BACKGROUND: Intrastent thrombosis, while rare, has a poor prognosis. Strut non-coverage is one causal factor, especially in cases of resistance to or premature discontinuation of dual antiplatelet therapy. AIM: To compare neointimal coverage with paclitaxel and zotarolimus drug-eluting stents, using optical coherence tomography (OCT). METHODS: Twenty-two drug-eluting stents (11 paclitaxel-eluting stents and 11 zotarolimus-eluting stents) were examined by OCT, 6 months after implantation. Mean neointimal strut-coverage thickness and percentage neointimal hyperplasia were measured every millimetre. On each OCT image, struts were classified into one of four categories: well-apposed to vessel wall with apparent neointimal coverage; well-apposed to vessel wall without neointimal coverage; malapposed to the vessel wall; or located on a major side branch. RESULTS: OCT analysis showed a lower percentage of neointimal hyperplasia with paclitaxel-eluting stents than with zotarolimus-eluting stents (17% vs 38% and mean thickness 154 microm vs 333 microm, respectively; p<0.0001). The rate of strut-coverage was greater with zotarolimus-eluting stents than with paclitaxel-eluting stents (99.1% vs 87.1%, respectively; p<0.0001). A non-covered/covered strut ratio greater than 0.3 was observed in 0.5% of zotarolimus-eluting stent OCT images compared with 18% of paclitaxel-eluting stent OCT images (p<0.0001). CONCLUSION: Six months after implantation, neointimal hyperplasia was greater with zotarolimus-eluting stents compared with paclitaxel-eluting stents. Conversely, neointimal strut-coverage was better with zotarolimus-eluting stents.
BACKGROUND: Intrastent thrombosis, while rare, has a poor prognosis. Strut non-coverage is one causal factor, especially in cases of resistance to or premature discontinuation of dual antiplatelet therapy. AIM: To compare neointimal coverage with paclitaxel and zotarolimus drug-eluting stents, using optical coherence tomography (OCT). METHODS: Twenty-two drug-eluting stents (11 paclitaxel-eluting stents and 11 zotarolimus-eluting stents) were examined by OCT, 6 months after implantation. Mean neointimal strut-coverage thickness and percentage neointimal hyperplasia were measured every millimetre. On each OCT image, struts were classified into one of four categories: well-apposed to vessel wall with apparent neointimal coverage; well-apposed to vessel wall without neointimal coverage; malapposed to the vessel wall; or located on a major side branch. RESULTS: OCT analysis showed a lower percentage of neointimal hyperplasia with paclitaxel-eluting stents than with zotarolimus-eluting stents (17% vs 38% and mean thickness 154 microm vs 333 microm, respectively; p<0.0001). The rate of strut-coverage was greater with zotarolimus-eluting stents than with paclitaxel-eluting stents (99.1% vs 87.1%, respectively; p<0.0001). A non-covered/covered strut ratio greater than 0.3 was observed in 0.5% of zotarolimus-eluting stent OCT images compared with 18% of paclitaxel-eluting stent OCT images (p<0.0001). CONCLUSION: Six months after implantation, neointimal hyperplasia was greater with zotarolimus-eluting stents compared with paclitaxel-eluting stents. Conversely, neointimal strut-coverage was better with zotarolimus-eluting stents.
Authors: Pasi Karjalainen; Tuomas O Kiviniemi; Tuomas Lehtinen; Wail Nammas; Antti Ylitalo; Antti Saraste; Jussi Mikkelsson; Mikko Pietila; Fausto Biancari; Juhani K E Airaksinen Journal: Int J Cardiovasc Imaging Date: 2013-08-31 Impact factor: 2.357
Authors: Tuomas Lehtinen; K E Juhani Airaksinen; Antti Ylitalo; Pasi P Karjalainen Journal: Int J Cardiovasc Imaging Date: 2012-02-24 Impact factor: 2.357