Heart attack A heart attack, also known as a myocardial infarction, is a medical emergency that occurs when the blood supply to a part of the heart muscle is completely blocked, leading to damage or death of the heart muscle. This condition typically results from
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Atrial fibrillation Atrial fibrillation (AFib) is a common heart rhythm disorder characterized by irregular and often rapid heartbeats. It occurs when the upper chambers of the heart, called the atria, quiver or fibrillate instead of contracting normally. This irregular electrical activity can lead to
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