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. 2020 Feb 29;106(10):758–764. doi: 10.1136/heartjnl-2019-316075

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license, which permits others to copy, redistribute, remix, transform and build upon this work for any purpose, provided the original work is properly cited, a link to the licence is given, and indication of whether changes were made. See: https://creativecommons.org/licenses/by/4.0/.

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This patient had a moderately severe mid left circumflex lesion with ^GZFFR physiology with reduced CFVR of 1.5 pre-PCI which improved to a CFVR of 4 post-PCI. The stenosis resistance HSR reduced following PCI with improved FFR. ^GZFFR coronary lesion in mid circumflex indicated by blue arrow before PCI (upper panel) and after PCI with coronary physiology data in the left panel. CFVR, coronary flow velocity reserve; FFR, fractional flow reserve; ^GZFFR, grey zone; HSR, Hyperaemic Stenosis Resistance Index.