If you go into cardiac arrest and an AED or external defibrillator is available, it should always be used. Do not hesitate because of your ICD. Saving your life takes priority.
An external shock can occasionally alter your ICD’s programmed settings or, in rare cases, cause minor damage to the device. For this reason, your ICD should be checked by your device clinic as soon as possible after any external defibrillation, even if you feel well. The clinic will test the device and confirm it is functioning and correctly programmed.
If you carry an ICD identification card, it can help emergency responders understand your situation, though it should never delay the delivery of a shock if one is needed.