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Figure 3 Left AT. A, Fluoroscopic views of the BC. Small white circles mark the positions of electrode pairs G1–2 and H7–8 located in the high anteroseptal and low posteroseptal regions. Red letters mark splines located anteriorly. B, Simultaneous recordings of the surface ECG, leads I and aVF, and bipolar electrograms from the BC and CS. Electrode pairs G1–2 and H7–8 (arrows) record the earliest activation in the RA. C, Animated maps of the BC recordings. Left panel, First 15 ms of activation in the RA. Right panel, Complete activation of the RA.
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