title: Tachycardia-dependent bilateral bundle branch block in ischemic heart disease with systolic dysfunction: case report and review of prognostic implications.
abstract: A proper characterization of frequency-dependent bundle branch blocks can provide useful prognostic information in some clinical situations. Often, this physiological event may be due to an extensive damage of infrahisian system, which poses a high risk of developing advanced atrioventricular block requiring pacemaker implantation. We describe the case of a 62 year-old man with chronic ischemic heart disease who exhibited alternating tachycardia-dependent bundle branch block during stress test. We discuss the main prognostic implications of this unusual event in the context of systolic dysfunction.
authors.affiliation: Centro Cardiovascular Universitario, Hospital de Clínicas, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay. Address: Hospital de Clínicas, Avda. Italia s/n, piso 2, Montevideo, Uruguay. Email: federico.ferrando@gmail.com.
authors.forename: Federico
authors.initials: F
authors.lastname: Ferrando-Castagnetto
authors.affiliation: Centro Cardiovascular Universitario, Hospital de Clínicas, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay.
authors.forename: Alejandro
authors.initials: A
authors.lastname: Vidal
authors.affiliation: Centro Cardiovascular Universitario, Hospital de Clínicas, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay.
authors.forename: Roberto
authors.initials: R
authors.lastname: Ricca-Mallada
authors.affiliation: Centro Cardiovascular Universitario, Hospital de Clínicas, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay.
authors.forename: Romina
authors.initials: R
authors.lastname: Nogara
authors.affiliation: Centro Cardiovascular Universitario, Hospital de Clínicas, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay.
authors.forename: Pablo
authors.initials: P
authors.lastname: Marichal
authors.affiliation: Centro Cardiovascular Universitario, Hospital de Clínicas, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay.
authors.forename: Fabián
authors.initials: F
authors.lastname: Martínez
mesh_terms: D002037:Bundle-Branch Block / Q000175:diagnosis / Q000503:physiopathology*; D005080:Exercise Test; D006801:Humans; D008297:Male; D008875:Middle Aged; D017202:Myocardial Ischemia / Q000503:physiopathology*; D011379:Prognosis; D013599:Systole; D013610:Tachycardia / Q000175:diagnosis / Q000503:physiopathology*; D018487:Ventricular Dysfunction, Left / Q000175:diagnosis / Q000503:physiopathology
keywords: bundle branch block; prognostic; systolic heart failure; tachycardia