Figure 2.

Correlation between flow-mediated dilation (left column) and pulse wave velocity (right column) with forced expiratory volume during the first second (FEV₁), diffusing capacity for carbon monoxide (DLCO) and systolic pulmonary artery pressure (PAPs; estimated by doppler echocardiography in patients with tricuspid regurgitation and thus a measurable PAPs or measured at right heart catheterization). Patients are grouped as non-smoking controls, smoking controls, chronic obstructive pulmonary disease (COPD) without pulmonary vascular disease (PVD) [COPD PVD(-)] and COPD with PVD [COPD PVD(+)].