Repeat intervention for in-stent restenosis: re-expansion of the initial stent is a predictor of recurrence of restenosis.
BACKGROUND
In-stent restenosis has become a significant clinical problem as use of stents has increased. The optimal strategy for dealing with in-stent restenosis needs to be evaluated.


OBJECTIVE
To compare the acute and late results of interventions for in-stent restenosis according to the device used, and to analyze the clinical and procedural variables of the lesions treated and identify the determinants of recurrence of restenosis and target lesion revascularization (TLR).


METHODS
Procedural and late outcomes for 58 lesions in 50 patients who underwent repeat intervention for in-stent restenosis were analyzed. The results of interventions according to the device employed were compared. The predictors of recurrence of restenosis and TLR within 6 months were analyzed. The ratio of balloon diameter in repeat intervention to minimal lumen diameter after initial stenting (MLD0) was used as an index of re-expansion of stents. Serial intravascular ultrasound imaging was performed before and after repeat intervention for 33 lesions, and re-expansion of the initial stent was evaluated.


RESULTS
Repeat intervention was successful in treating all lesions. Angiographic follow-up was possible for 49 lesions (84%). The overall incidences of recurrence of restenosis and TLR were 40.1 and 27.6%, respectively. Despite the immediate results having been good, the late results of stenting for in-stent restenosis were not favorable. Diffuse-type in-stent restenosis, early in-stent restenosis, and balloon diameter:MLD0 ratio > 1.25 are independent predictors of poor late results. Intravascular ultrasound findings have shown that expansion of the initial stent leads to recurrence of restenosis and TLR.


CONCLUSIONS
Re-expansion of the initial stent can cause further vascular injury and there is a risk of recurrence of restenosis. Alternative therapeutic strategies that work without dilating the initial stent may be necessary for treating lesions with high risk of recurrence of restenosis.
Ishikawa
S
S
Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan.
Asakura
Y
Y
Okabe
T
T
Sakamoto
M
M
Shibata
M
M
Asakura
K
K
Mitamura
H
H
Ogawa
S
S
D000368:Aged; D015906:Angioplasty, Balloon, Coronary; D017023:Coronary Angiography; D003327:Coronary Disease / Q000628:therapy*; D005260:Female; D006801:Humans; D008297:Male; D015999:Multivariate Analysis; D011184:Postoperative Period; D011379:Prognosis; D012008:Recurrence; D012086:Reoperation; D012307:Risk Factors; D015607:Stents