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Figure 2 Detection of the exit breakthrough points by pulmonary vein (PV) distal pacing. Proximal (bipoles 7–8) electrograms from all splines of the basket catheter placed in the left superior pulmonary vein are shown. Of all PV distal pacing sites, four (B, D, F, and H) are shown. During pacing from B1–2, the earliest activation sites (*) are A7–8 and D7–8. During pacing from D and F1–2, the earliest activation site (*) is D7–8. During pacing from H1–2, the earliest activation site (*) is A7–8. Thus, the exit breakthrough points are A7–8 and D7–8. In contrast, during coronary sinus distal (CS d) pacing, the entrance breakthrough point (*) is A7–8.
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