Impact of stent deformity induced by the kissing balloon technique for bifurcating lesions on in-stent restenosis after coronary intervention.

ObjectivesTo investigate the impact of stent deformity induced by final kissing balloon technique (KBT) for coronary bifurcation lesions on in-stent restenosis (ISR). BackgroundIn experimental models, the detrimental effects of KBT have been clearly demonstrated, but few data exists regarding the impact of proximal stent deformity induced by KBT on clinical outcomes. MethodsWe examined 370 coronary lesions where intravascular ultrasound (IVUS)-guided second-generation drug-eluting stent (DES) implantation for coronary bifurcation lesions was performed. Based on IVUS analysis, the stent symmetry index (minimum/maximum stent diameter) and stent overstretch index (the mean of stent diameter/the mean of reference diameter) were calculated in the proximal main vessel. ResultsThe stent symmetry index was significantly lower (0.750.07 vs 0.88 +/- 0.06, P<0.0001) and the stent overstretch index was significantly higher (1.04 +/- 0.08 vs 1.01 +/- 0.06, P=0.0007) in lesions with KBT (n=174) compared to those without KBT (n=196). The number of two-stent technique in lesions with KBT was 31 (18%). In multivariate analysis, the degree of stent deformity indices was not associated with ISR in lesions with KBT; however, two-stent technique use was the only independent predictor of ISR at 8 months (hazard ratio: 3.96, 95% confidence interval: 1.25-12.5, P=0.01). ConclusionsSecond-generation DES deformity induced by KBT was not associated with mid-term ISR.