A supraventricular tachycardia is tachycardia (heart rate > 100) that originates above the AV node, in the atria. There are several different forms of supraventricular tachycardia, including sinus tachycardia, atrial fibrillation, atrial flutter, atrial tachycardia, multifocal atrial tachycardia, and a nebulous condition called paroxysmal supraventricular tachycardia (PSVT). Many people also consider junctional tachycardia a supraventricular tachycardia.