Assessment of vascular response to BiOSS LIM C stents vs Orsiro stents in the porcine coronary artery model.

Aims: The optimal treatment strategy for coronary bifurcation lesions is still unknown. The aim of the study was to assess applicability of the new cobalt-chromium version of the sirolimus-eluting dedicated bifurcation BiOSS LIM C stent in comparison with regular sirolimus-eluting Orsiro  stent in a porcine coronary model.

Methods: A total of 13 BiOSS LIM C stents and 6 Orsiro stents were implanted in normal nonatherosclerotic porcine straight coronary arteries of six animals using 1.2:1.0 stent-to-artery ratio. Stent geometry and morphology were evaluated by Faxitron imaging. Vascular response was assessed by quantitative coronary angiography (QCA), optical coherence tomography (OCT), and histological analyses.

Results: OCT performed at 28 days confirmed that all stents were patent with no signs of thrombus. In morphometric analysis, no differences between groups regarding stent diameter (P=.141), neointima area (P=.247), % area stenosis (P=.293), or % diameter stenosis (P=.069) were observed. Also, no significant differences were noted between groups regarding their histopathology scores. The injury and inflammation scores were low (mean grade<1) in all groups.

Conclusions: The novel BiOSS LIM C stent demonstrates good short-term vascular effects in a porcine coronary bifurcation model which are comparable with Orsiro stents.