What is Supraventricular Tachycardia (SVT)?

Supraventricular Tachycardia, most commonly referred to as SVT, is the most common type of abnormal fast heart rhythms in children. SVT is a broad term and includes many different forms all with similar types of symptoms.

The type of SVT is classified based on the path of electrical signal during the tachycardia. SVT begins in the upper chambers of the heart, (Atria), travels through an abnormal electrical circuit within the AV node (AV Node Reentrant Tachycardia or AVNRT), or, through an extra abnormal pathway, called an accessory pathway or bypass tract (AV Reentrant Tachycardia or AVRT). An accessory pathway is an extra band of tissue/fibers that connect the atria to the ventricles.

Understanding Supraventricular Tachycardia