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Supraventricular Tachycardia (SVT)
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Cardiac diseases often affect the area above the ventricles in the artia, causing an elevated heartbeat. The artia of the heart receives blood returning to the heart from other areas of the body.

Artial Fibrillation
Irregular and often rapid heart rate that commonly causes poor blow flow to the body.

Atrial Flutter
Overly rapid regular contraction of the atrium of the heart.

Atrioventricular Nodal Reentry Tachycardia (AVNRT)
AVNRT is the most common form of SVT. In patients with this condition, the atrioventricular node is divided into two longitudinal pathways that form the reentrant circuit. AVNRT is caused by the circular movement of electricity between the slow and fast pathways of the circuit. The slow pathway and fast pathway allow the AV node to receive multiple signals causing a fast heartbeat. The condition is typically well tolerated and often occurs in patients with no structural heart disease. AVNRT accounts for 80-90% of all SVTs.

Atrioventricular Reciprocating Tachycardia (AVRT)
AVRT is the second most common type of SVT, accounting for about 30% of all SVTs. Patients with AVNRT have been born with an extra, abnormal electrical connection in the heart. The extra connection joins one of the upper chambers of the heart (atria) with one of the lower chambers (ventricles). AVRT occurs when the heart beats too fast due to the extra electrical pathways between the upper and lower chambers.

Junctional (AV Nodal) Tachycardia
Junctional Tachycardia can be temporary (Automatic Junctional Tachycardia) or persistent (Junctional Reentrant Tachycardia, PJRT). Automatic junctional tachycardia can be caused by drug toxicity or unknown cause.