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. 2021 Feb 9;8:638487. doi: 10.3389/fcvm.2021.638487

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Copyright © 2021 Fortuni, Hirasawa, Bax, Delgado and Ajmone Marsan.

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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Grading of tricuspid regurgitation severity. The figure illustrates the main qualitative, semi-quantitative and quantitative parameters of tricuspid regurgitation severity. PISA, proximal isovelocity surface area; RA, right atrium; TV, tricuspid valve.