A nurse on the cardiac care unit is caring for a client who is hemodynamically unstable. For which of the following dysrhythmias should the nurse plan for synchronized cardioversion?

Choice A reason: Premature atrial complexes are usually benign and do not require cardioversion. They are often managed with observation or medication if symptomatic. Choice B reason: Ventricular fibrillation requires immediate defibrillation, not synchronized cardioversion, because there is no organized rhythm to synchronize with. Choice C reason: Atrial fibrillation in a hemodynamically unstable client is correct. Synchronized cardioversion delivers a shock timed with the R wave to restore sinus rhythm and prevent deterioration. Choice D reason: Ventricular asystole is a flatline rhythm and requires CPR and epinephrine, not cardioversion. Shocking asystole is ineffective.