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Lung function tests in bronchial asthma during and after pregnancy.

C D Sims, G V Chamberlain, M de Swiet

    British Journal of Obstetrics and Gynaecology
    |June 1, 1976
    PubMed
    Summary

    Pregnancy impacts asthma differently. Active asthma during pregnancy is linked to impaired respiratory function and smaller babies, while remission shows no significant changes.

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    Area of Science:

    • Pulmonary Medicine
    • Obstetrics & Gynecology
    • Asthma Research

    Background:

    • Asthma is a common chronic respiratory disease.
    • Pregnancy can influence the course of asthma in some individuals.
    • Understanding respiratory function changes during and after pregnancy is crucial for maternal and fetal health.

    Purpose of the Study:

    • To investigate serial changes in respiratory function during pregnancy and postpartum in asthmatic patients.
    • To compare respiratory function between asthmatic patients with active disease and those in remission, as well as with healthy controls.
    • To explore the relationship between asthma activity during pregnancy and infant birth weight.

    Main Methods:

    • Serial pulmonary function tests, including forced vital capacity (FVC) and forced expiratory volume in one second (FEV1), were conducted.
    • Participants included 27 pregnant patients with a history of asthma and 12 healthy control subjects.
    • Asthma activity was categorized based on spirometric evidence of respiratory obstruction during pregnancy.

    Main Results:

    • Asthmatic patients with active disease showed significantly impaired respiratory function tests compared to controls.
    • No significant pregnancy-related changes in respiratory function were observed in either the asthma or control groups.
    • Patients with active asthma during pregnancy tended to deliver smaller babies compared to those in remission or controls.

    Conclusions:

    • Active asthma during pregnancy is associated with measurable respiratory impairment.
    • Pregnancy itself did not appear to cause significant changes in respiratory function in this cohort.
    • Active maternal asthma may be a risk factor for reduced fetal growth, resulting in smaller birth weights.

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