Class III antiarrhythmics interfere with:

A. magnesium outflow
B. potassium outflow
C. calcium outflow
D. sodium outflow

b
Rationale: Class III antiarrhythmics interfere with potassium outflow. This alters the repolarization phase and prolongs the potential contraction duration of the Purkinje fibers as well as the muscle fibers of the ventricles.

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