Severe Pulmonary Hypertension in COPD: Impact on Survival and Diagnostic Approach.

Of note, in this analysis, only patients with severe PH were included, which may explain why some previously described prognostic parameters for COPD or for group 3 PH, such as lung diffusion capacity for carbon monoxide 19 , 20 or pulmonary artery enlargement, 18 , 21 , 22 , 23 did not reach statistical significance.

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