In atrial flutter, which medication is useful for chronic atrial flutter heart rate management or for maintaining sinus rhythm after cardioversion?

In atrial flutter, which medication is useful for chronic atrial flutter heart rate management or for maintaining sinus rhythm after cardioversion?

• A. IV amiodarone
• B. IV quinidine
• C. IV ibutilide
• D. IV dopamine

Answer: (A)

Managing atrial flutter effectively often requires a medication that can both slow the ventricular response and help keep the heart in sinus rhythm after cardioversion. Amiodarone fits best because it has broad antiarrhythmic effects (primarily class III, with additional sodium and calcium channel and beta-blocking actions) that prolong atrial and ventricular refractoriness and slow AV nodal conduction. This combination reduces the heart rate during flutter and supports maintenance of sinus rhythm after conversion, making it useful for chronic rate control and post-cardioversion rhythm management. Other options have drawbacks: quinidine can slow conduction but carries a higher risk of proarrhythmia and adverse effects, ibutilide is mainly for acute pharmacologic conversion rather than long-term maintenance, and dopamine is not an antiarrhythmic and would not aid rhythm control.

Managing atrial flutter effectively often requires a medication that can both slow the ventricular response and help keep the heart in sinus rhythm after cardioversion. Amiodarone fits best because it has broad antiarrhythmic effects (primarily class III, with additional sodium and calcium channel and beta-blocking actions) that prolong atrial and ventricular refractoriness and slow AV nodal conduction. This combination reduces the heart rate during flutter and supports maintenance of sinus rhythm after conversion, making it useful for chronic rate control and post-cardioversion rhythm management. Other options have drawbacks: quinidine can slow conduction but carries a higher risk of proarrhythmia and adverse effects, ibutilide is mainly for acute pharmacologic conversion rather than long-term maintenance, and dopamine is not an antiarrhythmic and would not aid rhythm control.