A nurse is preparing an in-service presentation about the use of automated external defibrillators (AEDs). Which of the following instructions should the nurse include in the teaching?

Rationale: A. "Use an AED for a client who has atrial fibrillation.": Atrial fibrillation is an organized but irregular rhythm that generally does not cause cardiac arrest. AEDs are indicated for shockable rhythms such as ventricular fibrillation and pulseless ventricular tachycardia. Using an AED on a client with atrial fibrillation is unnecessary and ineffective. B. "Set the AED to 80 joules.": Modern AEDs are automated and preprogrammed to deliver the appropriate energy for defibrillation. Users should follow the device prompts rather than manually setting the joules, as incorrect energy selection can be ineffective or harmful. C. "Perform CPR while the AED is analyzing.": The AED must analyze the heart rhythm without interference. Performing CPR during this analysis can prevent accurate detection of a shockable rhythm and compromise the effectiveness of defibrillation. CPR should be paused momentarily while the AED evaluates the rhythm. D. "Position the client on a flat surface.": Proper positioning on a firm, flat surface ensures effective chest compressions during CPR and optimal contact for AED pads. A flat surface allows for maximal transmission of electrical current through the heart during defibrillation, improving the likelihood of successful rhythm conversion.