Calcium Channel Blockers are effective in treating which type of arrhythmias?

Calcium channel blockers are primarily effective in treating atrial fibrillation and supraventricular tachycardia (SVT) because these medications help to slow down the conduction through the AV node and decrease the heart rate. In cases of atrial fibrillation, calcium channel blockers promote better rate control, allowing the heart to beat more effectively and helping to manage the irregular rhythm. For SVT, these medications can interrupt the reentrant pathways, providing effective rate control and stabilizing the rhythm.

While it’s important to understand the therapeutic applications of these medications, options like ventricular fibrillation, atrial flutter alone, and heart block are not treated with calcium channel blockers in the same way. Ventricular fibrillation is a life-threatening condition that requires immediate defibrillation and not management with calcium channel blockers. Atrial flutter may sometimes require different therapeutic approaches such as anticoagulation or cardioversion. Regarding heart block, treatment typically focuses on pacing rather than the use of calcium channel blockers, as these could potentially worsen the condition. Thus, the use of calcium channel blockers is specifically indicated for managing atrial fibrillation and SVT, making that the correct choice.