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Human surface electrogastrograms: ac and dc measurements.

T J Myers, P Bass, J G Webster

    Annals of Biomedical Engineering
    |January 1, 1984
    PubMed
    Summary
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    Abdominal electrical recordings reveal distinct potential differences between the left and right sides of the body in fasted and fed states. These findings inform a new electrical model for the fasted abdominal condition.

    Area of Science:

    • Electrophysiology
    • Human Physiology
    • Biomedical Engineering

    Background:

    • Understanding abdominal electrical activity is crucial for non-invasive physiological monitoring.
    • Previous studies have explored cutaneous electrical potentials, but optimal recording conditions require further investigation.

    Purpose of the Study:

    • To determine optimal conditions for recording abdominal electrical activity using AC and DC methods.
    • To characterize the electrical potential differences across the human abdomen in fasted and fed states.
    • To propose an electrical model explaining observed phenomena.

    Main Methods:

    • Utilized a spatial array of 18 cutaneous biopotential electrodes for AC and DC abdominal recordings.
    • Employed controlled skin puncture and pre-gelled electrodes to minimize artifacts and drift.

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  • Conducted recordings on fasted and fed human subjects over 2-3 hour sessions.
  • Analyzed DC values using a computer for interpolation and generated 2D contour plots.

    • Main Results:

    • Identified an optimal location for AC recording of a 3 cycles per minute (cpm) wave.
    • Observed 7 cpm waves in one subject.
    • Documented a typical pre-feeding potential difference: right abdomen 1.8 mV more negative than the left.
    • Documented a typical post-feeding potential difference: left abdomen 4.6 mV more negative than the right.

    Conclusions:

    • Established optimal parameters for abdominal electrophysiological recordings.
    • Quantified significant shifts in abdominal electrical potential related to feeding status.
    • Proposed a novel electrical model to explain fasted-state abdominal electrical activity.