Tachycardia

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). In humans, the upper threshold of a normal heart rate is usually based upon age, sometimes it can be very dangerous depending on how hard the heart is working and the activity: When the heart beats rapid... more
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