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Related Experiment Videos

Transient early T wave sensing by implanted programmable demand pulse generator.

M Yokoyama, J Wada, S S Barold

    Pacing and Clinical Electrophysiology : PACE
    |January 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

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    A pediatric patient experienced inappropriate pacemaker slowing due to oversensing T waves and afterpotentials. This early post-operative issue resolved within three days, suggesting a transient phenomenon.

    Area of Science:

    • Cardiology
    • Biomedical Engineering
    • Pediatric Electrophysiology

    Background:

    • Permanent epicardial pulse generators are used in pediatric patients.
    • Pacemaker function relies on sensing intrinsic cardiac activity to avoid overpacing.
    • Oversensing can lead to inappropriate inhibition of pacing, causing bradycardia.

    Observation:

    • A seven-year-old girl with an epicardial pulse generator showed inappropriate slowing of pacing rate.
    • This occurred due to oversensing a combination of T wave and afterpotential voltage.
    • The phenomenon was transient, observed only in the first three days post-implantation and at long programmed pulse widths.

    Findings:

    • Early post-operative current of injury may generate significant T wave voltage.

    Related Experiment Videos

  • This T wave voltage, combined with large afterpotentials, can exceed pacemaker sensitivity.
  • Demand pulse generators are susceptible to oversensing these combined signals.

    • Implications:

    • Transient oversensing is a potential complication in early post-operative pacemaker patients.
    • Understanding the electrophysiological basis of oversensing is crucial for device programming.
    • Further research may inform strategies to mitigate this early post-operative phenomenon in pediatric cardiac pacing.