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. 2022 Sep;100(3):369-377.
doi: 10.1002/ccd.30298. Epub 2022 Jun 20.

Comparison of adenosine-independent pressure indices to fractional flow reserve in stent-jailed bifurcation side branches

Johannes Michael Altstidl  1 , Stephan Achenbach  1 , Mohamed Marwan  1 , Monique Tröbs  1 , Nora Schacher  1 , Paul Ferstl  1 , Andreas Gerlach  1 , Christian Schlundt  1 , Luise Gaede  1
Affiliations

Comparison of adenosine-independent pressure indices to fractional flow reserve in stent-jailed bifurcation side branches

Johannes Michael Altstidl et al. Catheter Cardiovasc Interv. 2022 Sep.

Abstract

Objectives and background: This study aims to evaluate whether the high correlation and classification agreement of the instantaneous wave-free ratio (iFR) and the resting distal coronary to aortic pressure ratio (Pd /Pa ) with the fractional flow reserve (FFR) can be confirmed in stent-jailed side branches (J-SB).

Methods: Consecutive patients (n = 49) undergoing provisional stenting were prospectively enrolled and a physiological assessment of the J-SB (n = 51) was performed. FFR, iFR, and Pd /Pa were measured and the hemodynamic relevance was determined using cutoff values of ≤0.80, ≤0.89, and ≤0.92, respectively.

Results: Both iFR (r = 0.75) and Pd /Pa (r = 0.77) correlated closely with FFR. Classification agreement with FFR was 78% for iFR (81% sensitivity, 77% specificity) and 75% for Pd /Pa (63% sensitivity and 80% specificity). However, angiographic diameter stenosis and pressure indices correlated poorly. For a threshold of ≥70% stenosis, agreement concerning hemodynamic relevance was found in 59% for FFR, 69% for iFR, and 61% for Pd /Pa .

Conclusion: As reported for other lesion types, FFR and the adenosine-independent pressure indices iFR and Pd /Pa show close correlation and a high classification agreement of approximately 75%-80% in J-SB. Therefore, iFR can be regarded as a recommendable alternative to FFR for the guidance of provisional stenting in bifurcation lesions.

Keywords: catheterization diagnostic; coronary artery disease; fractional flow reserve.

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