Rapid heartbeat
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In most cases, patients with a heart attack develop a rapid heartbeat that is often associated with fear and apprehension, but in other cases, it is a body reflex to increase blood flow in the heart tissue. A rapid heartbeat is also a cause of myocardial infarction, especially when it triggers arrhythmia, which may contribute to creating blood clots that will travel through the coronary arteries and precipitate a heart attack. This is why taking your heart rate is one of the things doctors will do if they suspect a heart disease, and they will even need an electrocardiogram to rule out arrhythmia and other complications associated with a rapid heartbeat.