A client with a permanent pacemaker has no pulse or spontaneous respirations and the monitor is displaying a ventricular fibrillation rhythm. Resuscitation is in progress and the nurse is preparing to defibrillate the client with 200 joules of unsynchronized defibrillation. Which intervention is most important for the nurse to implement?

Obtain 12-lead electrocardiogram to evaluate return of pacemaker's sensing, firing, and capture.

Ensure permanent pacemaker interrogated if return of spontaneous circulation is achieved.

Place self-adhesive defibrillator pads at least 1 inch away from permanent pacemaker site.

Apply a doughnut magnet over the pacemaker if pacer-mediated tachycardia develops.