Atrial Tachycardia Overview. Atrial tachycardia is a form of supraventricular tachycardia, originating within the atria but outside of the sinus node. Both atrial flutter and multifocal atrial tachycardia are specific types of atrial tachycardia. AKA: Paroxysmal Atrial Tachycardia (PAT), unifocal atrial tachycardia, ectopic atrial tachycardia

