Which statement best differentiates amiodarone from dronedarone for older adults with atrial fibrillation?

• A. Amiodarone may be reasonable as first-line if there is concurrent heart failure or substantial LVH
• B. Dronedarone is always preferred due to fewer toxicities
• C. Amiodarone has fewer adverse effects than dronedarone
• D. Dronedarone is indicated for permanent AF in all cases

Answer: (A)

In older adults with atrial fibrillation, the presence of structural heart disease, especially heart failure or substantial LV hypertrophy, guides which antiarrhythmic is more appropriate. Amiodarone remains effective and tolerable in patients with heart failure or LV dysfunction, so it can be reasonable to consider it as a first-line option when these conditions are present. Dronedarone, while designed to have fewer toxicities, has proven safety concerns in heart failure and in patients with permanent AF, and it is not universally preferred; it also carries hepatic and drug interaction risks. Therefore, the statement that amiodarone may be reasonable as first-line when concurrent heart failure or LVH exists best differentiates the two drugs in this context.