Role of the Tricuspid Annulus and the Eustachian Valve/Ridge on Atrial Flutter

Abstract

(1) The EVR forms a line of fixed conduction block between the IVC and the CS; (2) the EVR and the TA provide boundaries for the AFL reentrant circuit; and (3) verification of a complete line of block between the TA and the EVR is a more reliable criterion for long-term ablation success.