AED Pads use Gel for Adhesion
To help AED pads adhere to the skin properly, a gel is applied to the pads when they are manufactured. By seeping into the pores of the skin, the gel acts as a bonding agent between the sudden cardiac arrest patient and the AED pads. However, over time, the gel begins to dry out and the chemical makeup of the gel breaks down.
If AED pads are used beyond their expiration date, they will not adhere to the skin as well, particularly when cardiopulmonary resuscitation (CPR) is done. During CPR compressions, AED pads with poor adhesion may pull away from the skin, thus reducing the chances that the AED will provide effective analysis and therapy.