New insights into how antiarrhythmic drugs work

If you suffer from atrial fibrillation (AF)—a condition where disorganized electrical signals cause the heart’s upper chambers to contract quickly and irregularly—your doctor may prescribe an antiarrhythmic drug. While these drugs have long been prescribed for AF, which has been linked to an increased risk of stroke, chest pains and even heart failure, their complete mechanisms for restoring action and mitigating these risks have been unclear.

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