Objective:Confirming complete neointimal coverage after implantation of drug-eluting stent(DES)is clinically important because incomplete stent coverage is maybe responsible for late thrombosis and sudden cardiac death.Optical coherence tomography(OCT)is a high-resolution(≈10 μm)imaging technique capable of detecting a thin layer of neointimal hyperplasia(NIH)inside DES.Helios stent system(KinheIy Bio-tech Co(Shenzhen).Ltd)is a new generation of sirolimus eluting stents.Methods:Motorized optical coherence tomographic pullback was performed at 9-month follow-up to examine consecutive Helios stent mplantations in 10 patients.NIH thickness inside each strut and NIH area percentage inside each cross-section were measured.Results:In total,2063 struts in 296 mm stented segments were analyzed.Overall,NIH thickness were(95.7±66.62)μm,rates of exposed struts was 60.2% and the average NIH area percentage was 5.0618% ± 5.6625%.Conclusion:Our study suggests that dual antiplatelet therapy after Helios stent implantation must be continued at least 9months after DES implantation.
Objective:To evaluate neointimal coverage after Drug Eluting Stent implantation without no restenosis during angiographic follow up by using optical coherence tomography(OCT).Methods:18 case enrolled into this project who received angiography follow up and OCT checkout.Results:1.Totally,4709 struts were analyzed and 88.6% were completely covered with neointimal,and 0.7% were partly covered and 8.1% were uncovered.The rate of late malapposition of struts was 2.6%.The average neointimal hyperplasia thickness was 0.099 mm.2.The rates of uncovered struts,late strut malapposition were different among different types of DES,and so did the average neointimal hyperplasia thickness.3.Compared with DES implantation less than 12 months,the average neointimal hyperplasia thickness increased in the group of DES implantation more than 12 months(0.1183 mm vs 0.0875 mm ;P=0.001),and uncovered struts rate were 1.7% and 6.8%respectively(P<0.05),and late struts malapposition rate were 2.1% and 0.5% respectively(P<0.001).Conclusion:Rate of neointimal coverage over DES at about 16-months follow-up was 90.1%,as the rate of uncoverage was 9.9%.Out study suggests that dual antiplatelet therapy might be continued>16 months after DES implantation.
