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Restenosis after directional coronary atherectomy.
T Hinohara1, G C Robertson, M R Selmon
1Pacific Foundation for Cardiovascular Research, Redwood City, California 94062.
Journal of the American College of Cardiology
|September 1, 1992
Summary
Restenosis after directional coronary atherectomy affects 42% of patients, particularly in saphenous vein grafts. Factors like lesion length and device size influence restenosis risk.
Area of Science:
- Cardiovascular Medicine
- Interventional Cardiology
- Medical Device Technology
Background:
- Directional coronary atherectomy (DCA) is a recognized treatment for obstructive coronary artery disease.
- Limited data exists on restenosis rates and associated risk factors following DCA procedures.
Purpose of the Study:
- To determine the incidence of restenosis after successful DCA.
- To identify patient and lesion-specific risk factors contributing to restenosis.
Main Methods:
- Prospective follow-up of 289 patients (332 lesions) treated with DCA (1986-1989).
- Clinical follow-up (98%) and angiographic follow-up (82%) at ~6 months.
- Quantitative angiographic analysis defining restenosis as >50% stenosis.
Main Results:
- 42% of patients experienced angiographic restenosis.
- Higher restenosis rates observed in saphenous vein grafts (53-82%) versus native arteries (31%).
- Risk factors for restenosis included saphenous vein graft use, hypertension, longer lesions, smaller vessel diameter, noncalcified lesions, and smaller device size (6F).
Conclusions:
- Restenosis remains a significant limitation of DCA.
- Favorable outcomes may be associated with larger vessels, shorter lesions, and larger devices (7F).