In vivo evaluation of axial integrity of coronary stents using intravascular ultrasound: Insights on longitudinal stent deformation.
OBJECTIVE
To evaluate the axial integrity of different coronary stents using intravascular ultrasound (IVUS).


BACKGROUND
Longitudinal stent deformation was recently reported.


METHODS
Consecutive patients who underwent IVUS analysis after drug-eluting stent (DES) implantation for de novo coronary lesions were evaluated. Stent length was compared with label length for calculation of absolute change and relative difference (absolute change divided by label length).


RESULTS
A total of 233 DES utilizing five different platforms were included. The median absolute change in stent length was 0.90 mm (interquartile range [IQR] 0.48-1.39) and the relative difference was 5.24% (IQR 2.55-8.29). There was no significant difference among the groups in median absolute or relative change: Cypher 0.89 mm/3.89%, Taxus 0.88 mm/5.39%, Endeavor 1.16 mm/6.77%, Xience V 0.86 mm/5.80%, and PROMUS Element 0.79 mm/5.34% (P = 0.085, P = 0.072, respectively). Multivariate logistic regression revealed that the Cypher stent was independently correlated with a lower change in length, whereas stent label length and deployment pressure were correlated with higher absolute change.


CONCLUSIONS
The axial integrity of DES platforms examined in vivo was high, with only mild changes in stent length after implantation. While there are differences between first- and second-generation DES, axial integrity among second-generation DES was similar.
Interventional Cardiology, MedStar Washington Hospital Center, Washington, District of Columbia.
Danny
D
Dvir
Hironori
H
Kitabata
Israel M
IM
Barbash
Sa'ar
S
Minha
Salem
S
Badr
Joshua P
JP
Loh
Fang
F
Chen
Rebecca
R
Torguson
Ron
R
Waksman
D000368:Aged; D017023:Coronary Angiography; D003324:Coronary Artery Disease / Q000000981:diagnostic imaging / Q000601:surgery*; D003331:Coronary Vessels / Q000000981:diagnostic imaging* / Q000601:surgery; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D062645:Percutaneous Coronary Intervention / Q000379:methods*; D011474:Prosthesis Design; D011475:Prosthesis Failure; D015607:Stents; D018084:Ultrasonography, Interventional / Q000379:methods*
axial integrity; drug-eluting stent; longitudinal stent deformation