Efficacy of fractional flow reserve measurements at side branch vessels treated with the crush stenting technique in true coronary bifurcation lesions

Background: Measurement of fractional flow reserve (FFR) has been frequently used to optimize the results of coronary stenting in patients with significant narrowing of coronary arteries. Hypothesis: There has been a consensus that an FFR value >0.90 after stenting is a useful surrogate for favorable long-termclinical outcome. We evaluated the efficacy of FFR measurement at side branch vessels of true coronary bifurcation lesions that were treatedwith the crush stenting technique. Methods: This study included 12 patients with significant narrowing in both a main coronary vessel and side branch vessel who underwent the crush stenting procedure. Results: After crush stenting, FFR measurement was performed at the side branch vessel prior to and after kissing balloon angioplasty (KBA). FFR values increased significantly, from 0.94 ± 0.04 pre-KBA to 0.97 ± 0.03 post-KBA (P = 0.011). FFR values after crush stenting but prior to KBA alreadymeasured >0.90 in 9 of the 12 patients (75%). FFR values for the remaining 3 patientswere 0.88, 0.88, and 0.90, respectively. Conclusions: FFR measurement at side branch vessels of coronary bifurcation lesions treated with crush stenting may not contribute to adequate decision-making for improvement of long-term clinical outcomes. KBA should be strongly considered for patients with bifurcation lesions treated with crush stenting.