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Figure 4 Tricuspid annulus recording sites. The distribution of recording sites located around the tricuspid valve are shown schematically. Each recording site was targeted in the left anterior oblique fluoroscopic projection. Recording sites were categorized by the analogous hour position on a clock face. All navigation attempts to sites around the tricuspid annulus were successful. An example of a recording site at the lateral (Lat) aspect (9:00) on the tricuspid valve annulus (TVA) is shown in right anterior oblique (left) and left anterior oblique (right) images. The septal (Sep), anterior (Ant), and posterior (Post) tricuspid annulus are indicated for orientation.