What Is Supraventricular Tachycardia?

Supraventricular tachycardia (SVT) is a rapid heart rhythm of the upper heart chambers.  

In supraventricular tachycardia electrical signals travel from the upper chambers of the heart to the lower chambers of the heart.

In normal rhythm, the electrical impulse starts in the upper heart chambers and then travels through the A-V node, which is like a staircase connecting the top and bottom floors of a building.

The electrical signal in supraventricular tachycardia  starts in the upper chamber and then travels down the A-V node connecting the top and bottom chambers.  When the lower heart chamber is activated by the electrical signal reaching it, the lower chamber beats and pumps blood to the rest of the body.  The heart rate during the supraventricular tachycardia  is the rate that the lower heart chamber beats.


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