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Successful stent implantation does not always mean optimal stent deployment and expansion in a sizable portion of patients, and hence subsequent stent thrombosis and restenosis.
We investigated whether StentBoost subtraction (SBS) imaging technique can help in proper stent visualization and assessment of adequate expansion and deployment compared to standard angiography (SA) and its usefulness in procedural success of percutaneous coronary intervention (PCI).
A total of 147 stents were studied following PCI using StentBoost subtraction (SBS) imaging technique compared to SA using Philips machine allura xper FD 10. SBS was acquired as a short digital cine run with deflated two dots balloon inside the studied stent (3-4 seconds) without contrast at 15 frames per seconds. We compared 3 parameters between both imaging techniques: 1-stent visibility classified into 3 grades poor, average and excellent. 2-Stent deployment classified also into 3 grades cannot be evaluated, improper deployment and proper deployment. 3-Usefulness of StentBoost in which StentBoost was considered useful if added more information and helped in proper evaluation and detection of stent under expansion than standard angiography.
Using SA compared to SBS imaging stent visibility was poor in 57.1% of examined stents, average in 40.8% and excellent in 2% compared to 0%, 39.5% and 60.5% using SBS (P<0.001). 68 Stents (46.3%) VS. 0 could not be evaluated, 31 stents (21.1 %) VS. 43 (29.3%) showed improper deployment and 48 stents (32.7%) VS. 104 (70.7%) showed proper deployment (P<0.001). SBS was useful than SA in 73 stents (49.66%), 68 stents were evaluable by SBS not by SA and 5 stents showed improper deployed after using SBS.
SBS imaging improved stent visibility which helped in accurate assessment of stent deployment and seemed useful in 50% of examined stents as compared to SA.