Han, SeongwookMiller, John M.Das, Mithilesh Kumar2025-04-012025-04-012014Han S, Miller JM, Das MK. Supraventricular tachycardia and sinus rhythm with contralateral bundle branch block patterns. Korean Circ J. 2014;44(4):271-273. doi:10.4070/kcj.2014.44.4.271https://hdl.handle.net/1805/46732A contralateral bundle branch block (BBB) aberration during tachycardia with a preexisting BBB strongly suggests the presence of ventricular tachycardia. We report on a middle-aged, female patient presented with wide QRS tachycardia. The patient had orthodromic atrioventricular tachycardia with a left BBB aberration in the presence of a preexisting right BBB due to an abnormal His-Purkinje system. We learned that the contralateral BBB aberration with supraventricular tachycardia could be seen when the His-Purkinje system was abnormal.en-USAttribution-NonCommercial 4.0 InternationalBundle-branch blockTachycardiaSupraventricularBundle of HisPurkinje fibersArticle