Comparison of optical flow ratio and fractional flow ratio in stent-treated arteries immediately after percutaneous coronary intervention

Abstract

Background: Optical flow ratio (OFR) is a recently developed method for functional assessment of coronary artery disease based on computational fluid dynamics of vascular anatomical data from intravascular optical coherence tomography (OCT). The purpose of this study was to investigate the relationship between OFR and fractional flow reserve (FFR) in stent-treated arteries immediately after percutaneous coronary intervention (PCI). Methods and Results: The OFR and FFR were measured in 103 coronary arteries immediately after successful PCI with a stent. An increase in the OFR and FFR values within the stent was defined as in-stent ΔOFR and ΔFFR, respectively. The values of FFR and OFR were 0.89±0.06 and 0.90±0.06, respectively. OFR was highly correlated with FFR (r=0.84, P<0.001). OFR showed a good agreement with FFR, presenting small values of mean difference and root-mean-squared deviation (FFR-OFR: -0.01±0.04). In-stent ΔOFR showed a moderate correlation (r=0.69, P<0.001) and good agreement (in-stent ΔFFR - in-stent ΔOFR: 0.00±0.02) with in-stent ΔFFR. Conclusions: OFR showed a high correlation and good agreement with FFR in stent-treated arteries immediately after PCI.