Tachycardia comes from the Greek words tachys (rapid or accelerated) and kardia (of the heart). Tachycardia typically refers to a heart rate that exceeds the normal range for a resting heartrate (heartrate in an inactive or sleeping individual). It can be very dangerous depending on how hard the heart is working and the activity. The upper threshold of a normal human heart rate is usually based upon age:Read more on Wikipedia
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