What is recommended to minimize interruptions in compressions when using an AED?

The answer

To minimize interruptions in compressions when using an AED, continue chest compressions while the AED is being retrieved and while the pads are being applied, and stop only when the AED tells you to — for rhythm analysis and, if advised, to deliver a shock. Any pause should last less than 10 seconds. The single most important predictor of survival in cardiac arrest is high-quality, continuous compressions, so every second the chest is not being compressed reduces blood flow to the brain and heart.

Why continuous compressions matter

Chest compressions generate the only blood flow a person in cardiac arrest gets. When you stop, coronary perfusion pressure drops almost immediately, and it takes several compressions after you restart to build pressure back up. This is why current CPR guidelines emphasize a high chest compression fraction — the proportion of time during a resuscitation that compressions are actually being performed. The target is to keep hands on the chest as much as possible.

The AED is designed to fit into this flow with minimal disruption:

1. One rescuer keeps compressing while a second rescuer retrieves and turns on the AED.
2. Pads are attached to the bare chest while compressions continue.
3. The AED announces 'Analyzing heart rhythm, do not touch the patient.' Only now do you briefly pause and clear the patient so the AED can read the rhythm.
4. If a shock is advised, everyone stays clear, the shock is delivered, and you immediately resume compressions — do not pause to check a pulse first.
5. If no shock is advised, resume compressions immediately.

Why the other approaches are wrong

• Stopping compressions as soon as the AED arrives is wrong — you should keep compressing while the pads are placed. Pausing early wastes valuable perfusion time.
• Checking for a pulse after a shock before resuming is wrong — guidelines say resume compressions right away; pulse checks add unnecessary interruption.
• Long pauses to 'set up' the AED are wrong — set-up (turning it on, attaching pads) should happen during ongoing compressions, not instead of them.
• Waiting to start CPR until the AED is ready is wrong — compressions should begin the moment arrest is recognized and continue until the AED forces a brief, defined pause.

The bigger picture: the under-10-second rule

The practical benchmark to remember is the 10-second rule: no interruption in compressions — for rhythm analysis, for shock delivery, for switching rescuers, or for a pulse check — should exceed 10 seconds. Coordinating the team helps: the compressor keeps going while the AED operator preps, rescuers pre-charge and pre-clear so the shock is ready the instant analysis ends, and compressions restart the second the shock is delivered. When rescuers switch (about every 2 minutes to prevent fatigue), the swap should be fast, ideally during the AED's rhythm analysis, so it costs no extra pause.

Memorize the concept for exams: compress continuously, pause only when the AED says to analyze or shock, and keep that pause under 10 seconds.