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. 2020 Mar 3;15:487–499. doi: 10.2147/COPD.S230952

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© 2020 Nakayama et al.

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Relationship between PH assessed by echocardiography and ratio of pulmonary artery diameter to aortic artery diameter. (A) Correlation between eSPAP and PA/Ao in COPD patients. (B) ROC curves of PA/Ao for the prediction of PH assessed by echocardiography. Correlations between continuous variables were evaluated using Spearman’s rank correlation coefficient.

Abbreviations: PH, pulmonary arterial hypertension; eSPAP, estimated systolic pulmonary artery pressure; PA/Ao, ratio of pulmonary artery diameter to aortic artery diameter; COPD, chronic obstructive pulmonary disease; ROC, receiver operating characteristic.