.; Massouille, G.; Denis, A.; Hocini, M.; Sacher, F.; et al.