title: Phase 4 left septal fascicular block.
authors.affiliation: Centro Cardiovascular Bella Vista, Buenos Aires, Argentina.
authors.forename: Martín
authors.initials: M
authors.lastname: Ibarrola
authors.affiliation: Centro de Arritmias Cardíacas de la Ciudad Autónoma de Buenos Aires, División Cardiología, Hospital General de Agudos J.M. Ramos Mejía, Buenos Aires, Argentina.
authors.forename: Pablo Ambrosio
authors.initials: PA
authors.lastname: Chiale
authors.affiliation: Cardiology Discipline, ABC Medical Faculty, ABC Foundation, Santo André, São Paulo, Brazil.
authors.forename: Andrés Ricardo
authors.initials: AR
authors.lastname: Pérez-Riera
authors.affiliation: Heart Rhythm Service, Kingston General Hospital, Queen's University, Kingston, Ontario, Canada. Electronic address: barancha@kgh.kari.net.
authors.forename: Adrian
authors.initials: A
authors.lastname: Baranchuk
mesh_terms: D000369:Aged, 80 and over; D002036:Bundle of His / Q000503:physiopathology*; D002037:Bundle-Branch Block / Q000175:diagnosis* / Q000503:physiopathology; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D014672:Vectorcardiography / Q000379:methods*
keywords: Left septal fascicular block; Phase 4 bradycardia-dependent block; Prominent anterior QRS forces