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Cardiovascular Institute > About Us > Conditions > Arrhythmias > Supraventricular Tachycardia

Supraventricular Tachycardia

Supraventricular tachycardias (SVT) are common rapid heart rhythms that can occur suddenly, without warning. They can cause the heart to beat up to 200 bpm. These heart rhythm disturbances are caused by duplication of the heart’s electrical circuitry. Although this duplication occurs even before birth, patients may not experience arrhythmias until they reach the age of 20 or 30, or even later in life.

During an SVT the heart’s normal electrical signals travel from the upper heart chambers to the lower heart chambers and then utilizing the duplicate electrical circuit, the signals circle around back up to the top of the heart chambers. The reentry loop of heart beats allows the heart to beat rapidly without he body’s ability to regulate it.

Click on the images below for a larger view

 

Catheter Ablation  Catheter Ablation

Types

  • Atrioventricular nodal reentrant tachycardia (AVNRT) – Electrical signals travel around the AV node in a circular motion, as if going around a racetrack.
  • Atrioventricular reciprocating tachycardia (AVRT) – Electrical signals go down one staircase from the top chamber to the bottom chamber and then take the second staircase from the bottom chamber, back up to the upper chamber. This condition is sometimes called Wolf-Parkinson-White or WPW syndrome. These arrhythmias are usually genetically acquired and range in seriousness from benign symptoms to even fatal events.

Symptoms

SVT usually has no symptoms and can start and end quickly. Symptoms can include:

  • Heart palpitations
  • Fast pulse
  • Chest pain
  • Lightheadedness and fainting

Treatment

The common first-line approach to therapy are medications such as beta-blockers and calcium channel blockers. These medications can sometimes suppress and slow the arrhythmia, but they are not curative. The standard approach for symptomatic SVT is a minimally-invasive approach called an ablation procedure. By placing a catheter in the heart, the Heart Rhythm Center can locate the extra electrical pathways and melt them away, preventing any further consequences of fast heart rhythms.

For a consultation with the Ben and Zelda Cohen Heart Rhythm Center and a discussion of the right therapy for your arrhythmia, please call 410-601-WELL.

 

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Cardiovascular Institute at LifeBridge Health
2401 W. Belvedere Ave.
Baltimore, MD 21215
Contact Us: 410-601-9000

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