Final answer:
For adults and children 8 years or older, AED pads should be placed in the anterolateral position: one on the right upper chest and the other under the left chest wall side. CPR should be performed before using an AED if necessary.
Step-by-step explanation:
When using an automated external defibrillator (AED) for adults and children 8 years or older, the anterolateral pad placement is recommended. One pad should be placed on the victim's right upper chest, just below the clavicle, and the second pad should be placed under the left chest wall, on the side of the left nipple, with the top edge of the pad a few inches below the armpit.
This placement is known as the anterolateral position and allows for the most effective delivery of the electric shock during cardiopulmonary resuscitation (CPR). Prior to using the AED, it's common practice to perform CPR to circulate blood and oxygen throughout the body, if the victim is not breathing normally.