title: Validation of defibrillator lead performance registry data: insight from the Danish Pacemaker and ICD Register.
abstract: OBJECTIVE
  The validity of registry data on defibrillator lead performance is described only sparsely, despite its clinical importance. This study investigated the validity of defibrillator lead performance registry data in a nationwide and population-based registry.
  
  
  RESULTS
  We identified all reported surgical interventions due to defibrillator lead events in the Danish Pacemaker and ICD Register (DPIR) from 2000 to 2013. Medical records of all patients (n = 753) were examined blinded for 5 predefined intervention types and 18 reasons for lead intervention. The overall level of agreement for the types of lead intervention had a positive predictive value (PPV) of 89.4% [95% confidence interval (CI): 87.0-91.5%] and an adjusted agreement (κ value) of 0.81 (95% CI: 0.77-0.85) representing an almost perfect match. Regarding the reasons for lead intervention, the overall PPV was 63.0% (95% CI: 54.8-61.7%) with a κ value of 0.60 (95% CI: 0.55-0.64) representing a moderate match with only few subcategories having low PPV. By redistribution of the specific reasons for lead interventions into three categories commonly used to report lead performance, the overall PPV improved to 87.9% (95% CI: 85.2-90.2%) with a κ value of 0.82 (95% CI:0.78-0.86) representing an almost perfect match.
  
  
  CONCLUSIONS
  The validity of data on defibrillator lead performance recorded in the DPIR is excellent for the specific types of lead intervention and good for the specific reasons for defibrillator lead intervention. The validity of the less detailed overall reasons for lead interventions commonly used to report lead performance is also excellent. These findings indicate high registry data quality appropriate for scientific analysis and industry-independent post-marketing surveillance.
authors.affiliation: Department of Cardiology, Aalborg University Hospital, Aalborg, Denmark.
authors.forename: Anders Elgaard
authors.initials: AE
authors.lastname: Kristensen
authors.affiliation: Department of Cardiology, Aalborg University Hospital, Aalborg, Denmark.
authors.forename: Jacob Moesgaard
authors.initials: JM
authors.lastname: Larsen
authors.affiliation: Department of Cardiology, Aarhus University Hospital, Aarhus C, Denmark.
authors.forename: Jens Cosedis
authors.initials: JC
authors.lastname: Nielsen
authors.affiliation: Department of Cardiology, Odense University Hospital, Odense C, Denmark.
authors.forename: Jens Brock
authors.initials: JB
authors.lastname: Johansen
authors.affiliation: Department of Cardiology, Gentofte Hospital, Hellerup, Denmark.
authors.forename: Jens
authors.initials: J
authors.lastname: Haarbo
authors.affiliation: The Heart Centre, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark.
authors.forename: Helen Høgh
authors.initials: HH
authors.lastname: Petersen
authors.affiliation: Department of Cardiology, Aalborg University Hospital, Aalborg, Denmark.
authors.forename: Sam
authors.initials: S
authors.lastname: Riahi
mesh_terms: D000368:Aged; D001145:Arrhythmias, Cardiac / Q000150:complications / Q000175:diagnosis / Q000401:mortality / Q000628:therapy*; D000068598:Data Accuracy; D016757:Death, Sudden, Cardiac / Q000209:etiology / Q000517:prevention & control*; D017147:Defibrillators, Implantable / Q000592:standards*; D003718:Denmark; D004554:Electric Countershock / Q000009:adverse effects / Q000295:instrumentation* / Q000592:standards*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012042:Registries / Q000592:standards*; D015203:Reproducibility of Results; D013997:Time Factors; D016896:Treatment Outcome
keywords: ICD; Implantable cardioverter defibrillators; Registry data; Validation