Tachycardia comes from the Greek words tachys (rapid or accelerated) and kardia (of the heart).
• 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 heart rate (heart rate in an inactive or sleeping individual).
• It can be very dangerous depending on how hard the heart is working and the activity. When the heart beats rapidly, the heart pumps less efficiently and provides less blood flow to the rest of the body, including the heart itself.
• The increased heart rate also leads to increased work and oxygen demand for the heart (myocardium), which can lead to rate related Ischemia thus perhaps causing a heart attack (myocardial infarction) if it persists. This occurs because the decreased flow of necessary oxygen to the heart causes myocardial cells to begin to die off. Acutely, this leads to angina; and chronically to ischemic heart disease.