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Figure 2 Site of Origin of the Same Adenosine-Sensitive AT From Figure 1, Localized to the Anteroseptal LA Near the Mitral Annulus

(A) Shown are same surface and intracardiac electrograms as in Figure 1, and recordings from the mapping catheter at the site of successful ablation. The electrogram at site of successful ablation is relatively narrow (58 ms) and high amplitude (0.86 mV). (B) An isochronal electroanatomic map of the left atrium (LA) in the left anterior oblique projection demonstrates a focal site of early activation in the region of the anteroseptal mitral annulus with centrifugal propagation in the LA. LAT = lateral; MV = mitral valve; p = proximal; other abbreviations as in Figure 1.