How can an artery spasm bring on a heart attack?
It’s unusual, but a coronary artery spasm can cause a heart attack. The muscle that lines coronary arteries can contract or relax. During a spasm, the arteries contract without warning, cutting blood supply to heart muscle and causing a heart attack.
The amount of damage to the heart muscle depends on the size of the area supplied by the blocked artery and the time between injury and treatment. Earlier treatment can reduce the impact of the heart attack.
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