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PA/A ratio, but not PA size, was associated with age, which was due to the relation of the aortic diameter with age.[...] we further used the PA size and this showed a correlation with partial blood oxygen pressure level and blood eosinophil count, whereas the latter association was not found in relation to mPAP (ßvalue-0.214; SE 0.032; P= 0.015 and ßvalue 0.233; SE 0.147; P= 0.003, for p02 and eosinophil count respectively). Conclusion: We found an association of pulmonary artery size with arterial blood oxygen level and blood eosinophil count, but not with lung function, emphysema score or airway wall thickness in patients with end-stage COPD.