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Head ballistocardiogram based on wireless multi-location sensors.

Kohei Onizuka, Charles G Sodini

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
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    A new wireless monitor uses ear-worn accelerometers to capture ballistocardiography (BCG) signals. This wearable technology correlates head movements to stroke volume, enabling easier vital signs monitoring.

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    Area of Science:

    • Biomedical Engineering
    • Cardiovascular Physiology
    • Wearable Technology

    Background:

    • Conventional ballistocardiography (BCG) acquisition systems are bulky.
    • Wearable accelerometers offer a potential alternative for BCG monitoring.
    • Vital signs monitoring needs more accessible and portable solutions.

    Purpose of the Study:

    • To develop a multi-location wireless vital signs monitor.
    • To identify acceleration vectors correlating to sitting-BCG in the supine position.
    • To establish a relationship between head-side BCG amplitude and stroke volume.

    Main Methods:

    • Developed a multi-location wireless vital signs monitor.
    • Utilized head-worn accelerometers for BCG signal acquisition.
    • Employed photoplethysmography (PPG) signals from the head as a reference.
    • Analyzed data from eight healthy human subjects in supine and sitting positions.
    • Developed signal processing techniques for identifying J-waves.

    Main Results:

    • Identified two common acceleration vectors correlating to sitting-BCG in the supine position.
    • Found head-side BCG amplitude in the supine position is proportional to sitting amplitude.
    • Demonstrated that BCG amplitude correlates with stroke volume.
    • Developed methods to identify low-amplitude J-waves using head-side vectors.

    Conclusions:

    • A wearable, multi-location wireless vital signs monitor can effectively capture BCG signals.
    • Head-side acceleration vectors in the supine position correlate with sitting BCG and stroke volume.
    • This technology offers a promising, non-invasive approach for cardiovascular monitoring.