title: Electrocardiography series. Narrow QRS-complex tachycardia: part 2.
abstract: We discuss two cases of incessant atrial tachycardia (AT), including the presentation and clinical course. It is important to differentiate AT from other causes of supraventricular tachycardia, such as atrioventricular nodal reentrant tachycardia (AVNRT) and atrioventricular reentrant tachycardia (AVRT), as it would have implications on clinical management. Electrocardiographic features of AT, especially the presence of an AV Wenckebach phenomenon with 'grouped beating', are critical for differentiating AT from AVRT and AVNRT. It is also vital to identify the P waves and their relations to QRS on electrocardiography, as this would aid in the differentiation of various supraventricular tachycardias.
authors.forename: Devinder
authors.initials: D
authors.lastname: Singh
authors.forename: Swee-Guan
authors.initials: SG
authors.lastname: Teo
authors.forename: Abdul Razakjr Bin
authors.initials: AR
authors.lastname: Omar
authors.affiliation: Department of Cardiology, National University Heart Centre, 1E Kent Ridge Road, NUHS Tower Block, Level 9, Singapore 119228. kian_keong_poh@nuhs.edu.sg.
authors.forename: Kian Keong
authors.initials: KK
authors.lastname: Poh
mesh_terms: D000368:Aged; D003937:Diagnosis, Differential; D004562:Electrocardiography; D004594:Electrophysiology; D005260:Female; D006329:Heart Conduction System / Q000002:abnormalities; D006439:Hemodynamics; D006801:Humans; D008297:Male; D012119:Respiration; D013610:Tachycardia / Q000175:diagnosis*; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000175:diagnosis*; D013617:Tachycardia, Supraventricular / Q000175:diagnosis*; D014261:Tricuspid Valve / Q000503:physiopathology