title: Correlation of P-wave polarity with underlying electrophysiologic mechanisms of long RP' tachycardia.
abstract: Analysis of surface electrocardiograms from patients with long RP' tachycardia due to either atypical atrioventricular node reentrant tachycardia, permanent junctional reciprocating tachycardia, or low atrial tachycardia was performed. Although a negative P wave in the inferior leads is common to all 3 mechanisms, the results suggest that a positive or isoelectric P wave in electrocardiographic lead I strongly supports a diagnosis of atypical atrioventricular node reentrant tachycardia, whereas a negative or biphasic P wave in lead I argues against this mechanism.
authors.affiliation: Cardiac Electrophysiology and Arrhythmia Service, Division of Cardiovascular Medicine, Stanford University Medical Center, California 94305, USA.
authors.forename: K S
authors.initials: KS
authors.lastname: Ng
authors.forename: M R
authors.initials: MR
authors.lastname: Lauer
authors.forename: C
authors.initials: C
authors.lastname: Young
authors.forename: L B
authors.initials: LB
authors.lastname: Liem
authors.forename: R J
authors.initials: RJ
authors.lastname: Sung
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D004562:Electrocardiography; D005260:Female; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000175:diagnosis / Q000503:physiopathology; D013617:Tachycardia, Supraventricular / Q000175:diagnosis* / Q000503:physiopathology