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Journal Article
Research Support, Non-U.S. Gov't
Intravascular ultrasound to discern device-specific effects and mechanisms of restenosis.
American Journal of Cardiology 1996 August 15
Restenosis continues to be the "Achilles heel" of transcatheter interventions. While attempts to reduce restenosis by inhibiting cellular proliferation through pharmacologic or mechanical means have been unsuccessful, stents, which inhibit acute recoil and chronic remodeling, have been shown convincingly to reduce restenosis in 2 randomized clinical trials. Intravascular ultrasound (IVUS) allows transmural, tomographic imaging of coronary arteries in humans in vivo to subdivide restenosis into the two basic underlying components: tissue proliferation and arterial remodeling. In studies performed at the Washington Hospital Center, in nonstented lesions 73% of late lumen loss was due to arterial remodeling (a decrease in arterial, or external elastic membrane cross-sectional area) and 27% was due to tissue growth (an increase in plaque plus media cross-sectional area). These findings were confirmed by 2 other studies: the Optimal Atherectomy Restenosis Study (OARS) and the Serial Ultrasound analysis of REstenosis (SURE) Trial. IVUS was also used to study the mechanisms by which stents reduce restenosis. Stents created a larger final lumen cross-sectional area and, for all practical purposes, abolished arterial remodeling to offset a stent-related increase in neointimal tissue accumulation. Neointimal hyperplasia is solely responsible for in-stent restenosis and therefore appears to be a pure model for studying strategies to limit tissue proliferation.
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