Yes. For children under 8 years old or weighing less than 25 kg, the AED’s child mode should be used. If the child’s age is uncertain, the adult mode can be used. 

1）If there is standing water around the patient (e.g., pools, floodwater), move the patient to a dry area immediately to avoid electric shock to the rescuer or the patient due to current conduction through water. If moving the patient is not possible, try to place insulating materials like clothing or towels underneath them, or dry the contact areas as much as possible.
2）If the patient's chest is wet (from sweat, rain, or other liquids), quickly dry the area with a towel or clothing to ensure the electrode pads adhere properly to the skin.
3）When using the AED in the rain, try to shield the patient's chest with waterproof materials (such as plastic sheeting) and perform the operation quickly. The AED has a certain level of water resistance, but ensuring good contact of the electrode pads is the top priority.
4）If the patient is submerged in water (e.g., in a pool or bathtub), remove them from the water completely and dry their body thoroughly before using the AED. 

Yes. Pacemakers or implantable defibrillators are usually placed under the left collarbone, either beneath the pectoral muscle or under the skin. Therefore, when using an AED, simply avoid placing the electrode pads directly over the implanted device.    

Yes, but the patient should be kept as stable as possible to minimize motion interference.