Which of the following statements is true of antiarrhythmic drugs?
A. Most antiarrhythmic drugs exert their major antiarrhythmic action on a specific phase of the action potential.
B. Antiarrhythmic drugs that reduce the durations of Phases 1-3 of the cardiac action potential produce effective antiarrhythmic actions.
C. Very few antiarrhythmic drugs have the potential to make any existing arrhythmia worse.
D. Antiarrhythmic drugs that decrease the duration of Phase 0 of the cardiac action potential are the most effective therapeutically.
Answer: A
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