What should you do immediately if an AED indicates a "no shock advised" message?

When an AED indicates a "no shock advised" message, the appropriate action is to resume CPR, starting with chest compressions. This is essential because the patient is still in a state of cardiac arrest and requires immediate attention to maintain blood circulation and oxygenation until advanced medical help arrives or the situation changes.

Resuming CPR is critical because it can significantly improve the patient’s chance of survival by keeping blood pumping to vital organs, particularly the brain. It is important to continue performing high-quality chest compressions at the appropriate rate and depth, as this helps to provide blood flow to the heart and brain.

Other actions, such as checking for a pulse or waiting too long for reanalysis, do not provide immediate assistance to the patient. Continuing CPR without delay maximizes the likelihood of a successful resumption of normal heart rhythm and improves the outcomes for the patient.