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Frequency‐dependent effect of selective IKr and IKs block on action potential duration (APD) in dog (Panel A), rabbit (Panel B), and human (panel C) ventricular papillary muscles. Abscissa = pacing cycle length in milliseconds; ordinate = percentile changes in APD90[from Ref. 12 (Panel A), Ref. 49 (Panel B), and Ref. 59 (Panel C), used with permission].
