Final answer:
The main legal risk in using an AED is failing to deliver a shock when one is needed. AEDs are designed for use by laypersons and can diagnose heart rhythms to determine if a shock is necessary.
The failure to follow the device's instructions could result in legal implications.
Step-by-step explanation:
The main legal risk in using an automated external defibrillator (AED) is failing to deliver a shock when one is needed. AEDs are designed for use by laypersons and are equipped with an internal computer chip that diagnoses the heart's rhythm, determining if a shock is necessary to correct an arrhythmia like ventricular fibrillation.
The user's responsibility is to follow the AED's instructions; a failure to do so could lead to legal risks, typically under the claim of negligence. AEDs are commonly found in public places and are designed to give instructions and apply shocks without the need for extensive medical knowledge. It's important to note that CPR is often recommended before AED use.