• Abnormally rapid heartbeat, usually with a heart rate above 100 beats per minute for adults. Tachycardia accompanied by disturbance in the cardiac depolarization (cardiac arrhythmia) is called tachyarrhythmia.
  • An abnormally rapid heartbeat, usually applied to a heart rate above 100 per minute.
  • Excessive rapidity in the action of the heart.
  • Rapid beating of the heart, usually defined as greater than 100 beats per minute.
  • Tachycardia; an abnormally rapid heartbeat, usually applied to a heart rate above 100 per minute.