CPR is the act in which you are doing repeated compressions on the chest of someone who has no pulse. The act of CPR is to attempt to restore blood flow and breathing of a person who is going through a cardiac arrest. The ratio of compressions to rescue breaths to compressions is 30:2.
AED is an electronic device that diagnoses life-threatening cardiac rhythms and delivers a shock to restore a normal heart rhythm within a patient. There are only 2 shockable heart rhythms which are;
Ventricular fibrillation, ventricular tachycardia