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Respiratory function during pregnancy.

S M Liberatore, R Pistelli, F Patalano

    Respiration; International Review of Thoracic Diseases
    |January 1, 1984
    PubMed
    Summary
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    Pregnant women experience increased alveolar ventilation and respiratory center sensitivity to carbon dioxide during pregnancy, which rapidly decreases postpartum. These changes are likely hormonally driven to support placental gas exchange.

    Area of Science:

    • Physiology
    • Obstetrics
    • Respiratory Medicine

    Background:

    • Pregnancy significantly alters maternal physiology, including respiratory function.
    • Understanding these adaptations is crucial for maternal and fetal health.
    • Previous research suggests changes in ventilation during pregnancy.

    Purpose of the Study:

    • To investigate respiratory mechanics, acid-base balance, and ventilatory response to hypercapnia in pregnant women.
    • To compare these parameters across trimesters and postpartum.
    • To elucidate the underlying mechanisms driving respiratory changes during pregnancy.

    Main Methods:

    • Studied respiratory mechanics, acid-base status, and ventilatory response to hypercapnia.
    • Evaluated parameters in the first and third trimesters of pregnancy and postpartum.

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  • Analyzed changes in alveolar ventilation and respiratory center sensitivity.

    • Main Results:

    • Alveolar hyperventilation and hypersensitivity to carbon dioxide were observed in both trimesters.
    • No significant differences were found between the first and third trimesters.
    • A sudden decrease in these parameters occurred postpartum.

    Conclusions:

    • Respiratory changes during pregnancy are likely due to direct hormonal stimulation of the medulla oblongata.
    • These adaptations favor placental gas exchange, particularly early in pregnancy.
    • The observed changes are not solely correlated with fetal metabolic demands.