Fig. 2From: Risk of bleeding associated with transbronchial biopsy using flexible bronchoscopy in patients with echocardiographic or chest CT evidence of pulmonary hypertensionAxial chest CT image at the level of the left and right main pulmonary arteries. Measurements of the diameter of the main pulmonary artery (PA) and the diameter of the aorta (A) at the level of the bifurcation are used to calculate the PA:A ratio in accordance with a previous report [19]. If the diameter of A is not uniform, two measurements are taken 90 degrees apart, and the larger diameter is usedBack to article page