Which condition is NOT typically treated with Class III antidysrhythmics?

Class III antidysrhythmics are primarily used to manage certain types of tachyarrhythmias due to their ability to prolong the action potential and refractory period in cardiac tissues. Common conditions treated with these medications include ventricular tachycardia and atrial fibrillation, where controlling the heart rate and rhythm is crucial.

In the case of bradycardia, the primary concern is a slow heart rate rather than a rapid or irregular rhythm. Class III agents do not effectively address bradycardia; in fact, they may exacerbate the condition since they work to slow down electrical conduction further. Instead, bradycardia is generally managed with pacing or medications that can increase the heart rate, such as atropine.

Thus, among the options provided, bradycardia stands out as the condition not typically treated with Class III antidysrhythmics due to the fundamentally different nature of the treatment goals for this condition compared to tachyarrhythmias.