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Related Experiment Videos

Muscle noise and interference behavior in pacemakers: a comparative study.

W Irnich

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

    Pacemaker inhibition by muscle noise is a growing concern, especially with sensitive dual-chamber devices. Many pacemakers are vulnerable to muscle noise interference, requiring improved resistance strategies.

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    Area of Science:

    • Biomedical Engineering
    • Cardiology
    • Medical Device Technology

    Background:

    • Muscle noise interference in VVI pacemakers has been known since 1972.
    • Increased sensitivity in modern dual-chamber atrial synchronized pacemakers heightens susceptibility to electromagnetic interference.
    • There is a continuous effort to improve pacemaker resistance to various forms of interference.

    Purpose of the Study:

    • To evaluate the susceptibility of 16 pacemakers from 10 manufacturers to muscle noise.
    • To determine the muscle noise thresholds for these pacemakers.
    • To compare pacemaker response to muscle noise versus intracardiac electrographic signals.

    Main Methods:

    • A 16-second loop of muscle noise was used to test 16 pacemakers.
    • The amplitude of the muscle noise signal was varied to identify the response threshold for each pacemaker.
    • Filtering techniques, including a 12 dB filter with variable upper cut-off frequency, were applied to muscle noise, 50-Hz signals, and intracardiac electrograms.

    Main Results:

    • Pacemaker muscle noise thresholds varied significantly, ranging from 0.4 mV to 4.6 mV.
    • Only 4 out of 16 pacemakers were unaffected by a 3 mV muscle noise signal.
    • In 11 pacemakers, the muscle noise threshold was lower than that for intracardiac signals, suggesting a noise-induced sensitization mechanism.
    • Five pacemakers remained sensitive to muscle noise even at a 4 mV setting.
    • Filtering analysis showed that heart signals were consistently attenuated more than interference signals.

    Conclusions:

    • A significant number of pacemakers exhibit low thresholds for muscle noise interference.
    • Modern pacemakers, particularly dual-chamber devices, require enhanced resistance to muscle noise.
    • Noise-induced sensitization can lower the interference threshold, necessitating careful pacemaker selection and programming.

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