[Comparison of clinical and angiographic outcomes between S670 and NIR stents].
OBJECTIVE
This study evaluated the long-term outcomes of successfully implanted S670 and NIR stents.


METHODS
Stents were successfully implanted in 143 patients (148 lesions) aged 65 +/- 9 years from January 1999 to April 2001. Sixty-eight lesions were treated with S670 stents and 80 with NIR stents. Quantitative coronary angiography was performed before, immediately after and 6 months after implantation. An angiographic classification of in-stent restenosis was developed according to the geographic distribution of intimal hyperplasia in reference to the implanted stent. Furthermore, the relationships between stent diameter and length and restenosis rate were estimated.


RESULTS
Type B2/C lesions were significantly more common in patients with S 670 (77.3%) stents compared with NIR (43.6%). Stent length was longer and diameter was smaller in patients with S 670 stents compared with those with NIR stents. Acute-gain was similar in the two groups, but late-loss was significantly greater in patients with S 670 stents compared with those with NIR stents. Restenosis rate and target lesion revascularization rate were similar in the two groups. The diffuse type of restenosis lesion was frequently found in S 670 stents. The stent diameter, but not stent length, influenced the restenosis rate in S 670 stents. Both stent length and diameter influenced the restenosis rate in NIR stents.


CONCLUSIONS
Late-loss was larger and in-stent restenosis of diffuse type was significantly greater in S 670 stents compared with NIR stents. However, stent length was significantly longer and type B2/C lesions were significantly greater in S 670 stents compared with NIR stents. There was no difference in restenosis rate and target lesion revascularization rate. In addition, restenosis rate was not influenced by stent length in S 670 stents, so S 670 stents may be useful for complex lesions.
Kawaguchi
Ren
R
Division of Cardiology, Gunma Prefectural Cardiovascular Center, Kameizumi-machi 3-12, Maebashi, Gunma 371-0004.
Hoshizaki
Hiroshi
H
Oshima
Shigeru
S
Meguro
Kentaro
K
Miyazaki
Akihisa
A
Ito
Sachiko
S
Hiratsuji
Tomoya
T
Tsurugaya
Hideki
H
Ito
Itaru
I
Sekiguchi
Makoto
M
Seta
Yukihiro
Y
Adachi
Hitoshi
H
Toyama
Takuji
T
Naito
Shigeto
S
Taniguchi
Koichi
K
D000368:Aged; D015906:Angioplasty, Balloon, Coronary / Q000379:methods*; D017023:Coronary Angiography; D003327:Coronary Disease / Q000000981:diagnostic imaging / Q000628:therapy*; D023903:Coronary Restenosis / Q000209:etiology; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D015607:Stents / Q000592:standards*; D016896:Treatment Outcome