Tachycardia | Fast Heart Rate

Updated:Sep 3,2014

View an animation of tachycardia (opens in new window)

Tachycardia = Too fast

A heart rate of more than 100 beats per minute (BPM) in adults is called tachycardia. What's too fast for you may depend on your age and physical condition.

View an animation of tachycardia.

There are three types of tachycardias:

Atrial or Supraventricular tachycardia (SVT) is a fast heart rate that starts in the upper chambers of the heart.

Some forms are called paroxysmal atrial tachycardia (PAT) or paroxysmal supraventricular tachycardia (PSVT).

How it happens
Electrical signals in the heart's upper chambers fire abnormally, which interferes with electrical signals coming from the sinoatrial (SA) node --- the heart's natural pacemaker. A series of early beats in the atria speeds up the heart rate. The rapid heartbeat does not allow enough time for the heart to fill before it contracts so blood flow to the rest of the body is compromised.

Who is likely to have Atrial or SVT?

  • SVT is the most common type of arrhythmia in children
  • More common in women, but may occur in either sex
  • Anxious young people
  • People who are physically fatigued
  • People who drink large amounts of coffee
  • People who drink alcohol heavily
  • People who smoke heavily
Atrial tachycardia occurs less commonly with: Symptoms and Complications of Atrial or SVT
Some people have no symptoms; others may feel:
  • Dizziness
  • Lightheadedness
  • Rapid heartbeat or "palpitations"
  • Angina (chest pain)
  • Shortness of breath
In extreme cases, atrial or SVT may cause: Treatment for Atrial or SVT
Many people don't need medical therapy. Treatment is considered if episodes are prolonged or occur often. Your doctor may recommend or try:
  • Carotid sinus massage: gentle pressure on the neck, where the carotid artery splits into two branches. Must be performed by a healthcare professional to minimize risk of stroke, heart or lung injury from blood clots.
  • Pressing gently on the eyeballs with eyes closed.
  • Valsalva maneuver: holding your nostrils closed while blowing air through your nose.
  • Dive reflex: the body's response to sudden immersion in water, especially cold water.
  • Sedation.
  • Cutting down on coffee.
  • Cutting down on alcohol.
  • Quitting tobacco use.
  • Getting more rest.
  • In patients with Wolfe-Parkinson-White Syndrome, medications or ablation may be needed to control PSVT.
 





This content was last reviewed on 05/30/2012.

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