title: [Pacemaker ECG quiz: AV sequential pacing--what is happening?].
abstract: The present case of a 55-year-old patient with heart failure displays a complex pacemaker ECG.
authors: Klinik für Innere Medizin--Kardiologie und Angiologie, Ev. Krankenhaus Bielefeld, Burgsteig 13, Bielefeld, Germany. carsten.israel@evkb.de
authors: C W
authors: CW
authors: Israel
mesh_terms: D002304:Cardiac Pacing, Artificial / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000175:diagnosis* / Q000517:prevention & control*; D016896:Treatment Outcome