A hemodynamically unstable patient with atrial fibrillation and rapid ventricular response, what is the acute management?

• A. Synchronized cardioversion if unstable; if stable, rate control with IV diltiazem or beta-blocker
• B. Immediate anticoagulation only
• C. Beta-blocker only
• D. Synchronized cardioversion if unstable; if stable, rate control with IV diltiazem or beta-blocker

Answer: (D)

When atrial fibrillation with rapid ventricular response causes hemodynamic instability, the immediate priority is to restore stable rhythm and perfusion. Synchronized electrical cardioversion delivers a shock timed to the ECG complex to reset the heart’s rhythm and quickly improve cardiac output, making it the fastest way to reverse shock or poor perfusion in this situation.

If the patient were stable, you would shift to rate control to slow the ventricular response and reduce myocardial oxygen demand, typically with IV diltiazem or a beta-blocker. This helps symptoms and improves filling time, and can sometimes convert to sinus rhythm later, but it doesn’t address the urgent instability.

Anticoagulation is important for long-term stroke prevention, but it does not treat the acute hemodynamic compromise, so it isn’t the primary management in an unstable patient.