Depends: Undiagnosed structural heart problems can (very rarely) lead to a cardiac arrest in what appears to be an otherwise healthy person. Certain illegal drugs, particularly stimulants such as cocaine, also have the potential to cause rhythm problems that can lead to cardiac arrest.
Answered 7/7/2015
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Sick heart: If heart is not working well and if suddenly there is a high demand this can cause an arrest.
Answered 3/10/2018
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