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Modulation of regularity index (RI) of reentry in atrial fibrillation by intersubject variability in action potential phenotype in response to ion channel block. Interpolated RI maps (dorsal view of the atria) are shown for short and long APD90, APD50, and APD20 subpopulations of models before (default) and after 30% IK1 inhibition, 30% INaK inhibition, and 15% INa inhibition, respectively.
