Which medication is used for rate control and symptom relief in heart failure with atrial fibrillation, but must be monitored for toxicity?

Which medication is used for rate control and symptom relief in heart failure with atrial fibrillation, but must be monitored for toxicity?

• A. Digoxin
• B. Amiodarone
• C. Diltiazem
• D. Metoprolol

Answer: (A)

Digoxin is used for rate control and symptom relief in heart failure with atrial fibrillation because it slows the heart rate by increasing vagal tone and AV node refractoriness, which reduces ventricular responses in AFib, while also providing a modest positive inotropic effect that can improve contractility and overall symptoms in heart failure. A key feature is its narrow therapeutic window, which means blood levels must be monitored to avoid toxicity. Therapeutic levels are carefully guided by kidney function, and toxicity can present as gastrointestinal symptoms, confusion or visual changes, and potentially dangerous arrhythmias. This need for regular monitoring distinguishes digoxin from other rate-controlling options and explains why it’s the best choice when toxicity monitoring is emphasized.

Digoxin is used for rate control and symptom relief in heart failure with atrial fibrillation because it slows the heart rate by increasing vagal tone and AV node refractoriness, which reduces ventricular responses in AFib, while also providing a modest positive inotropic effect that can improve contractility and overall symptoms in heart failure. A key feature is its narrow therapeutic window, which means blood levels must be monitored to avoid toxicity. Therapeutic levels are carefully guided by kidney function, and toxicity can present as gastrointestinal symptoms, confusion or visual changes, and potentially dangerous arrhythmias. This need for regular monitoring distinguishes digoxin from other rate-controlling options and explains why it’s the best choice when toxicity monitoring is emphasized.