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. 2023 Jan 5;13(2):193. doi: 10.3390/diagnostics13020193

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Coronary flow velocity domain representation, showing diastolic peak velocity during hyperemia (DPVh) versus diastolic peak velocity during baseline (DPVb). The traditional index refers to coronary flow velocity reserve (CFVR), defined as the ratio of DPVh and DPVb. The red line is an example of cases for which CFVR equals 2.0, and illustrates that any particular value is not unique. A second metric (indicated by the blue curve where CCFVR = 140 cm/s) is required to fully characterize the situation for an individual patient. The yellow marked point refers to the intersection of the line and the curve, corresponding with the combination DPVb = 62.61 cm/s and DPVh = 125.22 cm/s.