Which medication is an AV blocker used for heart rhythm control?

Beta blockers are indeed used as AV blockers to help control heart rhythm. They work by blocking the effects of adrenaline on the beta receptors in the heart. This action slows down the conduction of electrical impulses through the atrioventricular (AV) node, making them particularly effective in managing conditions such as atrial fibrillation or atrial flutter. By reducing the heart rate and modulating the rhythm, beta blockers help to stabilize the heart's electrical conduction system, thereby improving overall heart function and potentially reducing the risk of arrhythmias.

Amiodarone, while also useful for heart rhythm control, primarily works as an antiarrhythmic agent by affecting multiple ion channels and not solely through AV node blockade. Digoxin primarily increases intracellular calcium, which helps improve cardiac contraction but does so without acting directly as a conventional AV blocker. Calcium channel blockers, while they can also slow conduction through the AV node, are not typically categorized as classic AV blockers like beta blockers.