Feeling better after a heart attack can be reassuring, but the absence of chest pain or other symptoms does not necessarily mean the coronary arteries are clear. Significant narrowing or blockage can remain even when a person feels completely normal.
A heart attack occurs when blood flow to part of the heart muscle is reduced or blocked. The blockage may be complete or partial, depending on the type of heart attack. Once the immediate episode settles, symptoms can improve even though underlying coronary artery disease may still require treatment and monitoring.
Doctors can use tests such as an ECG, echocardiogram, stress testing, CT scans or coronary angiography to assess the heart and coronary arteries when clinically appropriate. A coronary angiogram can show whether arteries are narrowed or blocked and help doctors decide on treatment.
However, follow-up testing is not automatically required at regular intervals for every stable patient. American Heart Association and American College of Cardiology guidelines say routine periodic stress testing or coronary CT angiography is not recommended in patients whose symptoms and clinical status have not changed. Testing decisions should instead be based on the individual's condition and any new or worsening symptoms.
Follow-up after a heart attack remains important because secondary prevention includes medication, lifestyle changes, cardiac rehabilitation and monitoring of cardiovascular risk factors. The European Society of Cardiology also recommends structured follow-up after an acute coronary syndrome.

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