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Figure 1 An overall change in cycle length in the coronary sinus (CSCL) and pulmonary vein (PVCL). *p < 0.0001, CSCL during vagal excitation versus before ablation, before vagal excitation, and after vagal excitation. p = 0.002, PVCL during vagal excitation versus before ablation. p < 0.0001, PVCL during vagal excitation versus before vagal excitation. p < 0.05, PVCL before vagal excitation versus after vagal excitation, p = 0.0001, PVCL during vagal excitation versus during vagal excitation.