title: Impact of carbon coating on the restenosis rate after stenting of atherosclerotic renal artery stenosis.
abstract: OBJECTIVE
  To investigate the impact of carbofilm coating and low-profile rapid exchange stent devices on the restenosis rate after stent-angioplasty of atherosclerotic renal artery stenosis (RAS).
  
  
  METHODS
  During a 2-year period (7/2002-7/2004), 143 consecutive patients with 179 primary ostial atherosclerotic RAS>or=70% diameter stenosis were treated with stents selected at the discretion of the operator. Eighteen patients (32 lesions) treated with 9 different types of stents were excluded from the analysis, leaving 125 patients (69 men; mean age 67 years, range 42 to 90) with 147 lesions who received either a Radix carbofilm-coated stent in 78 (53%) lesions (68 [54%] patients) or a Palmaz Genesis bare stainless steel stent in 69 (47%) lesions (57 [46%] patients). The target vessel diameter ranged from 5 to 7 mm.
  
  
  RESULTS
  Baseline characteristics were similar in both groups except the mean stent diameter, which was larger in the bare stent cohort (6.4+/-0.7 versus 5.9+/-0.5 mm, p<0.001). Primary success was 100% in both groups; the initial mean diameter stenosis was reduced from 79%+/-14% and 80%+/-14% in the coated versus bare stent groups to 3+/-5% and 2+/-6%, respectively. After a mean follow-up of 22+/-5 months, the restenosis rate was 6.4% for the coated stent and 5.8% for the bare stent (p=0.87). For the entire cohort, restenosis rates varied significantly (p<0.05) according to stent diameter: 19% (5/26) for 5 mm, 4% (3/81) for 6 mm, and 2.5% (1/40) for 7 mm. In a binary logistic regression analysis including carbofilm coating, stent diameter, gender, diabetes, smoking status, and body mass index, stent diameter was the only independent predictor of restenosis (odds ratio 0.12, 95% CI 0.03 to 0.48 [p=0.003] for a 1-mm increase in vessel diameter).
  
  
  CONCLUSIONS
  Using modern low-profile stent devices, carbofilm coating does not significantly reduce the restenosis rate compared to a bare metal stent. With contemporary stent devices, the restenosis rate has been decreasing compared to earlier reports in the literature.
authors.affiliation: Department of Angiology, Herz Zentrum Bad Krozingen, Germany. thomas.zeller@herzzentrum.de
authors.forename: Thomas
authors.initials: T
authors.lastname: Zeller
authors.forename: Aljoscha
authors.initials: A
authors.lastname: Rastan
authors.forename: Martin
authors.initials: M
authors.lastname: Kliem
authors.forename: Uwe
authors.initials: U
authors.lastname: Schwarzwälder
authors.forename: Ulrich
authors.initials: U
authors.lastname: Frank
authors.forename: Karlheinz
authors.initials: K
authors.lastname: Bürgelin
authors.forename: Thomas
authors.initials: T
authors.lastname: Schwarz
authors.forename: Pietro
authors.initials: P
authors.lastname: Amantea
authors.forename: Christian
authors.initials: C
authors.lastname: Müller
authors.forename: Franz-Josef
authors.initials: FJ
authors.lastname: Neumann
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D050197:Atherosclerosis / Q000000981:diagnostic imaging / Q000628:therapy*; D019917:Blood Vessel Prosthesis Implantation; D002244:Carbon / Q000627:therapeutic use*; D020099:Coated Materials, Biocompatible / Q000627:therapeutic use*; D005260:Female; D005500:Follow-Up Studies; D006083:Graft Occlusion, Vascular / Q000000981:diagnostic imaging / Q000209:etiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D011183:Postoperative Complications / Q000000981:diagnostic imaging / Q000209:etiology; D012078:Renal Artery Obstruction / Q000000981:diagnostic imaging / Q000628:therapy*; D015607:Stents; D016896:Treatment Outcome; D018615:Ultrasonography, Doppler, Color
chemical_list: D020099:Coated Materials, Biocompatible; D002244:Carbon