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Related Experiment Videos

Improving accelerometer-based rate adaptive pacing by means of second-generation signal processing

M Schmidt1, R Ammer, F Evans

  • 1I. Medizinische Klinik, Klinikum rechts der Isar, Technische Universität München, FRG.

Pacing and Clinical Electrophysiology : PACE
|November 1, 1996
PubMed
Summary

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A new algorithm improves pacemaker rate adaptation by analyzing accelerometer signal morphology, reliably distinguishing uphill and downhill walking for more physiological heart rate control.

Area of Science:

  • Biomedical Engineering
  • Cardiology
  • Signal Processing

Background:

  • Accelerometer-based rate adaptive pacing is widely used in pacemakers.
  • Current systems struggle to differentiate between walking upstairs and downstairs.
  • This limitation affects the physiological accuracy of rate adaptation.

Purpose of the Study:

  • To evaluate a novel signal processing algorithm for enhanced pacemaker rate adaptation.
  • To improve the distinction between ascending and descending locomotion.
  • To achieve more physiological heart rate responses during daily activities.

Main Methods:

  • A custom pacemaker with an accelerometer was used in patients, elderly participants, and students.
  • Participants performed walking exercises on level ground, upstairs, and downstairs at various step rates.

Related Experiment Videos

  • Accelerometer signals were analyzed for frequency, acceleration, and morphology characteristics.

    • Main Results:

    • A new algorithm using the quotient of positive and negative acceleration signal durations reliably discriminated between walking upstairs and downstairs.
    • Correcting the Leaky integrator signal with this quotient improved rate adaptation accuracy.
    • Combining amplitude and morphology criteria enhanced physiological rate adaptation.

    Conclusions:

    • The developed algorithm offers a more accurate and physiological rate adaptation for pacemakers.
    • Distinguishing between ascending and descending locomotion is crucial for optimizing pacemaker function.
    • Utilizing signal morphology alongside amplitude provides superior rate control during varied physical activities.