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Related Experiment Videos

Rate-responsive pacing based on sympathetic activity

H Hutten1, M Schaldach

  • 1Institut für Elektro- und Biomedizinische Technik, Technische Universität, Graz, Austria.

Medical & Biological Engineering & Computing
|July 1, 1993
PubMed
Summary
This summary is machine-generated.

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Modern pacemakers can now adapt pacing rates to the body's needs by monitoring the autonomic nervous system (ANS). This study shows ANS-controlled pacing closely matches natural heart rhythms during exercise, improving hemodynamic function.

Area of Science:

  • Biomedical Engineering
  • Cardiology
  • Physiology

Background:

  • Modern pacemakers aim to mimic physiological heart function.
  • Restoring a closed-loop system using autonomic nervous system (ANS) signals is a key goal.
  • Myocardial contractile performance offers valuable physiological data.

Purpose of the Study:

  • To develop and evaluate a novel pacemaker system for rate adaptation based on ANS activity.
  • To assess the physiological closed-loop system's efficacy in matching pacing to hemodynamic demands.
  • To validate the use of impedance measurements for ANS-dependent parameter detection.

Main Methods:

  • Utilized the impedance method with stimulation electrodes for measurement.
  • Identified and measured the ventricular inotropic parameter (VIP) as an ANS-dependent indicator.

Related Experiment Videos

  • Developed a sensitive detection algorithm (RQ - regional effective slope quantity) and an inotropic index (II) for rate control.
  • Conducted a multicenter study with a standardized exercise protocol in patients with AV block.

    • Main Results:

    • Demonstrated excellent agreement between spontaneous sinus rhythm and ANS-controlled pacing rates during various exercises in AV block patients.
    • The ventricular inotropic parameter (VIP) proved to be ANS-dependent.
    • The RQ algorithm showed high ANS sensitivity.
    • Mean arterial blood pressure (MABP) measurements supported the physiological approach.

    Conclusions:

    • The developed ANS-controlled pacing system effectively adapts pacing rates to hemodynamic requirements.
    • This technology shows promise for restoring physiological closed-loop pacing.
    • Impedance-based monitoring and specific algorithms offer a viable method for advanced pacemaker rate adaptation.