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Pulmonary vascular resistance in emphysema
L L Schulman1, P F Lennon, J A Wood
1Department of Medicine, College of Physicians and Surgeons, Columbia University, New York.
Chest
|March 1, 1994
Summary
Emphysema patients show mildly increased pulmonary vascular resistance due to microcirculation disruption, similar to interstitial lung disease. This elevation correlates with reduced diffusing capacity but doesn't cause resting pulmonary hypertension without gas exchange issues.
Area of Science:
- Pulmonary Medicine
- Cardiovascular Physiology
- Respiratory Disease Research
Background:
- Emphysema, a form of chronic obstructive pulmonary disease (COPD), involves lung destruction.
- Pulmonary microvasculature plays a critical role in regulating pulmonary blood flow.
- Understanding hemodynamic changes in emphysema is crucial for managing the disease.
Purpose of the Study:
- To investigate the hemodynamic effects of pulmonary microvasculature disruption in emphysema.
- To assess resting pulmonary hemodynamics and lung function in patients with emphysema.
- To compare these findings with those in chronic diffuse interstitial lung disease (ILD).
Main Methods:
- Right heart catheterization was performed in 12 emphysema patients.
- Pulmonary hemodynamics were assessed using the pulmonary diastolic gradient (PDG).
- Lung function was evaluated via spirometry, lung volumes, and single-breath carbon monoxide diffusing capacity (DCOSB).
Main Results:
- Emphysema patients exhibited mildly elevated PDG (mean 5 mm Hg), indicating increased pulmonary vascular resistance.
- PDG showed a strong inverse curvilinear correlation with DCOSB (r = -0.869, p < 0.001).
- The relationship between PDG and DCOSB in emphysema was similar to that observed in ILD.
Conclusions:
- Elevated pulmonary vascular resistance in emphysema arises from microcirculatory disruption, akin to mild-moderate ILD.
- The observed increase in resistance is insufficient to cause resting pulmonary hypertension unless gas exchange is significantly impaired.
- These findings highlight the impact of microvascular changes on pulmonary hemodynamics in emphysema.