Author + information
- Received November 28, 2011
- Revision received May 24, 2012
- Accepted June 21, 2012
- Published online September 1, 2012.
- Yoshiaki Mitsutake, MD⁎,
- Takafumi Ueno, MD, PhD⁎,⁎ (, )
- Shinji Yokoyama, MD, PhD⁎,
- Ken-ichiro Sasaki, MD, PhD⁎,
- Yusuke Sugi, MD, PhD⁎,
- Yasuyuki Toyama, MD⁎,
- Hiroshi Koiwaya, MD⁎,
- Masanori Ohtsuka, MD⁎,
- Takaharu Nakayoshi, MD⁎,
- Naoki Itaya, MD⁎,
- Hidetoshi Chibana, MD⁎,
- Tatsuyuki Kakuma, PhD† and
- Tsutomu Imaizumi, MD, PhD⁎
- ↵⁎Reprint requests and correspondence:
Dr. Takafumi Ueno, Division of Cardiovascular Medicine, Department of Internal Medicine, Kurume University School of Medicine, 67 Asahi-machi, Kurume 830–0011, Japan
Objectives This study sought to evaluate the relationship between coronary endothelial function and neointimal coverage after drug-eluting stent (DES) implantation.
Background The mechanisms of endothelial dysfunction after DES implantation remain to be fully elucidated. We hypothesized that poor neointimal coverage after DES implantation may be associated with endothelial dysfunction distal to the stent site.
Methods Sixty-six stable angina patients treated with a first-generation DES were enrolled. At 9-month follow-up, coronary endothelial function was evaluated with intracoronary infusion of incremental doses of acetylcholine (10−8, 10−7, and 10−6 mol/l) and nitroglycerin (200 μg). Vascular responses at the segments proximal and distal to the stent site were angiographically and quantitatively measured. At the same time, the degree of neointimal coverage was evaluated using coronary angioscopy and classified into 4 grades: 0 (no coverage) to 3 (full coverage).
Results We divided the subjects into poor-coverage (grades 0 to 1, n = 33) and good-coverage (grades 2 to 3, n = 33) groups. Acetylcholine induced dose-dependent coronary vasoconstrictions in both groups. At the segment distal to the stent, the magnitude of vasoconstriction to acetylcholine in the poor-coverage group was significantly greater than in the good-coverage group (p < 0.001), whereas vasomotor responses proximal to the stent and vasodilation by nitroglycerine were similar between the 2 groups.
Conclusions Coronary endothelial dysfunction distal to the stent was associated with poor neointimal coverage after DES implantation.
All authors have reported that they have no relationships relevant to the contents of this paper to disclose.
- Received November 28, 2011.
- Revision received May 24, 2012.
- Accepted June 21, 2012.
- American College of Cardiology Foundation