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Figure 4 (Top) Example of an atrial fibrillation cycle length (AFCL) histogram in electrically remodeled atria before and after four weeks of atrioventricular (AV) block. In dilated atria the median AFCL was longer (shift to the right) and the temporal variation was higher (wider histogram). (Bottom) The absolute and relative irregularity in AFCL in seven goats. In six of seven goats the absolute and relative beat-to-beat variation in AFCL was increased after four weeks of AV block.
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