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Large airways function during normal pregnancy

J A Milne, R J Mills, A D Howie

    British Journal of Obstetrics and Gynaecology
    |June 1, 1977
    PubMed
    Summary
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    Pregnancy does not alter lung function in the larger airways. Studies show specific airways conductance and forced expiratory volume in one second remain unchanged throughout pregnancy and postpartum.

    Area of Science:

    • Pulmonary Physiology
    • Obstetrics and Gynecology

    Background:

    • Respiratory function can change during pregnancy due to physiological adaptations.
    • Understanding airway function in pregnant individuals is crucial for maternal and fetal health.

    Purpose of the Study:

    • To investigate the impact of normal pregnancy on the function of larger pulmonary airways.
    • To assess changes in specific airways conductance and forced expiratory volume in one second during and after pregnancy.

    Main Methods:

    • Monthly measurements of specific airways conductance and forced expiratory volume in one second.
    • Study included 30 subjects during normal pregnancy, from the first trimester to term.
    • Postpartum measurements were also conducted for comparison.

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    Main Results:

    • No significant changes were observed in specific airways conductance throughout pregnancy.
    • Forced expiratory volume in one second remained stable during the entire pregnancy period.
    • Pulmonary function measurements showed no significant difference when compared to postpartum values.

    Conclusions:

    • Normal pregnancy does not appear to significantly alter the function of the larger pulmonary airways.
    • Specific airways conductance and forced expiratory volume in one second are reliable indicators of airway function during pregnancy.
    • These findings suggest that major airway physiology remains largely unaffected by the pregnant state.