title: Pre-excitation syndrome with a change in terminal QRS vector.
abstract: Most accessory pathways in pre-excitation syndrome are capable of antegrade conduction from atrium to ventricle, and identified by characteristic ECG abnormalities such as a delta wave (ventricular pre-excitation) and a shortened PR interval.Therefore, the traditional diagnosis method is to detect the initial changes of the QRS complex. Here we report a patient initially mistaken as having atrioventricular re-entrant tachycardia (AVRT) and concealed pre-excitation syndrome. A diagnosis of incomplete latent pre-excitation syndrome was established on the basis of differences between the ECGs during sinus rhythm and AVRT in terminal QRS vectors, demonstrated by intracardiac electrophysiological radiofrequency catheter ablation.
authors.affiliation: The Cardiovascular Institute of the First Affiliated Hospital of Liaoning Medical College in Jinzhou, Liaoning Province, China. liurenguanglaoshi@126.com
authors.forename: Renguang
authors.initials: R
authors.lastname: Liu
authors.forename: Juan
authors.initials: J
authors.lastname: Chen
mesh_terms: D058606:Accessory Atrioventricular Bundle / Q000503:physiopathology; D003937:Diagnosis, Differential; D004562:Electrocardiography; D022062:Electrophysiologic Techniques, Cardiac; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011226:Pre-Excitation Syndromes / Q000175:diagnosis* / Q000503:physiopathology*; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000175:diagnosis