title: Acute transient non-physiological over-sensing in the ventricle with a DF4 lead.
abstract: The DF-4 is a new defibrillator lead technology. We present two cases of non-physiological transient ventricular over-sensing in patients who underwent implantation of an ICD for secondary prevention. Case 1 had ventricular over-sensing during pacing threshold evaluation post defibrillation testing while Case 2 had the lead integrity alert triggered immediately post discharge with transient over-sensing. No lead-connector issues were found. Case 1 was likely due to improper venting of the header and trapped air. Case 2 was hypothesized to be due to intermittent header pin non-contact secondary to blood in the header. These cases reveal that DF-4 leads are subject to both reported and potentially novel causes of transient acute ventricular over-sensing.
authors.affiliation: Princess Alexandra Hospital, Department of Cardiology, Queensland, Australia.
authors.forename: Kevin Kit
authors.initials: KK
authors.lastname: Ng
authors.affiliation: Princess Alexandra Hospital, Department of Cardiology, University of Queensland, Department of Medicine, Brisbane, Australia.
authors.forename: Paul A
authors.initials: PA
authors.lastname: Gould
keywords: DF-4 lead; Implantable cardioverter defibrillator; Over-sensing