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Angiographic and intravascular ultrasound predictors of in-stent restenosis
Insights
Predictors of in-stent restenosis include longer stent length and smaller lumen diameter. Intravascular ultrasound (IVUS) guidance and optimizing stent cross-sectional area (CSA) may reduce restenosis rates.
Area of Science:
- Cardiovascular Medicine
- Interventional Cardiology
- Medical Imaging
Background:
- Intracoronary stents reduce restenosis compared to balloon angioplasty.
- In-stent restenosis remains a significant clinical challenge.
Purpose of the Study:
- Identify predictors of in-stent restenosis.
- Analyze data from a high-volume, single-center practice.
Main Methods:
- Prospective analysis of 1,706 patients and 2,343 lesions treated with intracoronary stents.
- Utilized high-pressure balloon inflations and intravascular ultrasound (IVUS) guidance.
- Assessed clinical, angiographic, and IVUS variables to predict in-stent restenosis (> or =50% diameter stenosis).
Main Results:
- In-stent restenosis occurred in 25% of lesions.
- Longer total stent length, smaller reference lumen diameter, and smaller final minimal lumen diameter (MLD) were significant predictors.
- IVUS guidance (24% restenosis) showed a trend towards lower rates than no IVUS (29%).
- IVUS stent lumen cross-sectional area (CSA) was a superior predictor in IVUS-guided lesions.
Conclusions:
- Optimizing stent lumen CSA with IVUS guidance is crucial.
- Minimizing total stent length may reduce in-stent restenosis.
- IVUS provides valuable insights beyond traditional angiography for predicting restenosis.
Objectives:
This study was performed to determine predictors of in-stent restenosis from a high volume, single-center practice.
Background:
Intracoronary stents have been shown to reduce the restenosis rate as compared with balloon angioplasty, but in-stent restenosis continues to be an important clinical problem.
Methods:
Between April 1993 and March 1997, 1,706 patients with 2,343 lesions were treated with a variety of intracoronary stents. The majority of stents were placed with high pressure balloon inflations and intravascular ultrasound (IVUS) guidance. Angiographic follow-up was obtained in 1,173 patients with 1,633 lesions (70%). Clinical, angiographic and IVUS variables were prospectively recorded and analyzed by univariate and multivariate models for the ability to predict the occurrence of in-stent restenosis defined as a diameter stenosis > or =50%.
Results:
In-stent restenosis was angiographically documented in 282 patients with 409 lesions (25%). The restenosis group had a significantly longer total stent length, smaller reference lumen diameter, smaller final minimal lumen diameter (MLD) by angiography and smaller stent lumen cross-sectional area (CSA) by IVUS. In lesions where IVUS guidance was used, the restenosis rate was 24% as compared with 29% if IVUS was not used (p < 0.05). By multivariate logistic regression analysis, longer total stent length, smaller reference lumen diameter and smaller final MLD were strong predictors of in-stent restenosis. In lesions with IVUS guidance, IVUS stent lumen CSA was a better independent predictor than the angiographic measurements.
Conclusions:
Achieving an optimal stent lumen CSA by using IVUS guidance during the procedure and minimizing the total stent length may reduce in-stent restenosis.