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[Embolism prevention during interventional treatment of aortocoronary bypass stenoses]
1Medizinische Klinik Kardiologie Krankenhaus Siegburg GmbH Ringstrasse 49 53721 Siegburg, Germany. RMueller@Krankenhaus-Siegburg.de
Insights
No-reflow complication after saphenous vein graft intervention is unpredictable. Mechanical devices show promise in preventing distal embolization and improving clinical outcomes.
Area of Science:
- Cardiovascular Interventions
- Medical Device Technology
Context:
- No-reflow is a significant complication following percutaneous intervention in saphenous vein grafts.
- Current treatments including pharmacological agents and alternative techniques have not improved outcomes.
- Mechanisms include plaque embolism, vasoconstriction, and thrombosis, leading to poor distal perfusion.
Purpose:
- To review the development and application of mechanical devices for preventing distal embolization during percutaneous interventions.
- To evaluate the efficacy of existing and emerging distal protection devices.
Summary:
- Mechanical devices, categorized as occlusive balloons and filtering systems, are being developed to mitigate no-reflow.
- The PercuSurge GuardWire (occlusive balloon) has demonstrated success in preventing embolization and improving outcomes, as shown in the SAFER trial.
- Second-generation filter devices are under investigation, offering preserved blood flow and precise stent placement.
Impact:
- Mechanical distal protection devices represent a significant advancement in managing no-reflow complications.
- These devices have the potential to improve clinical outcomes in saphenous vein graft interventions.
- Further investigation into broader applications, including carotid stenting and acute coronary syndromes, is warranted.
Abstract:
No-reflow is an unpredictable complication after percutaneous intervention in saphenous vein grafts. Plaque embolism, vasoconstriction and thrombosis are mechanisms that lead to poor distal run-off. Treatments with alternative techniques like DCA, TEC and ELCA as well as phamacological attempts like GP IIb/IIIA inhibitors, vasodilators and calcium-channel blockers do not improve outcome. This is the rationale for the development of mechanical devices to prevent distal embolization. Two concepts of distal protection devices are currently realized: occlusive balloon and filtering devices. The largest experience comes from the PercuSurge GuardWire, an occlusive balloon device. The recently presented data from the SAFER trial showed a significant prevention of distal embolization and improvement in clinical outcome. The second generation of filter devices is under investigation; the advantages of these systems are the preservation of blood flow and precise angiography-guided stent positioning. Another issue of investigation is a broader use of protection devices in carotid stenting, and in interventions in acute MI and acute coronary syndromes.