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Updated: May 5, 2026

Interventional Diagnostic Procedure: A Practical Guide for the Assessment of Coronary Vascular Function
Published on: March 15, 2022
Percutaneous Revascularization of Thrombotic and Calcified Coronary Lesions
Andrea Milzi1,2, Federico Simonetto3, Antonio Landi1,2
1Division of Cardiology, Cardiocentro Ticino Institute, Ente Ospedaliero Cantonale, CH-6900 Lugano, Switzerland.
Insights
Percutaneous coronary intervention (PCI) for complex lesions requires advanced imaging to understand thrombus and calcification. This improves stent outcomes and patient results by guiding device selection and optimization.
Area of Science:
- Cardiology
- Interventional Cardiology
- Medical Imaging
Background:
- Percutaneous coronary intervention (PCI) for thrombotic and heavily calcified lesions presents significant challenges.
- Difficulty in wiring, restoring flow, and implanting stents can lead to complications.
- Stent underexpansion and malapposition are major drivers of adverse events like restenosis and thrombosis.
Purpose of the Study:
- To review the prevalence, predictors, and outcomes of treating
- hard-rock
- thrombotic lesions with PCI.
- To highlight the critical role of imaging and physiological assessments in guiding these interventions.
- To provide an overview of novel technologies for managing complex coronary lesions.
Main Methods:
- Review of current evidence on imaging and physiological assessments in PCI for complex lesions.
- Focus on multimodal imaging for characterizing thrombi and calcification.
- Exploration of cutting-edge debulking and stent optimization technologies.
Main Results:
- Multimodal imaging is crucial for characterizing high-risk lesions.
- Understanding thrombus formation and calcium distribution aids in optimal revascularization strategy selection.
- Advanced imaging and planning improve procedural success and long-term clinical outcomes.
Conclusions:
- Thorough lesion characterization using imaging is essential for successful PCI in complex thrombotic and calcified lesions.
- Careful patient selection and procedural planning with advanced technologies can mitigate complications.
- Optimizing stent implantation based on imaging guidance improves clinical results.
Abstract:
Percutaneous coronary intervention (PCI) for thrombotic and heavily calcified coronary artery lesions and occlusions is often hampered by difficulty in wiring the occlusions, restoring antegrade flow, and proceeding to successful stent implantation. Characterization of dynamic anatomical features such as thrombi and the calcium distribution is key to prevent periprocedural complications and long-term adverse events, which are mainly driven by stent underexpansion and malapposition and may prompt in-stent restenosis or stent thrombosis. Therefore, multimodal imaging is a critical step during PCI to better characterize these high-risk lesions and select those in which careful preparation with debulking devices is needed or to guide stent optimization with the aim of improving procedural and long-term clinical outcomes. Hence, obtaining a better understanding of the underlying cause of thrombus formation, imaging the calcium distribution, and thorough planning remain crucial steps in selecting the optimal revascularization strategy for an individual patient. In this review, we summarize current evidence about the prevalence, predictors, and clinical outcomes of "hard-rock" thrombotic lesions treated by PCI, focusing on the value of imaging and physiological assessments performed to guide interventions. Furthermore, we provide an overview of cutting-edge technologies with the aim of facilitating the use of such devices according to specific procedural features.
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