title: Diagnostic dilemma with a narrow QRS regular rhythm at normal rates in a patient with corrected transposition of great arteries.
abstract: A 35 year old male, known case of corrected transposition of great arteries presented with exertional dyspnea and recurrent pre-syncope. 12 lead electrocardiogram revealed a regular rhythm at 75 beats per minute, P waves occurring on the upstroke of T waves and apparent 1:1 P-QRS relationship. The possibilities to be considered - complete AV block with junctional escape, junctional rhythm with 1:1 retrograde conduction, junctional rhythm with isorhythmic AV dissociation and prolonged PR interval have been discussed.
authors.affiliation: Electrophysiology Unit, Department of Cardiology, Sri Jayadeva Institute of Cardiovascular Sciences & Research, Bannerghatta Road, Jayanagar 9th Block, Bangalore 560069, Karnataka, India.
authors.forename: Jayaprakash
authors.initials: J
authors.lastname: Shenthar
authors.affiliation: Electrophysiology Unit, Department of Cardiology, Sri Jayadeva Institute of Cardiovascular Sciences & Research, Bannerghatta Road, Jayanagar 9th Block, Bangalore 560069, Karnataka, India.
authors.forename: Maneesh K
authors.initials: MK
authors.lastname: Rai
keywords: AV dissociation; First degree AV block; Junctional rhythm; Prolonger PR interval