Alternation of right bundle branch block with beats showing normal conduction and with a less complete right bundle branch block pattern.
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.
Vereckei
András
A
Department of Internal Medicine, Semmelweis University, School of Medicine, Budapest, Hungary. vereckei@kut.sote.hu
Tenczer
József
J
Hickman
Michael
M
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