Answer:
There are several factors that can prevent or interfere with the use of an automated external defibrillator (AED). These include the presence of dangerous or aggressive bystanders, pets that may be agitated or aggressive, flammable gases or liquids, and substances such as vomit, saliva, urine, or a damp swimsuit that may interfere with the proper operation of the AED. It is important to assess the situation and take appropriate precautions before attempting to use an AED in order to ensure the safety of the rescuer and any bystanders. However, it is important to use the AED as quickly as possible in order to try to resuscitate the victim, even if these hazards are present.