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Figure 6 (A) The atrial fibrillation cycle length (AFCL) during the first 10 cycles of atrial fibrillation (AF) induced by acetylcholine (ACh) alone and ACh with isoproterenol (Iso). (B) The AFCL in different regions of the right atrium. *p < 0.05 vs. SVC, RPV, and IVC. **p < 0.001 vs. all regions. (C) The standard deviation (SD)-AFCL in different regions of the right atrium. Abbreviations as in Figure 1.