title: A specific sign for differential diagnosis of atypical atrioventricular nodal reentrant tachycardia from atrial tachycardia.
abstract: Narrow QRS tachycardia with atrial activation occurring before ventricular activation was induced in a 34-year-old woman with dilated cardiomyopathy. During tachycardia late ventricular extrastimulus delivered when His bundle was refractory failed to reset the tachycardia while early ventricular extrastimulus caused paradoxical delay of the subsequent atrial response and terminated the tachycardia with a QRS not being followed by an atrial response. This is a rare but specific sign for excluding atrial reentry as the mechanism of tachycardia when P wave or atrial activation is registered before QRS response.
authors.affiliation: Department of Molecular and Internal Medicine, Graduate School of Biomedical Sciences, Hiroshima University, Minami-ku, Hiroshima, Japan. sesekys@hotmail.com
authors.forename: Yukoh
authors.initials: Y
authors.lastname: Hirai
authors.forename: Ming-Shien
authors.initials: MS
authors.lastname: Wen
authors.forename: San-Jou
authors.initials: SJ
authors.lastname: Yeh
authors.forename: Delong
authors.initials: D
authors.lastname: Wu
mesh_terms: D000328:Adult; D001281:Atrial Fibrillation / Q000175:diagnosis*; D003937:Diagnosis, Differential; D004562:Electrocardiography / Q000379:methods*; D005260:Female; D006801:Humans; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000175:diagnosis*