Objectives: The purpose of this study was to perform a detailed analysis of the P-wave
morphology (PWM) in focal atrial tachycardia (AT) and construct and prospectively evaluate
an algorithm for identification of the anatomic site of origin. Background: Although smaller
studies have described the PWM from particular anatomic locations, a detailed algorithm
characterizing the likely location of a tachycardia associated with a P-wave of unknown
origin has been lacking. Methods: The PWMs for 126 consecutive patients undergoing …

Background: We present a detailed analysis of the P wave morphology in a large
consecutive series of patients undergoing successful RF ablation for focal AT and describe
its utility for identification of the anatomic site of origin. Methods: The P wave morphology for
125 consecutive patients undergoing successful RFA of 129 ATs are reported. P waves
were only included when the onset was preceded by an isoelectric segment and there was
no QRS or T wave superimposition (during AV block). P waves were classified as pos (+) …