If there is no pulse present at all (no carotid artery pulsating) then compressions should begin. Along with no pulse though, normal respirations will be absent (patients have been known to have false respirations, burp-like breaths that aren't actually taking in air. They aren't steady, they are apneustic) They obviously will be unconscious, possibly becoming cyanotic, and have no capillary refill.
Fluids may be built up in their airway and come out of their mouth and nose. Sudden collapse of an adult is a sign of cardiac arrest.
A person who is unresponsive and not breathing requires immediate CPR for the best chance of survival. Cessation of breathing means the brain, heart and other organs and body tissues are not receiving oxygen needed for survival. A rescuer should assess an unresponsive person for breathing by gently pressing back on the victim's forehead to tilt the head slightly up.
The mouth should be slightly opened, and a rescuer should watch the victim's chest for movement, while listening and feeling for breath. The Mayo Clinic offers that the absence of oxygen to the brain can result in brain damage within a few minutes. If there are no signs of breathing, CPR should begin to hasten return of oxygen circulating to the brain and through the body.
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