<unk>  leads to a loss of cardiac output, and the blood supply to the brain is interrupted. As a result,<unk>  is usually noticed when a person loses consciousness and stops breathing spontaneously. This is confirmed by examining the airway for obstruction, observing the chest for respiratory movement, and feeling the pulse (usually at the carotid artery) for a period of 10 seconds.
Pulseless electrical activity
Electrical alternans
Ventricular escape beat
Hyperdynamic precordium
High frequency QRS
Infradian rhythm
Junctional escape beat
Pulsus alternans