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Related Experiment Videos

Pulmonary distensibility and ventilatory function in smokers.

H J Colebatch, I A Greaves, C K Ng

    Bulletin Europeen De Physiopathologie Respiratoire
    |September 1, 1985
    PubMed
    Summary

    Cigarette smokers show increased pulmonary distensibility, an early sign of emphysema, even without airway obstruction. This suggests early airspace enlargement in asymptomatic smokers due to cigarette smoke exposure.

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    Area of Science:

    • Pulmonary Medicine
    • Respiratory Physiology
    • Emphysema Research

    Background:

    • Emphysema is characterized by enlarged airspaces in the lungs.
    • Early detection of lung changes in smokers is crucial for intervention.
    • Pulmonary distensibility is a key indicator of lung elasticity.

    Purpose of the Study:

    • To quantify the increase in pulmonary distensibility in smokers before emphysema develops.
    • To investigate the relationship between age, smoking, and lung distensibility.
    • To determine if increased distensibility occurs in asymptomatic smokers.

    Main Methods:

    • Studied 101 cigarette-smoking volunteers (18-60 years old).
    • Measured pulmonary distensibility using the exponent K from static pressure-volume curves.
    • Assessed lung function parameters including Total Lung Capacity (TLC), Vital Capacity (VC), FEV1, and mid-expiratory flow.

    Main Results:

    • Smokers exhibited increased pulmonary distensibility (exponent K) compared to non-smokers.
    • Increased distensibility (K) correlated with age in smokers.
    • Total Lung Capacity (TLC) was elevated in male smokers, correlating with increased distensibility (K).
    • These changes were observed in smokers without significant airway obstruction.

    Conclusions:

    • Increased pulmonary distensibility is an early indicator of lung changes in smokers, preceding emphysema development.
    • Cigarette smoke appears to cause airspace enlargement in asymptomatic smokers.
    • Pulmonary distensibility (K) serves as a marker for early, subclinical emphysematous changes.

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