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. 2022 Feb 25;8:774623. doi: 10.3389/fmed.2021.774623

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Copyright © 2022 He, Liu, Liao, Liu, Lei, Wei, Ruan, Kunwar, Lu, Wang and Wang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Forest plot of combined analysis on PH identification among COPD. OR, odds ratio; RVD, the right ventricular diameter measured by Doppler Echocardiography; RAD, the transverse diameter of right atrium measured by Doppler Echocardiography.