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- W2060170468 abstract "<h2>Abstract</h2> Restenosis is a serious problem limiting the long-term efficacy of percutaneous transluminal coronary angioplasty. Neointimal smooth muscle proliferation is the major process underlying restenosis. The objective of this study was to investigate the effects of external irradiation on neointimal hyperplasia following balloon angioplasty. We examined the ability of external X-ray irradiation to inhibit intimal hyperplasia following balloon angioplasty in a non-atherosclerotic rabbit model. Baseline quantitative angiography (day 0) was performed in all rabbits and balloon angioplasty was performed in the right (control) and the left iliac arteries. Five days after balloon angioplasty, the left iliac in each rabbit was irradiated with either 600 cGy (<i>n</i> = 5) or 1200 cGy (<i>n</i> = 5). Twenty-eight days following angioplasty final angiography was performed. All rabbits were sacrificed, and the iliac arteries were fixed for morphometric measurements. Comparison of baseline and final angiographic measurements revealed a significant decrease in average and minimum lumen dimensions for both control and irradiated segments (600 and 1200 cGy) [average: <i>P</i> (baseline vs. final) 0.008 (control), 0.001 (600 cGy); 0.05 (control), 0.007 (1200 cGy)]. Morphometric analysis showed no difference in neointimal cross-sectional area between control (0.29 ± 0.05 mm<sup>2</sup>) and 600 cGy irradiated segments (0.32 ± 0.07 mm<sup>2</sup>) (<i>P</i> = 0.82). However, there was a statistically significant reduction in neointimal hyperplasia in the 1200 cGy irradiated segments (0.09 ± 0.02 mm<sup>2</sup>) compared to control (0.23 ± 0.06 mm<sup>2</sup>, <i>P</i> = 0.02). There was no significant difference in medial cross-sectional area between control and irradiated segments (600 and 1200 cGy). We conclude that in this model, external beam X-ray irradiation (1200 cGy) was successful in reducing neointimal proliferation after balloon angioplasty. Whether or not this approach can be used successfully to inhibit restenosis in the clinical setting requires further investigation." @default.
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- W2060170468 date "1994-05-01" @default.
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- W2060170468 title "External beam irradiation inhibits neointimal hyperplasia following balloon angioplasty" @default.
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- W2060170468 doi "https://doi.org/10.1016/0167-5273(94)90283-6" @default.
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