title: Intravascular ultrasound assessment of cobalt chromium versus stainless steel drug-eluting stent expansion.
abstract: It is not clear whether the thin struts and different alloy of a cobalt chromium stent will cause greater acute stent recoil compared to conventional stainless steel stents. We used postintervention intravascular ultrasound (IVUS) examinations to study 99 patients with 116 stented lesions: 61 Xience/Promus stents (cobalt chromium stent group) and 27 Taxus Liberté and 28 Cypher stents (stainless steel stent group). The IVUS images were obtained before and immediately after stent implantation with only the stent-delivery balloon. The ratio of the IVUS-measured to manufacturer-predicted stent diameter and area was the measure of acute stent recoil and expansion. The baseline patient characteristics, lesion morphology, and procedural details were comparable between the 2 groups. The ratio of the IVUS-measured to manufacturer-predicted stent diameter and area was 0.74 versus 0.73 (p = 0.57) and 0.63 versus 0.63 (p = 0.69), respectively, for the cobalt chromium and stainless steel stents. In conclusion, the acute performance of Xience/Promus was similar to that of previous stainless steel stents, and the thinner cobalt chromium metallic platform did not compromise the radial strength of the stent.
authors.affiliation: Cardiovascular Research Foundation, Columbia University Medical Center-New York Presbyterian Hospital, New York, NY, USA.
authors.forename: Yong
authors.initials: Y
authors.lastname: He
authors.forename: Akiko
authors.initials: A
authors.lastname: Maehara
authors.forename: Gary S
authors.initials: GS
authors.lastname: Mintz
authors.forename: Harpreet
authors.initials: H
authors.lastname: Bharaj
authors.forename: Celia
authors.initials: C
authors.lastname: Castellanos
authors.forename: Srinivas
authors.initials: S
authors.lastname: Kesanakurthy
authors.forename: Xiaofan
authors.initials: X
authors.lastname: Wu
authors.forename: Ning
authors.initials: N
authors.lastname: Guo
authors.forename: So-Yeon
authors.initials: SY
authors.lastname: Choi
authors.forename: Martin B
authors.initials: MB
authors.lastname: Leon
authors.forename: Gregg W
authors.initials: GW
authors.lastname: Stone
authors.forename: Roxana
authors.initials: R
authors.lastname: Mehran
authors.forename: Leroy E
authors.initials: LE
authors.lastname: Rabbani
authors.forename: Jeffrey W
authors.initials: JW
authors.lastname: Moses
mesh_terms: D000368:Aged; D015906:Angioplasty, Balloon, Coronary / Q000379:methods*; D002858:Chromium Alloys / Q000494:pharmacology*; D020099:Coated Materials, Biocompatible; D023921:Coronary Stenosis / Q000000981:diagnostic imaging / Q000601:surgery*; D003331:Coronary Vessels / Q000000981:diagnostic imaging; D054855:Drug-Eluting Stents; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D011184:Postoperative Period; D011474:Prosthesis Design; D015203:Reproducibility of Results; D012189:Retrospective Studies; D013193:Stainless Steel; D018084:Ultrasonography, Interventional / Q000379:methods*
chemical_list: D002858:Chromium Alloys; D020099:Coated Materials, Biocompatible; D013193:Stainless Steel