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Differences between cardiac arrest and heart attack

  • A heart attack occurs when a blocked artery prevents oxygen-rich blood from reaching a section of the heart. If the blocked artery is not reopened quickly, the part of the heart normally nourished by that artery begins to die. The longer a person goes without treatment, the greater the damage.

  • Sudden cardiac arrest occurs suddenly and often without warning. It happens when an electrical malfunction in the heart causes an irregular heartbeat (arrhythmia). With its pumping action disrupted, the heart can't pump blood to the brain, lungs and other organs. When this occurs, a person loses consciousness and has no pulse. Death occurs within minutes if the victim doesn't receive treatment. 

Heart Attack and Sudden Cardiac Arrest Differences | American Heart Association

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