Refers to s supraventricular tachycardia (SVT) that does not require the AV junction, accessory pathways, or ventricular tissue for initiation and maintenance of the tachycardia.
Electrocardiogram typically shows a narrow QRS complex tachycardia.
Heart rates from 100-250 beats per minute.
Atrial rhythm is usually regular.
Conducted ventricular rhythm is usually regular as well, but may become irregular at higher atria rates because of variable conduction through the AV node producing Wenckebach AV blocks.
P waves may provide clues to the site of origin and mechanism of the atrial tachycardia.