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Patent Pending Supraventricular tachycardia (SVT)[1][2] is a cardiac arrhythmia arising from improper electrical activity of the heart. It is a type of tachycardia (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.