P907Atrial septum dissection following transseptal puncture for left atrial ablation: an underestimated complication. (19th March 2018) - Sakellaropoulou, A; Asvestas, D; Bazoukis, G; Saplaouras, A; Giannakakis, G; Letsas, K; Efremidis, M; Sideris, A