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Related Experiment Videos

Clinical experience with an activity sensing DDDR pacemaker using an accelerometer sensor.

C P Lau1, Y T Tai, P C Fong

  • 1Department of Medicine, University of Hong Kong, Queen Mary Hospital.

Pacing and Clinical Electrophysiology : PACE
|March 1, 1992
PubMed
Summary
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Accelerometer-based pacemakers offer improved rate stability and response in bradycardia patients. This technology also effectively prevents pacemaker-mediated tachycardia by accurately assessing atrial rates.

Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Medical Devices

Background:

  • Bradycardia, including atrioventricular block and sick sinus syndrome, necessitates pacemaker implantation.
  • Pacemaker-mediated tachycardia (PMT) is a potential complication requiring specific algorithms for prevention.
  • Rate-adaptive pacemakers aim to mimic physiological heart rate responses to activity.

Purpose of the Study:

  • To evaluate the rate-adaptive capabilities of an accelerometer-based DDDR pacemaker.
  • To assess the efficacy of its pacemaker-mediated tachycardia protection algorithm.
  • To compare the accelerometer sensor's performance against a piezoelectric sensor.

Main Methods:

  • Evaluated 11 patients with bradycardia (7 AV block, 4 SSS).
  • Utilized accelerometer sensor for rate-adaptive programming via "tailoring" during moderate exercise.

Related Experiment Videos

  • Compared accelerometer sensor's response to external stimuli (tapping, pressure) with a piezoelectric sensor.

    • Main Results:

    • Accelerometer sensor demonstrated significantly lower rate changes under external tapping and pressure compared to piezoelectric sensor (P < 0.02 and P < 0.001, respectively).
    • At nominal settings, the accelerometer showed improved rate stability and enhanced response to jogging and standing.
    • Programming was optimized with minimal exercise testing due to rate monitoring software capabilities.
    • The system correctly identified and prevented rapid ventricular tracking in two patients with atrial tachyarrhythmias.

    Conclusions:

    • Accelerometer-based DDDR pacemakers provide effective rate-adaptive function and PMT protection.
    • Sensor tailoring and rate monitoring software facilitate efficient and personalized programming.
    • The accelerometer sensor offers superior performance and stability compared to traditional piezoelectric sensors in this context.