Which situation would indicate synchronized cardioversion?

Which situation would indicate synchronized cardioversion?

• A. Unstable atrial fibrillation
• B. Unstable ventricular tachycardia with no pulse
• C. Asystole
• D. Stable sinus rhythm

Answer: (A)

Synchronized cardioversion is used for unstable tachyarrhythmias with a pulse, because delivering energy in sync with the ECG helps restore a normal rhythm quickly while avoiding delivering energy during the heart’s vulnerable period. In unstable atrial fibrillation, the rapid, irregular rhythm is causing hemodynamic compromise, so a timed shock can promptly convert the rhythm and improve perfusion. The other scenarios don’t fit this approach. Unstable ventricular tachycardia with no pulse is a pulseless rhythm, treated with defibrillation (an unsynchronized shock) and CPR, not synchronized cardioversion. Asystole has no electrical activity and is managed with CPR and medications, not shock. Stable sinus rhythm is already normal, so no cardioversion is indicated.

Synchronized cardioversion is used for unstable tachyarrhythmias with a pulse, because delivering energy in sync with the ECG helps restore a normal rhythm quickly while avoiding delivering energy during the heart’s vulnerable period. In unstable atrial fibrillation, the rapid, irregular rhythm is causing hemodynamic compromise, so a timed shock can promptly convert the rhythm and improve perfusion.

The other scenarios don’t fit this approach. Unstable ventricular tachycardia with no pulse is a pulseless rhythm, treated with defibrillation (an unsynchronized shock) and CPR, not synchronized cardioversion. Asystole has no electrical activity and is managed with CPR and medications, not shock. Stable sinus rhythm is already normal, so no cardioversion is indicated.