If a victim is unresponsive, what should you do first?

In an emergency situation where a victim is unresponsive, the first step is to call for emergency medical services (EMS) and to obtain an automated external defibrillator (AED). The rationale behind this is that the victim may not be breathing or may be in cardiac arrest, which requires prompt medical intervention. Calling EMS initiates the process of getting professional help as quickly as possible, which is critical for the victim's survival.

Obtaining an AED is also vital because it can provide life-saving shocks to restore a normal heart rhythm if needed. The AED is an essential tool in cases of cardiac arrest, and having it available as soon as possible can significantly increase the chances of survival.

Checking for breathing or performing CPR can be important steps but should come after the rapid activation of EMS and securing an AED. The initiation of CPR would follow if the victim shows no signs of breathing, but securing emergency services should always be the first action taken.