Decrease in the frequency of impeded-by-stent phenomenon in the current-model bioresorbable polymer-coated sirolimus-eluting stent

Background: Impeded-by-stent phenomenon (ISP), which is a collision between a normally deployed stent and a tip of a catheter device, temporarily impedes the delivery of catheter devices during percutaneous coronary intervention. We investigated the incidence of ISP in the current-model bioresorbable polymer-coated sirolimus-eluting stent (BP-SES) compared with the old model. Methods: This single-center, observational study included the patients treated using old-model 2.5–4.0mm BP-SESs (Ultimaster Tansei™) in October 2018 and current-model 2.25–2.5mm BP-SESs (Ultimaster Nagomi ^TM SV) from January to April 2022 for patients requiring coronary stents. Two independent operators observed and judged occurrence of ISP, defined as device-delivery disturbances by a newly deployed stent. Results: ISPs were observed in 25 of 256 stented segments (9.8%). Logistic regression analysis demonstrated the use of current-model BP-SESs (OR 0.29, 95 % CI 0.10–0.85, p = 0.02) was an independent predictor of ISP avoidance. Conclusions: This study indicates the current-model BP-SES demonstrates the reduced incidence of impeded-by-stent phenomenon.