Endobronchial changes in chronic pulmonary venous hypertension

Area of Science:

• Pulmonary Circulation
• Vascular Biology
• Respiratory Medicine

Background:

• The bronchial venous system interacts closely with pulmonary circulation.
• Chronic pulmonary venous hypertension can alter bronchial circulation.
• Mitral stenosis is a common cause of pulmonary venous hypertension.

Purpose of the Study:

• To assess changes in bronchial circulation in patients with chronic pulmonary venous hypertension.
• To investigate the relationship between bronchial vessel dilation and pulmonary hemodynamics.
• To evaluate the effect of surgical intervention on bronchial circulation.

Main Methods:

• Fiberoptic bronchoscopy and right heart catheterization were performed in 31 patients with mitral stenosis.
• A visual 'vessel dilatation score' assessed submucosal vessel dilation.
• Correlation analysis between the vessel dilatation score and hemodynamic parameters.

Main Results:

• A nonpulsatile submucosal vessel dilatation was observed in all patients.
• The vessel dilatation score correlated significantly with pulmonary artery wedge pressure (r=0.687) and mean pulmonary artery pressure (r=0.531).
• The vessel dilatation score decreased after surgical reduction of left atrial pressure.

Conclusions:

• Dilated bronchial vessels in mitral stenosis patients are likely engorged bronchial veins.
• These changes are secondary to increased blood flow via bronchopulmonary anastomoses.
• Bronchial circulation alterations are linked to the severity of pulmonary venous hypertension.