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Class IV antiarrhythmics
Class IV antiarrhythmics are composed of calcium channelblockers. The calcium channel blockers verapamil and diltiazem are used to treat supraventricular arrhythmias with a rapid ven-tricular response (rapid heart rate in which the rhythm originates above the ventricles).
For a thorough discussion of calcium channel blockers and how they work, see “Calcium channel blockers,”.
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