title: Wide QRS complex tachycardia with alternating QRS complexes during cardiac resynchronization therapy: what is the mechanism?
authors.affiliation: Department of Cardiology, Hospital Virgen de la Salud, Toledo, Spain. maapalomares@secardiologia.es
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Arias
authors.forename: Alberto
authors.initials: A
authors.lastname: Puchol
authors.forename: Eduardo
authors.initials: E
authors.lastname: Castellanos
authors.forename: Luis
authors.initials: L
authors.lastname: Rodríguez-Padial
mesh_terms: D058406:Cardiac Resynchronization Therapy; D017147:Defibrillators, Implantable; D004562:Electrocardiography; D006333:Heart Failure / Q000209:etiology / Q000503:physiopathology* / Q000628:therapy; D006801:Humans; D008297:Male; D008875:Middle Aged; D017202:Myocardial Ischemia / Q000150:complications / Q000503:physiopathology* / Q000628:therapy; D017180:Tachycardia, Ventricular / Q000175:diagnosis* / Q000209:etiology / Q000503:physiopathology; D013997:Time Factors