Sudden Cardiac Arrest vs. Heart Attack

People often confuse sudden cardiac arrest and heart attacks. They are not the same thing. A defibrillator will do nothing for someone who is having a heart attack. A simple way to know the difference is to remember that a heart attack is a plumbing issue (there’s blockage) while a sudden cardiac arrest is an electrical issue (the heart goes into fibrillation).

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(Source: The Health & Safety Institute)