It depends: EKGs after heart attacks may show the "scar" for many years, but some EKGs normalize over time, depending on the size and location of the heart attack. On the other hand, EKGs read as "heart attacks" may be false positives and the heart be completely normal. Kind of confusing, isn't it? Ask the same question with EKG in hand to your cardiologist and he will be able to explain.
Answered 5/8/2014
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