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Directional coronary atherectomy: from therapeutic device to research tool in coronary artery disease
1Cattedra di Cardiologia, Libera Università, Roma. g.disciascio@unicampus.it
Insights
Directional coronary atherectomy (DCA) offers high procedural success for various coronary lesions. While effective for debulking, DCA has not shown benefits in reducing restenosis rates compared to angioplasty.
Area of Science:
- Cardiovascular Medicine
- Interventional Cardiology
- Percutaneous Coronary Intervention
Background:
- Directional coronary atherectomy (DCA) emerged in 1990 as a novel percutaneous revascularization technique.
- Initially used for simpler lesions, DCA's applications expanded to complex cases including saphenous vein grafts and bifurcation lesions.
Purpose of the Study:
- To review the evolution and efficacy of DCA in treating diverse coronary artery disease.
- To explore the histological insights gained from DCA-excised tissue and its implications for understanding plaque biology.
- To outline future research directions for atherectomy techniques.
Main Methods:
- Review of clinical outcomes and comparative studies of DCA versus coronary angioplasty.
- Analysis of histological findings from in vivo DCA tissue samples.
- Examination of studies defining optimal atherectomy techniques and the "debulking plus stenting" concept.
Main Results:
- DCA demonstrated high procedural (95%) and clinical (94%) success rates with low major complications (4.6%).
- Comparative studies showed better acute success rates for DCA but no significant reduction in restenosis.
- Histological studies provided insights into plaque characteristics, particularly in unstable angina.
Conclusions:
- DCA is an effective revascularization tool with a broad range of applications, especially for complex lesions.
- While improving acute outcomes, DCA's role in preventing restenosis requires further investigation.
- In vivo histological analysis of DCA specimens offers valuable research opportunities for coronary artery disease.
Abstract:
Directional coronary atherectomy (DCA) was introduced as a new percutaneous revascularization modality in 1990, and was initially applied to large vessels without tortuosity or calcification, with overall results including a 95% procedural success, 94% clinical success and 4.6% major complications (urgent bypass surgery in 3.8%, Q wave myocardial infarction in 1.7%, and hospital mortality in 0.3% of patients). In addition to its established efficacy for eccentric lesions, newer applications emerged such as treatment of saphenous vein grafts, thrombus-associated lesions, aorto-ostial lesions, failed or suboptional coronary angioplasty results, bifurcation lesions and use as a part of multi-vessel intervention. Comparative studies with coronary angioplasty such as CAVEAT I and II and CCAT showed better success rates with DCA vs coronary angioplasty, but failed to demonstrate benefit in restenosis rates. OARS and BOAT studies helped define optimal atherectomy techniques, which led to better acute angiographic results and to the "debulking plus stenting" concept. A spin-off of those clinical applications has been the opportunity to study the histology of tissue excised by DCA in vivo in different clinical settings. Such studies, investigating plaque ulceration, thrombosis and inflammation are reviewed, with special emphasis on new insights into unstable angina; the future of atherectomy research is also outlined with a categorization of various possible protocols to be applied utilizing coronary atherectomy specimens from live patients.