Document Detail

Artifacts recorded through failing bipolar polyurethane insulated permanent pacing leads.
MedLine Citation:
PMID:  11225597     Owner:  NLM     Status:  MEDLINE    
Pacing failure in bipolar systems using polyurethane insulated leads may be frequent depending on the type of polyurethane and can cause oversensing and or failure to capture. The reason for this failure is often breakage in the inner insulation. The aim of this study was to evaluate the signals created by such a short circuit. Thirty-seven patients were included in the study, 13 with failing leads with polyurethane 80A insulation, 14 with old but normally functioning leads and 10 patients with new leads. Artifacts in the form of spikes were recorded, during surgical revision, from 11 patients with failing leads (84.6%). In patients with normally functioning leads and newly implanted leads no artifacts were recorded. A significant decrease in impedance of 373.4 Ohms (99% confidence intervals 286.4-460.4, P<0.05) was noted in the failing leads compared with a decrease of only 113.0 Ohms (99%, confidence intervals 6.5-219.6, P<0.01) in the control leads. The difference between the groups was highly significant. In 10 newly implanted and five normally functioning bipolar ventricular leads similar artifacts could be created by making intermittent contact between the proximal lead connections. Thus, artifacts could be recorded from failing leads and from intact leads with artificial intermittent connection at the proximal end. Our results suggest that the failure is caused by a short circuit in the lead. This finding may have important clinical applications in the follow-up of bipolar pacing and defibrillation leads.
S Rosenheck; Z Sharon; D Leibowitz
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Publication Detail:
Type:  Comparative Study; Evaluation Studies; Journal Article    
Journal Detail:
Title:  Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology     Volume:  2     ISSN:  1099-5129     ISO Abbreviation:  Europace     Publication Date:  2000 Jan 
Date Detail:
Created Date:  2001-02-27     Completed Date:  2001-03-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100883649     Medline TA:  Europace     Country:  England    
Other Details:
Languages:  eng     Pagination:  60-5     Citation Subset:  IM    
Department of Medicine, Hadassah University Hospital, Mount Scopus, Jerusalem, Israel.
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MeSH Terms
Coated Materials, Biocompatible*
Device Removal
Electrodes, Implanted*
Equipment Failure
Heart Block / physiopathology,  therapy*
Heart Ventricles / physiopathology
Pacemaker, Artificial*
Reg. No./Substance:
0/Coated Materials, Biocompatible; 0/Polyurethanes

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