Xience side branch access stent for treatment of bifurcation coronary disease: a review of preclinical data.
ABSTRACT The Xience Side Branch Access (SBA) stent is an everolimus-eluting stent designed specifically for branching coronary geometry, providing wire access into the side branch (SB) regardless of the planned treatment strategy. The stent is delivered via a low-profile, dual-lumen, and single-tip catheter. A single inflation deploys the stent in the main branch (MB) and opens a portal into the SB. It is through this portal opening, allowing wire access into the SB, that this device differentiates itself from certain other dedicated bifurcation devices currently in various stages of development and testing. The Xience SBA stent was compared with a standard Multi-Link Vision® stent using a provisional T-stenting strategy in an ovine beating heart model. The Xience SBA stent tended to be deployed with less mean contrast usage (21.05 vs. 43.23 mL; P = 0.09), shorter fluoroscopy time (2.55 vs. 4.52 minute; P = 0.12), and lower rates of guidewire entanglement (16% vs. 100%) compared with the workhorse stent. As a result, the total procedure time with the Xience SBA stent was significantly shorter than that with the standard stent (5.46 vs. 8.65 minute; P = 0.01). The Xience SBA stent was also evaluated by four recently trained interventionalists who had no previous experience with the device. Using a perfused synthetic heart model, SB access time was reduced by 54%, average fluoroscopy time was reduced by 46%, and average contrast usage was lowered by 39% with the Xience SBA compared with the standard stent. Initial experience in the ovine model suggests that the Xience SBA stent is also amenable for use in distal left main coronary artery disease, regardless of whether it is deployed in the left ascending coronary artery or left circumflex artery and the portal opened in the opposing vessel. On the basis of these experimental results, the Xience SBA stent is an easy to use and versatile device for the purpose of SB access and potentially for the treatment of bifurcation coronary artery lesions.