Atrioventricular Nodal Reentry Tachycardia (AVNRT)

Atrioventricular Nodal Reentry Tachycardia (AVNRT) is a heart arrhythmia with abnormal signals that reenter in the area of the AV node of the heart. A fast pathway and a slow pathway allow the AV node to receive multiple signals causing a fast heartbeat.

The electrical system of the heart is made up of several parts that communicate with one another to signal the heart muscle fibers when to contract. The SA node starts the signal causing the atria to contract. This signal travels through the AV node and on to the bundle of His, bundle branches, and Purkinje fibers causing the ventricles to contract. The flow of electrical signals is what produces a normal heartbeat.

In AVNRT, electrical pulses that originate in the heart’s upper chambers travel to a fast and a slow pathway in the AV node. When the SA node sends an electrical signal it passed through the fast pathway of the AV node and into the ventricles. A slow pathways slows the signals from the SA node long enough to send another signal into the ventricles. This causes the heart to beat rapidly.


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