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Related Experiment Videos

Closing volume and pregnancy.

D R Bevan, A Holdcroft, L Loh

    British Medical Journal
    |January 5, 1974
    PubMed
    Summary
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    Airway closure during breathing was measured in pregnant women. Results indicate airway closure occurs more frequently in the erect position, potentially explaining variations in maternal oxygen levels.

    Area of Science:

    • Respiratory Physiology
    • Obstetrics
    • Pulmonary Medicine

    Background:

    • Pregnancy significantly alters maternal respiratory physiology.
    • Understanding changes in lung function during gestation is crucial for maternal and fetal health.
    • Maternal arterial oxygen tension can vary during pregnancy, but underlying mechanisms require elucidation.

    Purpose of the Study:

    • To measure closing volume in pregnant women at term.
    • To investigate the influence of posture (erect vs. supine) on airway closure.
    • To correlate airway closure with functional residual capacity and explain variations in maternal oxygenation.

    Main Methods:

    • Closing volume measurements were performed in 20 women between 36-40 weeks of gestation.
    • Pulmonary function tests were conducted in both erect and supine positions.

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  • The point of airway closure was assessed relative to functional residual capacity.

    • Main Results:

    • Airway closure during tidal breathing was observed in 10 out of 20 women in the erect position.
    • Airway closure occurred in 6 out of 20 women in the supine position.
    • These findings suggest posture-dependent changes in lung volumes and airway dynamics.

    Conclusions:

    • Airway closure during tidal ventilation is prevalent in late pregnancy.
    • Positional changes influence the occurrence of airway closure, with a higher incidence when erect.
    • These respiratory changes may contribute to the observed variability in maternal arterial oxygen tension during pregnancy.