Abstract
Recent advances in drug-eluting stent (DES) technology have succeeded in preventing restenosis. In addition to inhibiting smooth muscle cell proliferation, DES greatly inhibits the local inflammatory response in the acute phase after implantation, leading to prevention of restenosis. However, a unique issue in DES implantation is an impairment of reendothelialization, which may result in abnormal wound healing. Consequently, a late-phase inflammatory relapse could appear in the long term after DES implantation. In this study, we measured serum levels of inflammatory markers, including interleukin (IL)-6, IL-8, tumor necrosis factor-α, monocyte chemoattractant protein-1, matrix metalloproteinase-9, and myeloperoxidase, as well as high-sensitivity C-reactive protein at follow-up coronary angiography (mean 9 months) in 54 patients who received DES stenting who did not experience restenosis, and compared them with 51 patients receiving bare-metal stents (BMS) without restenosis. The level of IL-6 was over the measurement threshold (≥2.22 pg/ml) in 12 patients (21 %) in the DES group, but in only 2 patients (4 %) in the BMS group (P = 0.003). IL-8 was significantly higher in the DES group than in the BMS group (4.51 ± 2.40 vs 3.84 ± 1.34 pg/ml, P = 0.015). The levels of other biomarkers were similar between the two groups. DES showed an increase in inflammatory cytokines in the late phase after implantation in comparison with patients who received BMS, suggesting late-stage inflammation. Therefore, the wound-healing response after DES implantation might be different from that after BMS.
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Taguchi, I., Yoneda, S., Abe, S. et al. The late-phase inflammatory response after drug-eluting stent implantation. Heart Vessels 29, 213–219 (2014). https://doi.org/10.1007/s00380-013-0357-7
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DOI: https://doi.org/10.1007/s00380-013-0357-7