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Pulmonary diffusing capacity and its components (DM and Vc) in young, healthy smokers
Respiration; International Review of Thoracic Diseases
|January 1, 1980
Summary
Smoking significantly lowers diffusing capacity (TF) and membrane diffusing capacity (DM) in healthy males. However, alveolar volume (Vc) remains unaffected, suggesting it is influenced by carboxyhemoglobin levels rather than smoking itself.
Area of Science:
- Pulmonary Physiology
- Respiratory Medicine
- Environmental Health
Background:
- Smoking is a major risk factor for lung disease.
- Diffusing capacity of the lungs is a key measure of respiratory function.
- Components of diffusing capacity include membrane diffusing capacity (DM) and capillary blood volume (Vc).
Purpose of the Study:
- To investigate the impact of smoking on diffusing capacity and its components (DM and Vc) in healthy males.
- To compare smokers and non-smokers with similar biometric and spirographic characteristics.
- To assess the influence of smoking cessation prior to testing on results.
Main Methods:
- Studied two groups of 9 healthy males: smokers and non-smokers.
- Ensured similar age, biometric data, and spirographic values between groups.
- Smokers abstained from smoking for 12 hours before testing to standardize results.
Main Results:
- Transfer factor (TF) and membrane diffusing capacity (DM) were significantly lower in smokers compared to non-smokers (p<0.005 and p<0.01, respectively).
- Alveolar volume (Vc) did not differ significantly between the two groups.
- Results confirm that Vc is influenced by carboxyhemoglobin (COhb) levels.
Conclusions:
- Smoking impairs lung diffusing capacity, specifically affecting the transfer factor and membrane diffusion.
- Alveolar volume (Vc) appears to be less sensitive to short-term smoking cessation and more related to carboxyhemoglobin levels.
- These findings highlight the detrimental effects of smoking on lung function even in seemingly healthy individuals.