title: Alternation of right bundle branch block with beats showing normal conduction and with a less complete right bundle branch block pattern.
abstract: We report the case of an 80-year-old man with a preexistent right bundle branch block (RBBB) who underwent dobutamine stress echocardiography. As the sinus cycle length gradually decreased during the stress test, he first developed a 2:1 RBBB pattern alternating with beats showing normal conduction and then an alternating 2:1 less complete and more complete RBBB pattern. An elucidation of the potential mechanism of the latter very rare phenomenon is provided.
authors.affiliation: Department of Internal Medicine, Semmelweis University, School of Medicine, Budapest, Hungary. vereckei@kut.sote.hu
authors.forename: András
authors.initials: A
authors.lastname: Vereckei
authors.forename: József
authors.initials: J
authors.lastname: Tenczer
authors.forename: Michael
authors.initials: M
authors.lastname: Hickman
mesh_terms: D000369:Aged, 80 and over; D002037:Bundle-Branch Block / Q000175:diagnosis*; D003937:Diagnosis, Differential; D004562:Electrocardiography / Q000379:methods*; D006801:Humans; D008297:Male; D017180:Tachycardia, Ventricular / Q000175:diagnosis