In which scenario should you not use a defibrillator?

A defibrillator should not be used in the presence of flammable materials because the electrical discharge it generates can ignite those materials, leading to significant risk of fire or explosion. Ensuring safety for both the patient and bystanders is crucial, and avoiding defibrillation in such an environment minimizes those risks.

In scenarios where a patient has a pulse, using a defibrillator is unnecessary as it is intended to restore a heart rhythm in cases of cardiac arrest. Laying a patient on a hard surface is usually appropriate, as it allows for effective conduction of electricity from the defibrillator. Following a seizure, it may still be appropriate to use a defibrillator, provided the patient is unresponsive and not breathing normally, since seizures typically don't eliminate the need for emergency cardiac intervention.