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. 2021 Dec 24;8:744181. doi: 10.3389/fcvm.2021.744181

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Copyright © 2021 Wienemann, Meyer, Mauri, Baar, Adam, Baldus and Halbach.

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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Bland-Altman plots of differences against the means are displayed for RFR (A), dPR[entire] (B), dPR[WFP] (C) and Pd/Pa (D). Solid lines represent the mean bias, enclosed by the limits of agreement (dashed lines). The Bland-Altman plots demonstrate a good agreement between FFR and NHPRs. dPR[entire], diastolic pressure ratio during entire diastole; dPR[WFP], diastolic pressure ratio during wave-free period; FFR, fractional flow reserve; NHPR, non-hyperemic pressure ratio; Pa, aortic pressure; Pd, distal coronary pressure; RFR, resting full-cycle ratio.