An adult heart rate of over 100 beats per minute. The average heart rate is 72–78 beats per minute. Tachycardia occurs in healthy people during exercise. At rest, it may be due to fever, anxiety, hyperthyroidism, coronary artery disease, high caffeine intake, or treatment involving anticholinergic or diuretic drugs. There are various types of tachycardia, which originate in different areas of the heart; the types include atrial fibrillation, sinus tachycardia, supraventricular tachycardia, and ventricular tachycardia.


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