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Related Experiment Videos

Scoring method for assessing rate adaptive pacemakers: application to two different activity sensors

S Garrigue1, C Chaix, L Gencel

  • 1Hôpital Cardiologique du Haut-Lévêque, Pessac, France.

Pacing and Clinical Electrophysiology : PACE
|April 29, 1998
PubMed
Summary

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A new mathematical method effectively assesses rate adaptive pacemakers (RAPs) during daily activities. Accelerometer-driven pacemakers better mimic healthy heart rate responses compared to vibration-based ones, except during intense exercises like sit-ups.

Area of Science:

  • Biomedical Engineering
  • Cardiology
  • Medical Devices

Background:

  • Rate adaptive pacemakers (RAPs) require optimization for effective programming during daily activities.
  • Assessing pacemaker performance during varied physical exertion is crucial for patient outcomes.

Purpose of the Study:

  • To introduce and validate a novel mathematical method for evaluating RAPs' performance during daily-life tests.
  • To compare the efficacy of accelerometer-controlled versus vibration-controlled RAPs in mimicking physiological heart rate responses.

Main Methods:

  • Developed a Windows-based software utilizing stepwise discriminant analysis and linear regression for pacemaker performance assessment.
  • Evaluated 23 patients with chronic atrial fibrillation and slow ventricular response, randomly assigned to accelerometer (Dash Intermedics) or vibration (Sensolog III Siemens) pacemakers.

Related Experiment Videos

  • Implemented a standardized daily-life test protocol including walking, stair climbing/descending, and sit-ups, comparing patient data to 15 healthy controls.

    • Main Results:

    • The mathematical method quantified pacemaker acceleration and deceleration capacities, generating scores from -10 to +10.
    • The vibration-controlled Sensolog III showed excessive acceleration during stair descent compared to controls and the accelerometer-controlled Dash.
    • Both pacemakers exhibited hypochronotropic responses during sit-ups, with the Sensolog III showing a more pronounced difference.

    Conclusions:

    • The developed mathematical analysis provides a simple, reproducible method for evaluating sensor-driven pacemakers.
    • Accelerometer-driven pacemakers demonstrated heart rate responses closer to healthy individuals during general daily activities.
    • Activity-driven pacemakers effectively accommodate brief activities but struggle with isovolumetric exercises like sit-ups.