title: Anomalous "VVI" pacing of a dual chamber pacemaker when programmed in DDI(R) mode.
abstract: We describe the case of a dual chamber rate responsive pacemaker (Relay, model 294-03, Intermedics, Angleton, TX, USA) implanted in a 68-year-old male for sick sinus syndrome, which was not working properly when programmed in the DDIR mode, thus determining occasionally a sort of "VVI" pacing. However, the pacemaker performed well when programmed in the DDDR mode. We discovered that this was not a malfunction of a single device but rather a general behavior of this family of Intermedics dual chamber pacemakers (also not rate responsive), caused by a software problem.
authors.affiliation: Cardiology Department, Campo di Marte Hospital, Lucca, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Masini
authors.forename: R
authors.initials: R
authors.lastname: Dianda
authors.forename: L
authors.initials: L
authors.lastname: Cortigiani
authors.forename: E
authors.initials: E
authors.lastname: Nannini
mesh_terms: D000368:Aged; D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D006801:Humans; D008297:Male; D010138:Pacemaker, Artificial / Q000009:adverse effects*; D012804:Sick Sinus Syndrome / Q000503:physiopathology / Q000628:therapy; D012985:Software Design