Supraventricular tachycardia
![](/Images/godic/202502/03/SVT_Lead_II-21105.JPG")
![Impulse arising in SA node, traversing atria to AV node, then entering ventricle. Rhythm originating at or above AV node constitutes SVT.](/Images/godic/202502/03/Heart_conduct_sinus1105.gif")
![Atrial fibrillation: Irregular impulses reaching AV node, only some being transmitted.](/Images/godic/202502/03/Heart_conduct_atrialfib1106.gif")
![Holter monitor-Imaging with start (red arrow) and end (blue arrow) of a SV-tachycardia with a pulse frequency of about 128/min.](/Images/godic/202502/03/SV_Tachycardia_marked1106.jpg")
Supraventricular tachycardia (SVT) is an abnormal heart rhythm arising from improper electrical activity of the heart. It is a type of rapid heart rhythm originating at or above the atrioventricular node. It can be contrasted with the potentially more dangerous ventricular tachycardias—rapid rhythms that originate within the ventricular tissue.