Click on image to view larger version.

Figure 1 Left anterior oblique view demonstrating catheter positioning during isthmus-dependent atrial flutter ablation. A Halo catheter is placed on the tricuspid annulus, and a quadripolar catheter in the right ventricle. A steerable quadripolar catheter is used for mapping and ablation along the tricuspid annulus/inferior vena cava isthmus. Abl = ablation catheter; Halo 1–2 = distal; Halo 19–20 = proximal; Quad = quadripolar catheter.