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USC - University of Southern California Cardiothoracic Surgery at University of Southern California Keck School of Medicine
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Glossary of Terms

A type of arrhythmia (abnormal heart rhythm) where the resting heart rate is faster than normal, or above 100 beats per minute.

During exercise or stress, the heart rate can rise above 100 beats per minute, but this is normal. Tachycardia that occurs when a person is at rest, and depending on the health status of the patient, may be harmful or life threatening.

Tachycardia may cause the heart to pump an insufficient amount of blood throughout the body, causing fainting, dizziness, shortness of breath, or fatigue.

Related terms: Bradycardia, Arrhythmia

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