Low burr-to-artery ratio predict stent underexpansion in patients with high OCT based calcium score underwent rotablator atherectomy

Abstract Background Stent under-expansion is the potent predictor for stent thrombosis. Purpose We aim to determine incidence of and its predictors in patient who undergoing rotational atherectomy (RA) assisted percutaneous coronary intervention (PCI) assessed by optical coherence tomography (OCT). Method The study included 83 consecutive patients OCT guidance RA PCI during January 2016 through September 2020. Baseline clinical characteristics intracoronary imaging data were recorded. was defined as minimal area divided average proximal distal reference lumen <80%. Results Majority (83%) had based calcium score 3–4. 9.6%. Comparing between with optimized expansion under-expansion, has older age (79.1±6 vs 69.8±10.4, p=0.015), higher thickness (1.01±0.83 0.65±0.22, p<0.001), longer length (18.68±1.88 12.69±5.33, p<0.001). lower burr artery ratio (0.53±0.09 0.65±0.09, optimal cut-off values <0.54 predict under-expansion. Conclusion In high underwent PCI, ratio<0.54 a underexpansion. Funding Acknowledgement Type funding sources: None.