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Intravascular ultrasound predictors of restenosis after percutaneous transcatheter coronary revascularization
G S Mintz1, J J Popma, A D Pichard
1Intravascular Ultrasound Imaging Laboratory, Washington Hospital Center, Washington, DC.
Insights
Intravascular ultrasound (IVUS) postintervention measurements are better predictors of restenosis after coronary revascularization than traditional methods. These findings improve understanding of restenosis pathophysiology.
Area of Science:
- Cardiovascular Imaging
- Interventional Cardiology
- Medical Device Technology
Background:
- Restenosis is a primary limitation of percutaneous transcatheter coronary revascularization.
- Mechanisms of restenosis are not fully understood, but risk factors include lesion calcium, atherosclerosis, small lumen dimensions, residual plaque, and tissue trauma.
- Intravascular ultrasound (IVUS) provides detailed imaging of coronary lesions before and after intervention.
Purpose of the Study:
- To identify predictors of angiographic restenosis using pre- and postintervention IVUS.
- To enhance understanding of restenosis pathophysiology through IVUS-derived predictors.
- To compare the predictive power of IVUS with traditional clinical and angiographic risk factors.
Main Methods:
- 360 nonstented native coronary artery lesions in 351 patients were analyzed.
- Follow-up angiography was performed 6.4 months later.
- Quantitative coronary angiography and IVUS analyses were conducted by core laboratories, assessing restenosis (>50% diameter stenosis), follow-up stenosis, late lumen loss, and minimal lumen diameter.
Main Results:
- Preintervention and postintervention IVUS measurements predicted late angiographic outcomes.
- Postintervention IVUS cross-sectional narrowing (plaque + media/external elastic membrane area) was the most consistent predictor of restenosis and secondary endpoints.
- IVUS variables demonstrated superior predictive capability compared to angiographic assessments.
Conclusions:
- Intravascular ultrasound variables are more powerful predictors of angiographic restenosis than clinical or angiographic risk factors.
- IVUS offers enhanced insights into the pathophysiology of restenosis.
- Postintervention IVUS assessment is crucial for predicting restenosis after coronary interventions.
Objectives:
This study sought to evaluate preintervention and postintervention intravascular ultrasound studies for potential predictors of angiographic restenosis and to use ultrasound predictors of restenosis to enhance our understanding of the pathophysiology of the restenosis disease process.
Background:
Restenosis remains the major limitation of percutaneous transcatheter coronary revascularization. Although its mechanisms remain incompletely understood, numerous studies have identified some of the clinical, anatomic and procedural risk factors for restenosis. Intravascular ultrasound imaging of target lesions before and after catheter-based treatment consistently demonstrates more target lesion calcium, more extensive reference segment atherosclerosis, smaller final lumen dimensions, significant residual plaque burden and a greater degree of tissue trauma than is evident by angiography.
Methods:
Intravascular ultrasound studies were performed in 360 nonstented native coronary artery lesions (final diameter stenosis 18 +/- 11%) in 351 patients for whom follow-up angiographic data were available 6.4 +/- 3.6 months later. Hospital charts were reviewed, and qualitative and quantitative coronary angiographic and intravascular ultrasound analyses were performed by independent core laboratories. Four dependent angiographic end points were tested: restenosis as a binary definition (> or = 50% diameter stenosis at follow-up) was the primary end point; follow-up diameter stenosis, late lumen loss and follow-up minimal lumen diameter were the secondary end points.
Results:
Reference vessel size, the preintervention quantitative coronary angiographic assessment of lesion severity and the postintervention intravascular ultrasound cross-sectional measurements predicted the late angiographic results. In particular, the intravascular ultrasound postintervention cross-sectional narrowing (plaque plus media cross-sectional area divided by external elastic membrane cross-sectional area) predicted the primary end point (restenosis) and two of the three secondary end points (follow-up diameter stenosis and late lumen loss) and was therefore the most consistent predictor of restenosis.
Conclusions:
Intravascular ultrasound variables are more powerful and consistent predictors of angiographic restenosis than currently accepted clinical or angiographic risk factors.