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Eur Heart J Cardiovasc Imaging. 2015 Dec;16(12):1390-8. doi: 10.1093/ehjci/jev108. Epub 2015 Apr 29.

Impacts of lesion angle on incidence and distribution of acute vessel wall injuries and strut malapposition after drug-eluting stent implantation assessed by optical coherence tomography.

Author information

1
Cardiology Division, Massachusetts General Hospital, Harvard Medical School, GRB 800, 55 Fruit Street, Boston, MA 02114, USA.
2
First Department of Medicine, Nara Medical University, Nara, Japan.
3
Massachusetts Institute of Technology, Cambridge, MA, USA.
4
Cardiology Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.
5
Cardiology Division, Massachusetts General Hospital, Harvard Medical School, GRB 800, 55 Fruit Street, Boston, MA 02114, USA Department of Cardiology, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.
6
Kyung Hee University Hospital, Seoul, Republic of Korea.
7
Kyung Hee University Hospital at Gangdong, Seoul, Republic of Korea.
8
University of Vermont, Burlington, VT, USA.
9
Queen Mary Hospital, Pok Fu Lam, Hong Kong.
10
Cardiology Division, Massachusetts General Hospital, Harvard Medical School, GRB 800, 55 Fruit Street, Boston, MA 02114, USA Kyung Hee University Hospital, Seoul, Republic of Korea ijang@mgh.harvard.edu.

Abstract

AIMS:

To investigate the impact of lesion angle on the incidence and distribution of acute vessel wall injuries and incomplete stent apposition (ISA) following second-generation drug-eluting stent (DES) implantation using optical coherence tomography (OCT). Several ex vivo studies demonstrated that angled arterial walls are exposed to imbalanced mechanical stress from deployed stents.

METHODS AND RESULTS:

We included 243 lesions treated with a single DES (148 everolimus-eluting stent and 95 zotarolimus-eluting stent). Angled lesions were defined as lesions with angle ≥45° on an angiogram (n = 58). The vessel wall injuries and ISA were evaluated by OCT. The results were compared with non-angled lesions (<45°, n = 185). The incidence of instent dissection, thrombus, and ISA was significantly higher in the angled group than in the non-angled group (84.5 vs. 63.2%, P < 0.01; 55.2 vs. 35.1%, P < 0.01; 75.9 vs. 44.9%, P < 0.001, respectively). In the angled group, the normalized tissue protrusion volume around the centre of angle (6.59 ± 6.81, mm(3) × 10(2)) was higher than in the distal sub-segment (2.21 ± 2.87, mm3 × 10(2), P < 0.001), in the proximal sub-segment (4.14 ± 5.34, mm3 × 10(2), P = 0.02), and in the non-angled group (3.30 ± 2.81, mm3 × 10(2), P < 0.001). The incidence of major adverse cardiac events within 12 months was similar between the groups.

CONCLUSIONS:

Angled coronary lesions had a higher incidence rate of OCT-detected vessel wall injuries and ISA compared with non-angled lesions following second-generation DES implantation. Further studies are needed to understand the long-term clinical significance of these findings.

KEYWORDS:

Drug-eluting stent; Optical coherence tomography; Post-stent complication

PMID:
25925215
DOI:
10.1093/ehjci/jev108
[Indexed for MEDLINE]

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