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Decrease in Small Pulmonary Vessels on Chest Computed Tomography in Light Smokers Without COPD: An Early Change, but

Shinji Saruya1, Tsuneo Yamashiro2,3, Shin Matsuoka2

  • 1Department of Radiology, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ku, Kawasaki, Kanagawa, 216-8511, Japan. buhi_11_22@yahoo.co.jp.

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Summary

In light smokers without COPD, the area of small pulmonary vessels decreases with smoking amount. This indicates potential early lung injury from smoking, preceding emphysema development.

Keywords:
COPDCross-sectional areaCurrent smokersPack yearsPulmonary vesselsSmoking habits

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Area of Science:

  • Pulmonary Medicine
  • Radiology
  • Cardiovascular Research

Background:

  • Chronic obstructive pulmonary disease (COPD) is a major health concern.
  • Smoking is the primary risk factor for COPD development.
  • Early detection of lung changes in smokers is crucial for intervention.

Purpose of the Study:

  • To investigate the relationship between smoking quantity and small pulmonary vessel cross-sectional area (CSA) in light smokers without COPD.
  • To determine if smoking affects small pulmonary vessels independently of emphysema.
  • To explore potential early vascular changes in the lungs due to smoking.

Main Methods:

  • Retrospective study of 34 light smokers (≤25 pack years) without COPD.
  • Measurement of small pulmonary vessel CSA (<5 mm²) and percentage of total lung CSA (%CSA<5) using CT scans.
  • Assessment of emphysema extent (%LAA) and correlation analysis with pack years and pulmonary function tests (FEV1).

Main Results:

  • A significant negative correlation was found between %CSA<5 and pack years, indicating smaller vessel areas with increased smoking.
  • No significant correlation was observed between emphysema (%LAA) and pack years.
  • Pulmonary function tests (FEV1) did not show significant correlations with smoking history.

Conclusions:

  • Small pulmonary vessel area in light smokers without COPD decreases with smoking amount, suggesting smoking-induced vascular injury.
  • These vascular changes may represent an early stage in COPD development, preceding emphysema.
  • Targeting small pulmonary vessels could be a future strategy for early COPD intervention.