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Related Experiment Videos

A new motion responsive pacemaker: first clinical experience with an acceleration sensor pacemaker.

U Borst1, G Siekmeyer, B Maisch

  • 1Division of Cardiology, University of Marburg, Germany.

Pacing and Clinical Electrophysiology : PACE
|November 1, 1992
PubMed
Summary
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The EXCEL VR accelerometer pacemaker accurately adjusts heart rate during exercise and position changes. Its sensor-mediated rate closely mimics physiological responses, showing high correlation with intrinsic heart rate.

Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Medical Devices

Background:

  • Pacemakers are crucial for managing bradycardia.
  • Adaptive rate pacemakers aim to optimize heart rate response to physical activity.
  • The EXCEL VR pacemaker utilizes an accelerometer for rate adaptation.

Purpose of the Study:

  • To evaluate the performance of the EXCEL VR accelerometer-based adaptive rate pacemaker at nominal settings.
  • To assess its response to treadmill exercise and postural changes in patients with sinus rhythm.

Main Methods:

  • Eight patients in sinus rhythm were enrolled.
  • Intrinsic heart rate was compared to sensor-mediated pacing rate.
  • Patients underwent treadmill exercise testing and postural changes.

Related Experiment Videos

  • Correlation analysis (Pearson product moment) was performed.

    • Main Results:

    • Sensor-mediated rate closely paralleled physiological changes during exercise (r = 0.82, P = 0.001).
    • Postural changes elicited immediate and appropriate sensor rate adjustments.
    • Pacing rates varied appropriately with activity levels: 62.4 bpm (supine) to 96.8 bpm (fast walking).
    • Recovery pacing rate dropped to 65 bpm within 4 minutes.

    Conclusions:

    • The accelerometer sensor and pulse generator algorithm demonstrated accurate, physiological-like heart rate modulation.
    • The device performed well at nominal settings with minimal need for programming adjustments.
    • The EXCEL VR pacemaker effectively mimics intrinsic heart rate responses during daily activities and exercise.