Vascular responses at proximal and distal edges of paclitaxel-eluting stents
Serial intravascular ultrasound analysis from the TAXUS II trial
BACKGROUND: On the basis of brachytherapy experience, edge stenosis has been raised as a potential limitation for drug-eluting stents. We used serial intravascular ultrasound (IVUS) to prospectively analyze vessel responses in adjacent reference segments after implantation of polymer-controlled paclitaxel-eluting stents. METHODS AND RESULTS: TAXUS II was a randomized, double-blind trial with 2 consecutive patient cohorts that compared slow-release (SR) and moderate-release (MR) paclitaxel-eluting stents with control bare metal stents (BMS). By protocol, all patients had postprocedure and 6-month follow-up IVUS. Quantitative IVUS analysis was performed by an independent core laboratory, blinded to treatment allocation, in 5-mm vessel segments immediately proximal and distal to the stent. Serial IVUS was available for 106 SR, 107 MR, and 214 BMS patients. For all 3 groups, a significant decrease in proximal-edge lumen area was observed at 6 months. The decrease was comparable (by ANOVA, P=0.194) for patients in the SR (-0.54+/-2.1 mm2) and MR (-0.88+/-1.9 mm2) groups compared with the BMS (-1.02+/-1.9 mm2) group. For the distal edge, a significant decrease in lumen area was only observed with BMS (-0.91+/-2.0 mm2, P<0.0001); this decrease was significantly attenuated with SR (0.08+/-2.0 mm2) and MR (-0.19+/-1.7 mm2) stents (P<0.0001 by ANOVA). Negative vessel remodeling was observed at the proximal (-0.48+/-2.2 mm2, P=0.011) but not the distal edges of BMS and at neither edge of SR or MR stents. CONCLUSIONS: The marked reduction in in-stent restenosis with SR or MR stents is not associated with increased edge stenosis at 6-month follow-up IVUS. In fact, compared with BMS, there is instead a significant reduction in late lumen loss at the distal edge with TAXUS stents.
|Keywords||*Stents, Comparative Study, Coronary Restenosis/*prevention & control/ultrasonography, Coronary Vessels/*drug effects/surgery/ultrasonography, Double-Blind Method, Drug Delivery Systems, Female, Humans, Male, Middle Aged, Paclitaxel/administration & dosage/*therapeutic use, Treatment Outcome|
|Persistent URL||dx.doi.org/10.1161/01.CIR.0000112566.87022.32, hdl.handle.net/1765/13305|
Serruys, P.W.J.C., Degertekin, M., Tanabe, K., Russell, M.E., Guagliumi, G., Webb, J.G., … Colombo, A.. (2004). Vascular responses at proximal and distal edges of paclitaxel-eluting stents. Circulation (Baltimore), 109(5), 627–633. doi:10.1161/01.CIR.0000112566.87022.32