Atrial flutter, atrial fibrillation, and other primary atrial tachycardias.

Traditional classifications of atrial tachycardias include not only rhythm disturbances arising primarily within the atria, but also dysrhythmias in which it is now recognized that participation of both atrial and non-atrial tissue is required. We prefer to consider those arrhythmias in which the atria are the principal site of electrophysiologic disturbance as "primary" atrial tachyarrhythmias. The mechanisms, diagnosis, and treatment of these "primary" atrial tachycardias are the subject of this article.