Supraventricular (originating above the ventricles) tachycardia (SVT) is a name given to any arrhythmia that originates in the top chambers of the heart- also know as the atria. There are many types of SVTs. SVTs can cause symptoms of palpitations, fatigue, or shortness of breath. They typically start suddenly and stop suddenly, and may last for minutes or hours, with a rapid but steady pulse during the episode. The fast rhythm is usually caused by either an irritable spot that fires rapidly (atrial tachycardia, or AT), or by an electrical “short circuit” that involves an extra electrical connection between the top and bottom chambers of the heart (atrioventricular node reentry, AVNRT, or atrioventricular reentry with an accessory pathway, AVRT). Treatment options include medications or a catheter ablation procedure. Learn More