An Automated External Defibrillator (AED) is a portable electronic device that automatically diagnoses life-threatening cardiac arrhythmias, specifically ventricular fibrillation and pulseless ventricular tachycardia. When the heart enters these chaotic rhythms, it cannot pump blood effectively. The AED delivers a calculated electric shock to reset the heart's electrical system, allowing a normal sinus rhythm to resume. Time is critical during sudden cardiac arrest; every minute without defibrillation reduces survival rates significantly. In Nigerian clinical and community settings, the availability of public-access AEDs is growing, making it vital for nurses to understand their function and teach basic operators how to use them effectively.
During basic life support, an AED is indicated when a patient presents with three specific clinical criteria: unconsciousness, absence of normal breathing, and lack of a palpable pulse.
Never apply an AED to a patient who is conscious, breathing normally, or has a palpable pulse, as delivering an electric shock to a normal heart can induce dangerous arrhythmias.
While different manufacturers produce various models, every standard AED shares core components designed for rapid deployment under stress.
Rescuers must adapt AED use for specific environmental and patient conditions to ensure safety and effectiveness.
| Condition | Action Required |
|---|---|
| Implanted Pacemaker/ICD | Place pads at least one inch away from the device bulge to avoid damaging the unit. |
| Medication Patches | Remove the patch with gloved hands and wipe the skin clean before placing the pad. |
| Excessive Chest Hair | Shave the area rapidly if pads fail to stick well and create an air pocket. |
| Metal Surfaces / Water | Move the patient off conductive metal sheets and out of puddles to prevent shock hazard to bystanders. |
Equipment failures and environmental challenges can interrupt an emergency response. If the AED prompts 'Check Pads' or 'Poor Connection,' the rescuer should firmly press down on the adhesive edges to eliminate air pockets. If a low battery warning occurs, replace the unit or battery immediately if a backup is available. When pediatric patients under eight years old or under 25 kilograms require defibrillation, pediatric pads and an attenuator should be used if available; if not, standard adult pads are acceptable as a last resort, ensuring they do not overlap on a small chest.
Once the patient achieves a return of spontaneous circulation (ROSC), the nurse shifts focus to stabilization, monitoring, and detailed handover. Maintain airway patency, administer supplemental oxygen as ordered, and monitor vital signs continuously. Do not remove the AED pads immediately, as the patient may re-enter a shockable rhythm; leave them attached and connected to the device in monitoring mode. During clinical handover to the advanced medical team, provide a concise SBAR report detailing total downtime, number of shocks delivered, medications administered, and the patient's current hemodynamic status.