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[Transthoracic electrical impedance (author's transl)]

C Stick

    European Journal of Applied Physiology and Occupational Physiology
    |January 1, 1981
    PubMed
    Summary

    Transthoracic impedance measurements for tidal volume and fluid volume are affected by breathing and body position. Accurate intrathoracic fluid volume determination requires stable conditions, while stroke volume research using impedance cardiography is ongoing.

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    Area of Science:

    • Biomedical Engineering
    • Physiology

    Context:

    • Transthoracic impedance measurement is utilized for assessing tidal volume and intrathoracic fluid volume.
    • Clinical diagnostics increasingly employ impedance methods.
    • Cardiac stroke volume calculation from impedance changes is a common claim.

    Purpose:

    • Investigate the theoretical basis of transthoracic impedance measurements.
    • Quantify the impact of measurement errors on obtained results.
    • Analyze the influence of breathing and body position on impedance determination.

    Summary:

    • Phase angle measurements indicate negligible errors when using impedance over resistance.
    • Breathing and body position significantly influence impedance determination.
    • Accurate intrathoracic fluid volume measurement necessitates fixed electrode placement, stable body position, and elimination of respiratory effects.
    • Respiratory movements are detectable, but the impact of baseline impedance changes on stroke volume via impedance cardiography remains under-researched.

    Impact:

    • Highlights the limitations of transthoracic impedance for precise fluid volume assessment.
    • Underscores the need for controlled conditions in impedance-based physiological monitoring.
    • Identifies areas requiring further research, particularly concerning stroke volume determination using impedance cardiography.

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