Eli5: what is the difference between a heart attack and a cardiac arrest?
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What happened to Damar was a cardiac arrest. The rhythm was disrupted so his heart was beating in a disorganized fashion and failing to actually pump any blood. This was caused by his heart getting a hard strike at just the right moment. There are other things that can cause a similar disruption. If the rhythm can get restored with a defibrillator, the heart can continue beating.
With a heart attack, the heart is stopped by a blockage or some other mechanical reason. Until that gets addressed, the heart will not be able to go back to its full function.
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