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Related Experiment Videos

Initial experience with an autocapture pacemaker system.

R M Kam1, C S Tan, W S Teo

  • 1Department of Cardiology, National Heart Centre, Singapore, Mistri Wing, 17 Third Hospital Avenue, Singapore 168752. Ruth_KAM@nhc.com.sg

Annals of the Academy of Medicine, Singapore
|March 29, 2001
PubMed
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Autocapture management in pacemakers requires a sufficient Evoked Response (ER) signal for successful activation. This study found that ER signal testing is crucial for enabling autocapture, impacting pacemaker longevity and patient safety.

Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Medical Devices

Background:

  • Autocapture management in pacemakers aims to enhance device longevity and patient safety.
  • It achieves this by automatically monitoring pacing thresholds and adjusting pacemaker output for consistent capture.
  • This study evaluates the initial experience with the Pacesetter Regency pacemaker featuring autocapture management.

Purpose of the Study:

  • To assess the feasibility and initial outcomes of implementing autocapture management in single-chamber pacemakers.
  • To determine the success rate of programming autocapture 'ON' based on Evoked Response (ER) signal amplitude.
  • To identify factors that may preclude the successful activation of autocapture management.

Main Methods:

  • Nineteen patients received single-chamber pacemakers with autocapture management.

Related Experiment Videos

  • Autocapture was programmed 'ON' post-implantation if the Evoked Response (ER) amplitude was ≥ 2.8 mV.
  • Patients were followed up at 2 weeks, 2 months, and 6 months, with pacing threshold and lead impedance measurements.

    • Main Results:

    • Autocapture was successfully enabled in 16 out of 19 patients on the day after implantation.
    • One patient had an insufficient ER signal (< 2.8 mV).
    • Two patients in rapid atrial fibrillation (>120 bpm) could not have ER signal testing, precluding autocapture activation.

    Conclusions:

    • Successful autocapture management relies on achieving an Evoked Response (ER) signal of at least 2.8 mV.
    • Intraoperative testing of the ER signal is essential for realizing autocapture benefits.
    • Current pacing system analyzers lack the capability to measure ER signals, necessitating procedural modifications and potentially longer implantation times.