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Ventilation-perfusion inequality in chronic asthma.

P D Wagner, G Hedenstierna, G Bylin

    The American Review of Respiratory Disease
    |September 1, 1987
    PubMed
    Summary

    Ventilation-perfusion (VA/Q) inequality is common in stable asthma, with blood flow distribution significantly impaired. This inequality, measured using inert gas elimination, varied over time and between individuals, impacting arterial oxygen levels.

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    Area of Science:

    • Pulmonary Physiology
    • Respiratory Medicine

    Background:

    • Ventilation-perfusion (VA/Q) inequality is a known contributor to hypoxemia in asthma.
    • Assessing serial changes in VA/Q inequality in stable asthmatics is crucial for understanding disease variability.

    Purpose of the Study:

    • To investigate the prevalence and week-to-week variability of VA/Q inequality in stable, symptomatic asthmatic subjects.
    • To correlate VA/Q inequality with arterial oxygenation in this cohort.

    Main Methods:

    • Utilized a modified multiple inert gas elimination technique for serial VA/Q measurements without arterial blood sampling.
    • Quantified VA/Q inequality using log standard deviation (log SD) of blood flow (log SDQ) and ventilation (log SDV) distributions.
    • Analyzed variance to determine contributions of intersubject differences, temporal changes, and experimental error to VA/Q variability.

    Main Results:

    • All 26 asthmatic subjects exhibited abnormal log SDQ (exceeding normal limits) in at least 2 weeks of the 9-week study.
    • Bimodal blood flow distributions (indicating low VA/Q units) were observed in 24 subjects, though inconsistently.
    • Arterial PO2 was inversely related to log SDQ (r = 0.76), but VA/Q mismatch explained only 60% of PaO2 variance.

    Conclusions:

    • Significant and persistent VA/Q inequality, particularly in blood flow distribution, is characteristic of stable asthma.
    • VA/Q inequality exhibits considerable intersubject variability and some random fluctuation over time.
    • While VA/Q mismatch impacts arterial oxygenation, other extrapulmonary factors also influence PaO2 in asthmatic patients.

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