title: Spike on T wave! What went wrong?
abstract: An 80-year-old male, who previously received a dual chamber pacemaker, was referred to our ambulatory for dizziness and fatigue. The ECG obtained showed sinus rhythm, highly variable atrioventricular (AV) interval and alternation between spontaneous and paced ventricular complexes. A spike on the ascending part of the T wave was observed, suggesting ventricular undersensing. However, telemetry-supported pacemaker control showed inconstant atrial undersensing.
authors.affiliation: Cardiology Unit, Department of Clinical and Experimental Medicine, University Hospital of Messina, Messina, Italy. Electronic address: pasqualecrea@hotmail.it.
authors.forename: Pasquale
authors.initials: P
authors.lastname: Crea
authors.affiliation: Cardiology Unit, Department of Clinical and Experimental Medicine, University Hospital of Messina, Messina, Italy.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Picciolo
authors.affiliation: Internal Medicine Unit, University Hospital of Messina, Messina, Italy.
authors.forename: Teresa
authors.initials: T
authors.lastname: Crea
authors.affiliation: Cardiology Unit, Department of Clinical and Experimental Medicine, University Hospital of Messina, Messina, Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: Luzza
mesh_terms: D000369:Aged, 80 and over; D054537:Atrioventricular Block / Q000150:complications / Q000175:diagnosis* / Q000517:prevention & control*; D002304:Cardiac Pacing, Artificial; D004244:Dizziness / Q000150:complications / Q000175:diagnosis*; D004562:Electrocardiography / Q000379:methods*; D004868:Equipment Failure; D005221:Fatigue / Q000150:complications / Q000175:diagnosis*; D006801:Humans; D008297:Male
keywords: Atrial undersensing; Dual chamber device; R on T; Ventricular undersensing