Atrial decremental evoked potentials accurately determine the critical isthmus of intra-atrial re-entrant tachycardia. Issue 10 (31st July 2018) - Bhaskaran, A; Gizurarson, S; Porta-Sánchez, Andreu; Massé, Stéphane; Nair, Krishnakumar; Nanthakumar, Kumaraswamy