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. 2019 Sep 9;21:57. doi: 10.1186/s12968-019-0569-9

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — The air-filled balloon of the balloon wedge-pressure end-hole catheter visualized as a signal void passing through the right heart, pulmonary artery and finally to the wedge position under CMR visualization. Here, the balloon is seen in the a right atrium, b right ventricle, c right ventricular outflow tract, d main pulmonary artery, e right branch pulmonary artery approaching a wedge position, f wedge position