Answer :

The special circumstance that a rescuer should consider when using an AED (Automated External Defibrillator) is the presence of water or moisture.

When using an AED, it is important to consider the presence of water or moisture in the surroundings or on the victim's body. Water is a conductor of electricity, and if the victim or the area around them is wet, it can increase the risk of an electric shock to both the victim and the rescuer. If the victim is in or near water, the rescuer should make sure to move them to a dry area before using the AED. If the victim's chest or the electrode pads are wet, it is crucial to dry the area before applying the pads to ensure proper adhesion and conduction of the electrical current.

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