title: Wide and narrow QRS-complex tachycardias occurring in the same patient.
mesh_terms: D000328:Adult; D002037:Bundle-Branch Block / Q000150:complications / Q000175:diagnosis*; D004562:Electrocardiography; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008297:Male; D013610:Tachycardia / Q000150:complications / Q000175:diagnosis*