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Related Experiment Videos

Right ventricular blood temperature profiles for rate responsive pacing.

T D Sellers, N E Fearnot, H J Smith

    Pacing and Clinical Electrophysiology : PACE
    |May 1, 1987
    PubMed
    Summary

    A novel pacemaker algorithm uses body temperature to adjust heart rate. Right ventricular temperature changes predictably with daily activities, enabling the algorithm to differentiate between rest and exercise.

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    Area of Science:

    • Biomedical Engineering
    • Cardiology
    • Physiology

    Background:

    • Pacemaker technology aims to optimize heart rate regulation.
    • Understanding physiological responses to daily activities is crucial for advanced pacing.
    • Body temperature fluctuations are linked to metabolic and circulatory changes.

    Purpose of the Study:

    • To evaluate a temperature-based pacemaker control algorithm's efficacy.
    • To investigate right ventricular temperature variations during diverse daily activities.
    • To determine if temperature changes can reliably indicate rest versus exercise states.

    Main Methods:

    • Measured right ventricular temperature and heart rate in eight patients and one volunteer.
    • Data collection spanned 12-70 hours, encompassing activities like exercise, rest, eating, drinking, and bathing.

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  • Utilized treadmill exercise protocols (Bruce and Naughton) to assess responses.

    • Main Results:

    • Observed diurnal variations in heart rate and temperature.
    • Drinking caused transient temperature changes; eating led to moderate increases.
    • Exercise induced an initial temperature drop, followed by a steady rise, with predictable patterns observed.

    Conclusions:

    • Right ventricular temperature exhibits predictable changes correlating with daily activities.
    • These temperature variations can be reliably detected by an algorithm.
    • A temperature-based algorithm shows potential for accurately distinguishing between rest and exercise for pacemaker control.