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Related Experiment Videos

Irreversible airflow obstruction. Evolution in asthma.

K E Finucane, H W Greville, P J Brown

    The Medical Journal of Australia
    |May 27, 1985
    PubMed
    Summary
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    Chronic asthma can lead to irreversible airflow obstruction (IAO) due to narrowed airways. Early and improved asthma control may prevent this serious complication.

    Area of Science:

    • Pulmonology
    • Respiratory Medicine
    • Clinical Investigation

    Background:

    • Asthma is a chronic respiratory disease characterized by airway inflammation.
    • The potential for asthma to cause irreversible airflow obstruction (IAO) remains a significant clinical concern.

    Purpose of the Study:

    • To investigate if uncomplicated asthma can lead to irreversible airflow obstruction (IAO).
    • To assess the relationship between asthma duration, severity, and physiological markers of airway obstruction.

    Main Methods:

    • 89 subjects with uncomplicated asthma underwent four weeks of intensive treatment.
    • Forced expiratory volume in 1 second (FEV1) was measured at baseline and at two and four weeks.
    • Pulmonary elasticity and flow resistance were assessed in a subset of subjects.

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    Main Results:

    • A significant improvement in FEV1 was observed after intensive treatment (mean difference 0.29 L, P < 0.001).
    • Higher FEV1% predicted correlated significantly with shorter asthma duration and lower severity (P < 0.001).
    • Pulmonary resistance, not elastic recoil, correlated with asthma duration and severity (P < 0.01).

    Conclusions:

    • Chronic asthma can cause airway narrowing and irreversible airflow obstruction (IAO).
    • These findings suggest that improved asthma control may be crucial in preventing IAO.