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Related Experiment Videos

Enhanced rate response algorithm for orthostatic compensation pacing.

J Mai1, E Park, G A Bornzin

  • 1St. Jude Medical CRMD, 15900 Valley View Ct., Sylmar, CA 91354, USA. jmai2@pacesetter.com

Pacing and Clinical Electrophysiology : PACE
|January 5, 2001
PubMed
Summary
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A new pacemaker algorithm uses accelerometer data to improve heart rate response during orthostatic stress. This enhanced rate response aims to prevent lightheadedness and syncope in pacemaker patients.

Area of Science:

  • Biomedical Engineering
  • Cardiology
  • Physiology

Background:

  • Orthostatic stress normally triggers a heart rate increase to maintain blood pressure.
  • Pacemaker patients may experience inadequate heart rate response to orthostatic stress, leading to symptoms like lightheadedness or syncope.
  • Autonomic dysfunction can exacerbate these issues in some patients.

Purpose of the Study:

  • To develop and evaluate an enhanced rate response algorithm for pacemakers to mitigate adverse effects of orthostatic stress.
  • To utilize accelerometer data to detect transitions from rest to activity, signaling the need for rate adjustment.

Main Methods:

  • An enhanced rate response algorithm was developed, generating activity level (Act) and activity variation (ActVar) signals from an accelerometer.

Related Experiment Videos

  • The algorithm was tested in a taped-on pacemaker on five healthy subjects.
  • Ambulatory electrocardiogram and pacing data were collected over 24 hours.
  • Algorithm triggers were verified against a >10 beats/min heart rate increase, defining an appropriate response.

    • Main Results:

    • The algorithm demonstrated an overall specificity of 78% in detecting appropriate heart rate responses.
    • Nocturnal specificity was significantly higher at 98% compared to daytime specificity of 72%.
    • The algorithm successfully increased pacing rate upon detecting transitions from rest to motion.

    Conclusions:

    • A novel pacing algorithm effectively addresses orthostatic stress by adjusting heart rate based on activity levels.
    • The algorithm shows high specificity, particularly during nighttime hours, suggesting improved patient comfort and reduced inappropriate pacing.
    • This technology holds promise for improving the quality of life for pacemaker patients experiencing orthostatic intolerance.