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Figure 3 (Top) Bipolar electrograms from the right atrial wall after 0, 24, and 48 h of atrial fibrillation (AF) in dilated and nondilated atria. The numbers indicate the median AF cycle length (AFCL). (Bottom) Effects of electrical remodeling on AFCL during the first 48 h of AF (n = 7). *p < 0.05.