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Related Experiment Videos

Changes in pacing lead impedance over time predict lead failure

M N Sharif1, D G Wyse, J M Rothschild

  • 1Department of Medicine, University of Calgary, Alberta, Canada.

The American Journal of Cardiology
|September 11, 1998
PubMed
Summary
This summary is machine-generated.

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Monitoring pacing lead impedance can predict lead failure. A decrease in lead impedance over time is a useful indicator for identifying failing pacemaker leads, enhancing patient safety.

Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Medical Device Technology

Background:

  • Pacing lead failure is a significant concern in patients with pacemakers.
  • Previous studies suggested a link between decreased lead impedance and lead failure, but prospective data were limited.
  • Real-time monitoring of lead impedance offers a potential method for early detection of lead malfunction.

Purpose of the Study:

  • To prospectively evaluate the relationship between changes in pacing lead impedance over time and the incidence of lead failure.
  • To assess the predictive value of lead impedance decreases for identifying failing pacemaker leads.
  • To determine the sensitivity and specificity of different impedance decrease thresholds for predicting lead failure.

Main Methods:

  • Prospective monitoring of lead impedance in 105 patients implanted with Medtronic 4012 (n=38) and 4004 (n=67) pacing leads using implantable pulse generators with real-time telemetry.

Related Experiment Videos

  • Documentation of pacing lead failure through serial ambulatory electrocardiographic monitoring and intensified pacemaker clinic surveillance.
  • Statistical analysis to determine sensitivity, specificity, and predictive values of lead impedance changes for lead failure.

    • Main Results:

    • A significant decrease in lead impedance was observed in patients who experienced documented lead failure for both Medtronic 4012 and 4004 leads.
    • Lead impedance remained stable over time in patients without documented lead failure.
    • A lead impedance decrease of ≥15% showed 69% sensitivity and 70% specificity, with a positive predictive value of 54%.
    • A lead impedance decrease of ≥30% demonstrated 36% sensitivity and 90% specificity, with a positive predictive value of 65%.

    Conclusions:

    • Serial measurement of pacing lead impedance is a valuable tool for monitoring pacemaker lead performance.
    • Small decreases in lead impedance can effectively identify potentially failing leads, enabling timely intervention.
    • Prospective monitoring of lead impedance can improve patient outcomes by facilitating early detection of lead issues.