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Figure 4 An example of type 1 atrial fibrillation (AF). This patient had symptomatic paroxysmal AF and had failed multiple drugs. The top panel shows the biatrial map (mesh presentation) in the anterior posterior view. The arrow points to the electrogram recorded from the inferolateral (inf lat) aspect of the right atrium. Note that the cycle length of the complex fractionated atrial electrograms in this area was quite short, only 90 ms. Radiofrequency ablation applications at this site terminated AF (lower panel) and rendered it noninducible. CS = coronary sinus.