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(Circulation. 1995;91:1533-1539.)
© 1995 American Heart Association, Inc.
Articles |
Endovascular Low-Dose Irradiation Inhibits Neointima Formation After Coronary Artery Balloon Injury in Swine
A Possible Role for Radiation Therapy in Restenosis Prevention
From the Andreas Gruentzig Cardiovascular Center, Department of Medicine, Division of Cardiology (R.W., K.A.R., G.D.C., S.B.K. III), Department of Radiation Oncology (I.R.C.), and Department of Pathology (M.B.G.), Emory University School of Medicine, Atlanta, Ga.
Correspondence to Spencer B. King III, MD, Andreas Gruentzig Cardiovascular Center, F606 Emory University Hospital, 1364 Clifton Rd NE, Atlanta, GA 30322.
Background Restenosis after percutaneous transluminal coronary angioplasty remains a major limitation of the long-term success of this procedure. Restenosis is a form of wound healing. Low-dose ionizing radiation has been effective in inhibiting exuberant wound healing responses in a variety of clinical situations.
Methods and Results Vascular neointimal lesions resembling human restenosis were created in the coronary arteries of normal pigs by overstretch balloon angioplasty injury. To test the effect of low-dose endovascular gamma radiation on lesion formation, a high-activity 192Ir source was introduced into one of the injured arteries in each animal and left in place for a period sufficient to deliver one of three doses: 350, 700, or 1400 cGy. To test potential benefits of delayed irradiation, 700 cGy was given in another group 2 days after injury. Animals were killed 14 days after balloon injury and the coronary vasculature was pressure-perfusion fixed. To test the late effect and safety of endovascular low-dose irradiation, 700 or 1400 cGy was given in miniswine coronary arteries after injury as well as in noninjured carotid arteries; this group was followed up for 6 months. Tissue sections were measured by computer-assisted planimetry. All arteries treated with radiation demonstrated significantly decreased neointima formation compared with control arteries. The ratio of intimal area–to–medial fracture length (IA/FL) was inversely correlated with the different radiation doses: control, 0.59; 350 cGy, 0.38; 700 cGy, 0.42; and 1400 cGy, 0.17 (r=-0.75, P<.0001). Delay of 700-cGy irradiation for 2 days after injury significantly decreased neointima formation compared with the same dose given immediately after injury. Analysis of long-term specimens showed reduction of IA/FL in the arteries irradiated with 700 cGy (0.3, P=.009) and 1400 cGy (0.31, P=.001) compared with control arteries (0.50). There was no excess fibrosis in the media, adventitia, or perivascular space of the coronary arteries or adjacent myocardium in pigs that received radiation compared with control animals.
Conclusions Low-dose intracoronary irradiation delivered to the site of coronary arterial overstretch balloon injury in pigs inhibited subsequent intimal thickening (hyperplasia). A dose-response relationship was demonstrated, and delay of treatment for 48 hours appeared to augment the inhibitory effect. Six months of follow-up without fibrosis or arteriosclerosis demonstrated the durability of the beneficial effect in the treated group. These data suggest that intracoronary irradiation therapy may aid in preventing clinical restenosis.
Key Words: restenosis • angioplasty • arteries • radiation
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