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Voluntary changes in ventilation distribution in the lateral posture.

J C Chevrolet, J Emrich, R R Martin

    Respiration Physiology
    |December 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

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    Voluntary changes in breathing patterns alter lung ventilation distribution in the lateral posture. Relaxing the diaphragm directs airflow to the non-dependent lung, while diaphragm contraction favors the dependent lung.

    Area of Science:

    • Pulmonary Physiology
    • Respiratory Mechanics

    Background:

    • The lateral decubitus posture can alter ventilation distribution.
    • Understanding how inspiratory muscle activity influences this distribution is crucial for respiratory management.

    Purpose of the Study:

    • To investigate the effect of voluntary changes in inspiratory muscle contraction patterns on ventilation distribution in the lateral decubitus posture during tidal breathing.

    Main Methods:

    • Four healthy subjects breathed naturally (N), with intercostal/accessory muscles (IC), or with enhanced diaphragmatic/abdominal motion (Ab).
    • Nitrogen (N2) and Xenon-133 (133Xe) washouts were measured at the mouth, with regional lung ventilation assessed using external scintillation detectors.

    Main Results:

    • During natural and Ab breathing, ventilation was preferentially distributed to dependent lung regions (0.55 ± 0.05 and 0.42 ± 0.02 of non-dependent regions, respectively).

    Related Experiment Videos

  • During IC breathing, ventilation was more evenly distributed between non-dependent and dependent lung regions (0.99 ± 0.17 ratio).
  • N2 washout curves during IC breathing approached monoexponentiality, but no significant differences in breathing patterns were found via two-compartment analysis.

    • Conclusions:

    • Voluntary relaxation of the diaphragm in the lateral posture leads to preferential ventilation of non-dependent lung regions.
    • Diaphragmatic contraction during natural and Ab breathing promotes preferential ventilation of dependent lung regions.