title: Endovascular gamma irradiation of femoropopliteal de novo stenoses immediately after PTA: interim results of prospective randomized controlled trial.
abstract: OBJECTIVE
  To report an interim analysis of whether centered endovascular irradiation with the iridium 192 ((192)Ir) source immediately after percutaneous transluminal angioplasty (PTA) of de novo femoropopliteal stenoses lowers the restenosis rate.
  
  
  METHODS
  Thirty patients undergoing PTA to treat femoropopliteal stenoses were randomized for prophylaxis against restenosis with centered endovascular irradiation with a (192)Ir source (a dose of 14 Gy 2 mm deep to the vessel wall, irradiation group) or no irradiation (control group). Angiographic follow-up was available for 22 patients at 6 months (irradiation group, n = 10) and 12 patients at 12 months (irradiation group, n = 6). Duplex sonography, treadmill testing, and interviews were performed the day before and the day after PTA and after 1, 3, 6, 9, and 12 months. Results of angiography, duplex sonography, treadmill testing, and interviews were evaluated with a t test and multivariate analysis of variance (clinical characteristics, chi(2) test).
  
  
  RESULTS
  Baseline characteristics were comparable in the two groups. Interim analysis of the 6-month follow-up data revealed a trend toward a significantly lower restenosis rate in the irradiation group. The change in the degree of stenosis compared with that after PTA was -14.7% +/- 20.8 (mean +/- SD) in the irradiation group versus 37.7% +/- 27.3 in the control group (P =.001) and became even more marked at 12 months (-9.5% +/- 34.5 vs 45.5% +/- 40.7 [P =.03], respectively). The follow-up results of treadmill testing and interviews showed a nonsignificant benefit for the irradiation group. One thromboembolic complication occurred during irradiation. No side effects were observed during follow-up.
  
  
  CONCLUSIONS
  Endovascular irradiation with a centered (192)Ir source immediately after PTA of de novo femoropopliteal stenoses reduces the restenosis rate.
authors.affiliation: Department of Radiology, University of Cologne, Joseph-Stelzmann-Strasse, D-50924 Cologne, Germany. karsten.krueger@uni-koeln.de
authors.forename: Karsten
authors.initials: K
authors.lastname: Krueger
authors.forename: Peter
authors.initials: P
authors.lastname: Landwehr
authors.forename: Mark
authors.initials: M
authors.lastname: Bendel
authors.forename: Monika
authors.initials: M
authors.lastname: Nolte
authors.forename: Hartmut
authors.initials: H
authors.lastname: Stuetzer
authors.forename: Rudolf
authors.initials: R
authors.lastname: Bongartz
authors.forename: Markus
authors.initials: M
authors.lastname: Zaehringer
authors.forename: Guido
authors.initials: G
authors.lastname: Winnekendonk
authors.forename: Axel
authors.initials: A
authors.lastname: Gossmann
authors.forename: Rolf-Peter
authors.initials: RP
authors.lastname: Mueller
authors.forename: Klaus
authors.initials: K
authors.lastname: Lackner
mesh_terms: D015901:Angiography, Digital Subtraction; D000800:Angioplasty, Balloon; D001157:Arterial Occlusive Diseases / Q000175:diagnosis / Q000532:radiotherapy / Q000628:therapy; D001161:Arteriosclerosis / Q000175:diagnosis / Q000532:radiotherapy / Q000628:therapy*; D001918:Brachytherapy; D003131:Combined Modality Therapy; D005080:Exercise Test; D005260:Female; D005263:Femoral Artery; D006801:Humans; D007496:Iridium Radioisotopes / Q000627:therapeutic use; D008297:Male; D008875:Middle Aged; D011150:Popliteal Artery; D011446:Prospective Studies; D012008:Recurrence; D018615:Ultrasonography, Doppler, Color
chemical_list: D007496:Iridium Radioisotopes