Abstract:
PURPOSE:Liquid sources of radiation delivered in angioplasty balloons may be a convenient self-centering device used for prevention of in-stent restenosis. To test the effectiveness of this method an intravascular brachytherapy study was performed using 32P liquid sources in an animal model. METHODS:The radial dose distribution around angioplasty balloons filled with solutions of Na 2H 32PO 4 was calibrated by thermoluminescence dosimetry. The animal experiments were performed in rabbits with induced hypercholesterolemia. The balloons containing 32P were introduced into iliac arteries immediately after stent implantation. Estimated 7-49 Gy doses required 30-100 min irradiations. Radiation effects were evaluated by comparing the thickness of various components of the artery wall. RESULTS:Doses of 7, 12, 16 or 49 Gy on the internal artery surface required 30-100 min of irradiation. The dose of 49 Gy at "zero" distance corresponding to 16 Gy at 1.0 mm from the balloon surface reduced hypertrophy in every layer of the arterial wall: in the intima the cross-sectional areas were 0.13 versus 0.91 mm 2, in the media were 0.5 versus 0.46 mm 2 and in the adventitia were 0.04 versus 0.3 mm 2 (p <0.05). A dose of 7 Gy at the balloon surface produced adverse irradiation effects: the intimal area of the artery was 2.087 versus 0.857 mm 2, the medial area was 0.59 versus 0.282 mm 2 and the adventitial area was 0.033 versus 0.209 mm 2 in treated and control arteries, respectively. CONCLUSION:Application of a 49 Gy irradiation dose to the internal arterial surface effectively prevented in-stent restenosis.
journal_name
Cardiovasc Intervent Radioljournal_title
Cardiovascular and interventional radiologyauthors
Wilczek K,Walichiewicz P,Petelenz B,Jache W,Jochem J,Tomasik A,Bilski P,Snietura M,Wodniecki Jdoi
10.1007/s00270-002-1879-zsubject
Has Abstractpub_date
2002-07-01 00:00:00pages
307-13issue
4eissn
0174-1551issn
1432-086Xjournal_volume
25pub_type
杂志文章abstract::The effect of percutaneous transluminal embolization (PTE) on the prognosis of renal cell carcinoma, depending on tumor stage, was retrospectively investigated on 303 patients. The life-table method was used for statistical comparison of survival rates of preoperatively or palliatively embolized patients with those of...
journal_title:Cardiovascular and interventional radiology
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journal_title:Cardiovascular and interventional radiology
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journal_title:Cardiovascular and interventional radiology
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