Focal atrial tachycardia

ECG

Focal atrial tachycardia (focal AT) is usually a regular tachycardia with an atrial rate typically between 100 and 250 bpm. The ECG must show atrial P waves, and their morphology should be different from the P waves in sinus rhythm. There is typically an isoelectric segment between P waves. At times, irregularity is seen, especially at onset (warm-up) and termination (warm-down).

Focal AT is diagnosed based on the 12-lead ECG and exclusion of alternative tachyarrhythmic diagnoses through observation of response to maneuvers.