If you suspect a problem with respect to consciousness, call 911 immediately because the process can be slow and it is imperative to get help as soon as possible. Why? Because you need expertise, help, materials, meds and more.

Also, with adults, the most common cause of falling unconscious is a cardiac problem in which case you need a defibrillator. Moreover, there are exceptions when you first perform 2 minutes of first-aid and then go call 911 (see the technique section). The explanation being that those emergencies affect the respiratory system primarily as opposed to the cardiovascular system. Opening the airway and giving breaths precedes calling 911 because you can save the victim's life.

how well do you know your stuff?