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KMID : 0376419970210010153
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Chonbuk University Medical Journal
1997 Volume.21 No. 1 p.153 ~ p.164
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Recoils Following Various Stents Implantation in Vivo
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Abstract
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A number of stents are currently available but their recoil rates in vivo have not been fully documented. To evaluate the effect of various stents design on acute vascular recoil after elective intracoronary scent placement, we analyzed the cineangiograms of 175 patients who underwent deployment of Palmaz-Schatz, Multilink, Cordis tantalum, CrossFlex, Wiktor, Gianturco-Roubin (GR) II and Walls. tent. We also assessed Cordis tantalum and Wiktor stents whether there was a compression or late recoil of these stents itself at long-term follow-up.,
Acute recoil I was defined by the difference between the mean diameter of the final expanded balloon and that of the stented segment. Acute recoil 2 was defined by the difference between the mean diameter of the final_ expanded balloon and the minimal luminal diameter post stenting. Late recoil was calculated by comparing the mean diameter of the stent itself immediately after stent implantation and at follow-up without opacification of the vessel.
Acute recoil I of Palmaz-Schatz stent amounted to 0.20+0.171nm or S.1%. The acute recoil I of Wiktor and GR II stents was larger than that of Palmaz-Schatz stent (0.36±0.22mm and 0.34±0.26 mm or 8.8% and 8.6%, respectively ; p < 0.05). Acute recoil 2 of Palmaz-Schatz stent amounted to 0.46+0.19mm or 12.2%. Acute recoil 2 of Cordis tantalum, Wiktor and GR II stents were 0.62 (0.31 mm, 0.77±0.31 mm and 0.66+0.30mm or 15.9%, 19.3% and 17.3%, respectively, which were significantly different from that of Palmaz-Schatz stent (p < 0.05). A significant late recoil of the stent itself was not observed in Cordis tantalum and Wiktor stents.
In conclusion, the flexible coil design of the stent strongly associated with less radial scaffolding forces than slotted tube stent, particularly if it is constructed of loose configuration or composed of tantalum. But, all stents effectively withstand the elastic recoil only with a minimal acute or late recoil, which may not contribute to late restenosis.
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