Negative vascular remodelling after implantation of bioabsorbable magnesium alloy stents in porcine coronary arteries: a randomised comparison with bare-metal and sirolimus-eluting stents

Heart
M MaengL Thuesen

Abstract

We sought to assess vascular remodelling and neointima formation after implantation of bioabsorbable magnesium alloy stents (AMS). Randomised experimental study. AMS (n = 11), sirolimus-eluting stents (Cypher; n = 11) and bare-metal stents (BMS; n = 9) were randomly implanted in 31 porcine coronary arteries (n = 11 pigs). Neointima formation was measured by histomorphometry at 90 days. Vascular remodelling defined as change in external elastic membrane area from index intervention to follow-up was assessed by serial intravascular ultrasound (IVUS). By histomorphometry, lumen (median (quartiles); AMS: 1.75 mm2 (1.07-3.26), Cypher 2.52 mm2 (2.22-5.01), BMS 4.55 mm2 (3.2-7.44); p = 0.013) and external elastic membrane area (AMS: 5.56 mm2 (4.09-6.95), Cypher 7.95 mm2 (6.45-10.92), BMS 9.08 mm2 (7.85-11.63); p = 0.014) were smallest after AMS implantation. By IVUS, external elastic membrane area at follow-up was smallest (AMS: 7.5 (2.8) mm2, Cypher 9.1 (2.7) mm2, BMS 9.9 (3.1) mm2; p = 0.33) and change in external elastic membrane area from index intervention to follow-up (remodelling; AMS: -1.0 (3.1) mm2, Cypher 1.0 (0.8) mm2, BMS 0.9 (1.2) mm2; p = 0.30) was greatest in the AMS group. In a dichotomised IVUS assessment of vascular ...Continue Reading

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