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Figure 1 Electrophysiologic measurements. Proximal (bipoles 7–8) electrograms from all splines of the basket catheter placed in the left superior pulmonary vein are shown. The drive cycle conduction time (S1–A1) and the conduction time of the shortest coupled extrastimulus propagated to the site (S2–A2) are measured, and the minimum and maximum values among all the splines are determined. Letters A to H identify basket splines.
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