What potential issue can all antidysrhythmic medications cause?

Antidysrhythmic medications are used to treat abnormal heart rhythms, but they can also have the unintended consequence of exacerbating existing rhythm disorders. This phenomenon occurs because these medications can alter the electrophysiological properties of cardiac cells, leading to new arrhythmias or making pre-existing conditions worse. For instance, while an antidysrhythmic may be intended to restore normal rhythm, it may inadvertently cause prolonged QT intervals, which can lead to dangerous ventricular arrhythmias like torsades de pointes. Therefore, careful monitoring and consideration of a patient’s specific cardiac conditions are vital when prescribing these medications to minimize any potential adverse effects on their heart rhythm.

The other options mischaracterize the function and effects of antidysrhythmic drugs, as they do indeed treat rhythm disorders, can influence heart rate, and, like any medication, involve a risk of side effects.