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Int J Cardiol. 2016 Nov 1;222:436-440. doi: 10.1016/j.ijcard.2016.07.275. Epub 2016 Aug 1.

A novel polymer-free drug-eluting stent coated with everolimus using nitrogen-doped titanium dioxide film deposition in a porcine coronary restenosis model.

Author information

1
Heart Research Center Nominated by Korea Ministry of Health and Welfare, Gwangju, Republic of Korea; Cardiovascular Research Center, Chonnam National University Hospital, Gwangju, Republic of Korea; Korea Cardiovascular Stent Institute, Jangseong, Republic of Korea.
2
Heart Research Center Nominated by Korea Ministry of Health and Welfare, Gwangju, Republic of Korea; Cardiovascular Research Center, Chonnam National University Hospital, Gwangju, Republic of Korea; Korea Cardiovascular Stent Institute, Jangseong, Republic of Korea. Electronic address: myungho@chollian.net.
3
Heart Research Center Nominated by Korea Ministry of Health and Welfare, Gwangju, Republic of Korea; Cardiovascular Research Center, Chonnam National University Hospital, Gwangju, Republic of Korea.

Abstract

BACKGROUND:

Titanium dioxide (TiO2) films have superior biocompatibility and may be effective as drug-binding matrices for drug-eluting stents (DESs). We sought to evaluate efficacy of a polymer-free DES coated with everolimus using nitrogen-doped TiO2 film deposition in a porcine coronary restenosis model.

METHODS:

Forty coronary arteries in 20 pigs were randomly allocated to group 1 (bare-metal stents (BMSs), 3.0×18mm, n=10), group 2 (BMSs with nitrogen-doped TiO2 film deposition, 3.0×18mm, n=10), group 3 [commercial everolimus-eluting stent, 3.0×18mm, n=10], and group 4 (polymer-free everolimus-eluting stent using nitrogen-doped TiO2 film deposition, 3.0×18mm, n=10). Stents were randomly implanted in the left anterior descending coronary artery and left circumflex artery with stent:artery ratio of 1.3. Four weeks later, pigs underwent follow-up coronary angiography and were sacrificed for histopathologic analysis.

RESULTS:

Percent area stenosis was greater in group 1 compared to groups 3 and 4 (46.4±13.8% vs. 30.2±11.7% vs. 29.2±8.9%, respectively, p=0.005). Fibrin score was lower in groups 1 and 2, compared to groups 3 and 4: 0.87±0.67 vs. 0.76±0.61 vs. 2.27±0.24 vs. 1.75±0.31, respectively, p<0.001). Injury score and inflammation score were not different. Comparison between DES showed a higher fibrin score in group 3 than group 4 (2.27±0.24 vs. 1.75±0.31, p=0.023).

CONCLUSIONS:

In a porcine model of coronary restenosis, a novel polymer-free DES using nitrogen-doped TiO2 film deposition shows higher biocompatibility and compares favorably with a commercial DES.

KEYWORDS:

Drug-eluting stents; Polymers; Titanium dioxide

PMID:
27505330
DOI:
10.1016/j.ijcard.2016.07.275
[Indexed for MEDLINE]

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