Activation and Entrainment Mapping Defines the Tricuspid Annulus as the Anterior Barrier in Typical Atrial Flutter

Abstract

Closely spaced sites around the tricuspid annulus are activated sequentially, and are all within the flutter circuit according to entrainment criteria. This demonstrates that the tricuspid annulus constitutes a continuous anterior barrier constraining the reentrant wave front of human counterclockwise atrial flutter.