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Related Experiment Videos

Pulmonary function studies in healthy Pakistani adults.

D E Williams, R D Miller, W F Taylor

    Thorax
    |April 1, 1978
    PubMed
    Summary

    Spirometry values show significant geographical and ethnic variations. Maximal mid-expiratory flow (MMF) is a more sensitive indicator of subtle pulmonary changes in smokers than FVC or FEV1.

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    Area of Science:

    • Pulmonary Medicine
    • Epidemiology
    • Respiratory Physiology

    Background:

    • Predicted normal spirometric values exhibit significant geographical and ethnic variations.
    • These variations are crucial for epidemiological disease prevalence studies and clinical assessment of pulmonary function.
    • Understanding these differences is vital for accurate interpretation of lung function tests.

    Purpose of the Study:

    • To assess geographical and ethnic variations in predicted normal spirometric values in a Pakistani population.
    • To compare spirometric values between Pakistani men and women, and with other populations.
    • To evaluate the impact of smoking on spirometric parameters and compare the sensitivity of different measures.

    Main Methods:

    • Spirometry was performed on 599 men and 94 women in Pakistan.
    • Forced Vital Capacity (FVC), Forced Expiratory Volume in one second (FEV1), and Maximal Mid-expiratory Flow (MMF, or FEF25-75%) were measured.
    • Data were analyzed to compare values across geographical regions, ethnicities, and smoking status.

    Main Results:

    • Pakistani men's FVC and FEV1 were similar to emigrant Pakistanis and North-West Indians, but higher than South/East Indians.
    • Pakistani women's values were comparable to Northern Indian women.
    • While FVC and FEV1 did not differ between smokers and non-smokers, MMF (FEF25-75%) showed a significant difference, indicating greater sensitivity to smoking effects.

    Conclusions:

    • Spirometric values in Pakistan show regional and ethnic variations.
    • Maximal Mid-expiratory Flow (MMF) is a more sensitive indicator of subtle, asymptomatic pulmonary changes in smokers compared to FVC and FEV1.
    • These findings underscore the importance of population-specific reference values for spirometry.

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