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. 2021 Apr 8;36(4):645–653. doi: 10.1007/s10557-021-07162-6

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Examples of suboptimal PCI in vessels with intermediate-low QVP_index. QFR, quantitative flow ratio; MaxQFR_20mm, maximal drop of QFR value in 200 mm; ΔQFRvessel, difference in the QFR values from the beginning to the end of the vessel; LFD, length of the vessel with functional disease; TVL, total vessel length; QVP_index, QFR virtual pullback index; PCI, percutaneous coronary intervention. Yellow arrows indicate the presence of coronary lesions before or after PCI, whereas green lines indicate stented segments in post-PCI images