title: A narrow QRS complex Tachycardia with an apparently concentric retrograde atrial activation sequence.
abstract: The retrograde atrial activation sequence constitutes an initial important clue to elucidate the tachycardia mechanism during diagnostic electrophysiological testing in patients with supraventricular tachycardia. However, in some cases its correct analysis is challenging.
authors.affiliation: Cardiac Arrhythmia and Electrophysiology Unit. Department of Cardiology. Hospital Virgen de la Salud. Toledo. Spain. maapalomares@secardiologia.es
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Arias
authors.forename: Eduardo
authors.initials: E
authors.lastname: Castellanos
authors.forename: Alberto
authors.initials: A
authors.lastname: Puchol
authors.forename: Marta
authors.initials: M
authors.lastname: Pachon