The importance of P wave morphology on the ECG

Focal atrial tachycardia (AT) is the least common form of supraventricular tachycardia. However, the surface 12-lead ECG is a very helpful tool and the use of P-wave morphology (PWM) on surface ECG to localise the site of focal AT is of paramount importance. Subtle ECG changes with respect to PWM in AT could be mistaken as sinus rhythm (SR). We report a case of a young woman with focal AT located at the tricuspid annulus in which the heart rate in both …