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The accuracy of the ECG varies with the condition being tested. Some heart conditions are not detectable all the time, and others may never produce any specific ECG changes.
A person who suspects heart disease or has had a heart attack may need more than one ECG. There is no reason for healthy people to undergo annual testing unless they have inherited risks or a medical condition.
It is important to be relaxed and relatively warm during ECG recording. Any movement, including muscle tremors such as shivering, can alter the tracing.
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