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Published on: January 18, 2018
Stent thrombosis: an updated clinical overview from epidemiology to classification and management
Lucio Giuseppe Granata1, Marcello Marchetta2, Giulia Alagna3
1Cardiology Division, National Centre of Excellence Garibaldi Hospital, Garibaldi-Nesima Hospital, Catania, Sicily, Italy dr.granatacardiologo@gmail.com.
Insights
Stent thrombosis (ST) after coronary stent implantation remains a severe complication despite advances. Understanding its timing-based mechanisms is key to improving diagnosis and management strategies for better patient outcomes.
Area of Science:
- Cardiovascular Medicine
- Interventional Cardiology
- Biomaterials Science
Background:
- Coronary stent implantation is a cornerstone of percutaneous coronary intervention (PCI), significantly reducing vessel closure and restenosis.
- Despite advancements in drug-eluting stents and antiplatelet therapies, stent thrombosis (ST) persists as a critical complication with high mortality.
- ST presents diverse mechanisms depending on the timing of occurrence: intraprocedural, early, late, and very late phases.
Purpose of the Study:
- To review current definitions, epidemiology, and underlying mechanisms of stent thrombosis.
- To outline diagnostic pathways and contemporary therapeutic strategies for acute ST management.
- To summarize preventive measures, including imaging-guided implantation and optimized dual antiplatelet therapy (DAPT).
Main Methods:
- This narrative review synthesizes current literature and recent consensus recommendations.
- It integrates data on diagnostic modalities, particularly intravascular imaging like optical coherence tomography (OCT) and intravascular ultrasound (IVUS).
- The review examines therapeutic interventions and preventative strategies for ST.
Main Results:
- Early ST is often linked to procedural issues (e.g., underexpansion, malapposition) or inadequate DAPT.
- Late and very late ST can result from delayed healing, late-acquired malapposition, neoatherosclerosis, or hypersensitivity reactions (Kounis syndrome type III).
- Intravascular imaging is crucial for identifying ST mechanisms and guiding treatment; drug-coated balloons offer a metal-free option for select late presentations.
Conclusions:
- Effective management of ST requires a multi-faceted approach, including rapid reperfusion, mechanical optimization, and potent antithrombotic therapy.
- Prevention strategies emphasize precise stent implantation guided by intravascular imaging, individualized DAPT regimens, and rigorous control of cardiovascular risk factors.
- Continued research and adherence to updated guidelines are essential for mitigating the risks associated with coronary stenting.
Abstract:
Coronary stent implantation has revolutionised percutaneous coronary intervention (PCI), preventing vessel closure and reducing restenosis. Nonetheless, the permanent presence of an intracoronary endoprosthesis introduces two intrinsic major limitations: restenosis and stent thrombosis (ST). Although ST incidence has declined with last-generation drug-eluting stents, improved implantation technique and antiplatelet regimens, it remains a catastrophic event, typically presenting as ST-elevation myocardial infarction or sudden cardiac death, with persistently high early and late mortality. Standardised definitions classify ST by diagnostic certainty and timing from implantation, reflecting distinct underlying mechanisms across intraprocedural, early, late and very late phases. Early ST is most often driven by correctable procedural and pharmacological determinants, including underexpansion and malapposition, high thrombotic burden in acute coronary syndromes and premature discontinuation or inadequate effect, of dual antiplatelet therapy (DAPT). Late and very late ST are frequently related to delayed healing with uncovered struts, late-acquired malapposition and intrastent neoatherosclerosis or may involve hypersensitivity to stent components or allergy to external factors (Kounis syndrome type III). Intravascular imaging, particularly optical coherence tomography, complemented by intravascular ultrasound, is pivotal to identify the dominant mechanism and guide targeted therapy. Acute management relies on rapid reperfusion with PCI, mechanical optimisation and potent antithrombotic strategies; drug-coated balloon angioplasty is emerging as a mechanistically attractive option in selected late presentations to avoid additional metal. Prevention relies on imaging-guided implantation, individualised DAPT and strict risk-factor control. This narrative review summarises current definitions, epidemiology, mechanisms, diagnostic pathways and contemporary therapeutic and preventive strategies, integrating recent consensus recommendations.
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