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A, left, mean APD70 for control, chloroquine and washout at 300, 250, and 250 ms CL; right, mean CV for control, chloroquine and washout; 300, 250, and 250 ms CL. B, left: flecainide does not significantly affect the APD70 at any CL; right, flecainide strongly reduces velocity in a reversible manner.
