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Rate-responsive pacing using electrographic parameters as sensors.

D T Connelly1, A F Rickards

  • 1Royal Brompton National Heart and Lung Hospital, London, United Kingdom.

Cardiology Clinics
|November 1, 1992
PubMed
Summary
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This study explores using QT interval and ventricular depolarization gradient for pacemaker rate responsiveness. Dual-sensor pacemakers combining QT and activity sensing show promise for improved patient outcomes.

Area of Science:

  • Biomedical Engineering
  • Cardiology
  • Medical Device Technology

Background:

  • The QT interval has been utilized as a biosensor in pacemakers since 1981.
  • Refinements have enhanced rate response and simplified programming for QT-based pacemakers.
  • Activity sensing has been integrated with QT sensing for dual-sensor pacemakers.

Purpose of the Study:

  • To describe the application of evoked QT-interval and ventricular depolarization gradient as sensors for rate-responsive pacing.
  • To highlight advancements in QT-interval sensing for improved pacemaker function.
  • To introduce dual-sensor and closed-loop pacing systems utilizing these biosensors.

Main Methods:

  • Utilizing the QT interval as a biosensor in implantable pacemakers.

Related Experiment Videos

  • Combining QT and activity sensing for a dual-sensor rate-responsive pacemaker.
  • Incorporating the ventricular depolarization gradient into a closed-loop rate-responsive pacing system.

    • Main Results:

    • Recent refinements have improved rate response characteristics and simplified programming of QT-interval pacemakers.
    • Dual-sensor pacemakers (QT and activity) may offer advantages over single-sensor devices.
    • A closed-loop system using the ventricular depolarization gradient is under clinical evaluation.

    Conclusions:

    • Evoked QT-interval and ventricular depolarization gradient are viable sensors for rate-responsive pacing.
    • Dual-sensor technology represents an advancement in pacemaker functionality.
    • Closed-loop systems with novel biosensors are progressing towards clinical application.