Concealed right bundle branch block in the presence of type B ventricular pre-excitation.
D002037:Bundle-Branch Block / Q000175:diagnosis* / Q000503:physiopathology; D002648:Child; D003937:Diagnosis, Differential; D004562:Electrocardiography; D006801:Humans; D008297:Male; D014927:Wolff-Parkinson-White Syndrome / Q000175:diagnosis* / Q000503:physiopathology