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Published on: February 10, 2012
Coronary physiology and intravascular imaging in surgical and percutaneous revascularization
Adham Elsherbini1, Shubh K Patel1, Tina B Marvasti2
1Temerty Faculty of Medicine, University of Toronto.
Insights
Coronary physiology and intravascular imaging improve percutaneous coronary intervention outcomes by guiding lesion selection and procedural optimization. Their role in coronary artery bypass grafting requires further investigation.
Area of Science:
- Cardiology
- Interventional Cardiology
- Medical Imaging
Background:
- Coronary angiography provides anatomical detail but not functional ischemia assessment.
- Percutaneous coronary intervention (PCI) and coronary artery bypass grafting (CABG) are key revascularization strategies.
- Accurate lesion assessment is crucial for effective revascularization.
Purpose of the Study:
- To review current evidence on coronary physiology and intravascular imaging.
- To evaluate their impact on PCI and surgical revascularization.
- To delineate their established and investigational roles.
Main Methods:
- Review of contemporary evidence on coronary physiology.
- Analysis of data on intravascular imaging techniques (IVUS, OCT).
- Assessment of studies comparing physiology-guided vs. angiography-guided interventions.
Main Results:
- Physiology-guided PCI improves clinical outcomes and lesion selection.
- Intravascular imaging (IVUS, OCT) enhances procedural optimization, especially in complex lesions.
- Post-PCI physiologic testing often reveals residual ischemia despite angiographic success.
- Role in CABG is investigational, with limited demonstrated clinical outcome improvement.
Conclusions:
- Strong evidence supports integrating coronary physiology and intravascular imaging in PCI.
- These modalities refine treatment decisions and improve procedural success.
- Their application in CABG is not yet established and requires further research.
Purpose Of Review:
Coronary angiography remains the principal imaging modality guiding coronary revascularization, but it provides only an anatomic representation of disease and does not reliably identify lesion-specific ischemia. This review summarizes contemporary evidence on coronary physiology and intravascular imaging in percutaneous and surgical revascularization.
Recent Findings:
Physiology-guided percutaneous coronary intervention (PCI) improves clinical outcomes by refining lesion selection and supporting safe deferral of nonflow-limiting stenoses. Fractional flow reserve and instantaneous wave-free ratio are supported by long-term randomized data, while angiography-derived quantitative flow ratio has shown favorable outcomes compared with angiography-guided PCI, although equivalence to pressure-wire-based strategies remains unsettled. In parallel, intravascular ultrasound and optical coherence tomography enhance procedural optimization by improving stent sizing, expansion, and detection of mechanical complications, with the strongest benefit observed in anatomically complex lesions. Postprocedural physiologic testing frequently reveals residual ischemia despite acceptable angiographic results. In coronary bypass surgery, physiologic assessment may refine target selection and clarify mechanisms of competitive flow, and postoperative quantitative flow ratio has been explored in assessing functional completeness; however, consistent improvement in clinical outcomes has not been demonstrated.
Summary:
Current evidence strongly supports integration of coronary physiology and intravascular imaging in PCI, whereas their role in coronary artery bypass grafting remains investigational.
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