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Radiation Oncology |
1 From the Departments of Angiology (R.M.W., R.A., M.H., R.B., E.M.), Radiotherapy and Radiobiology (B.P., C.F., R.P.), and Cardiology (M.G.), University of Vienna General Hospital, Währinger Gürtel 18-20, A-1097 Vienna, Austria. Received November 28, 2000; revision requested January 11, 2001; revision received March 19; accepted April 9. Address correspondence to E.M. (e-mail: erich.minar@akh-wien.ac.at).
PURPOSE: To evaluate the feasibility, safety, and effectiveness of endovascular brachytherapy for the prevention of restenosis after long-segment femoropopliteal percutaneous transluminal angioplasty (PTA) and stent implantation.
MATERIALS AND METHODS: Thirty-three patients (23 men, 10 women; mean age, 66 years) with femoropopliteal lesions (mean treated length, 17 cm; range, 430 cm) underwent PTA and stent implantation followed by brachytherapy with a centering catheter. A dose of 14 Gy was delivered to the adventitia by using an iridium 192 source. Long-term pharmacotherapy with acetylsalicylic acid was combined with clopidogrel for 1 month. Follow-up examinations included measurement of the ankle-brachial index, color-coded duplex ultrasonography, and angiography.
RESULTS: The overall 6-month recurrence rate was 30% (10 of 33 arteries). Seven patients developed sudden late thrombotic occlusion of the segment with the stent 3.56 months after stent implantation. Considering the overall results after successful local thrombolysis in six of these seven patients, only four (12%) of 33 arteries with a stent had in-stent restenosis caused by neointimal hyperplasia.
CONCLUSION: The study results are promising concerning the possibility of reducing in-stent restenosis by means of brachytherapy after long-segment femoropopliteal placement of stents. The high incidence of late thrombotic occlusion requires optimization of the antithrombotic regimen.
Index terms: Arteries, stenosis or obstruction, 92.72 Arteries, transluminal angioplasty, 92.1286 Iridium, radioactive Stents and prostheses, 92.1286 Stents and prostheses, radiation, 92.1286
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