Final answer:
If you receive a no shock message while using an AED, you should continue CPR. Administering a shock using the AED is only necessary if advised by the device. Properly placing the AED pads is important for effective delivery of the shock.
Step-by-step explanation:
If you receive a no shock message while using an AED on a 60-year-old man in cardiac arrest, you should continue CPR. CPR helps maintain blood flow to the heart and brain, which is crucial in a cardiac emergency. Administering a shock using the AED is only necessary if the device advises it. Checking the AED pads for proper placement is also important to ensure effective delivery of the shock.