Figure 4. Regular AT development during repeat ablation
During repeat ablation, a total of 31 spontaneous or pacing-induced ATs were mapped by a 3-dimentional mapping system. Prevalence of AT (left) and details of AT circuits (right) are shown. AT was more often observed in patients with LVA (Group B or C) than those without (group A). Patients who underwent LVA ablation (group B) had more frequent AT development than those did not (group C). All 6 biatrial tachycardias developed in patients with LVA ablation (group B). AT indicates atrial tachycardia.