title: Prevention of recurrent central venous stenosis using endovascular irradiation following stent placement in hemodialysis patients.
abstract: This study was done to evaluate the outcome after brachytherapy (BT) given to prevent restenosis after stent insertion for central venous stenosis in patients with ipsilateral hemodialysis arteriovenous fistulas (AVF). Angioplasty and stenting were performed on 9 primary central venous stenoses in 8 patients with AVF followed by BT, delivering Iridium-192 radiation using an afterloading technique. BT was also administered to three patients with five recurrent stenoses at the stent margins. There was no residual stenosis after angioplasty and stenting. Venographic follow-up (77-644 days, mean 272 days) showed no restenosis in seven primary stenoses. New strictures (45%-100%) developed at the stent margin in six veins (five patients). Angioplasty or stenting was performed for five margin stenoses in three patients, followed by a second BT. Residual stenosis before BT was 0-30%. In our venographic follow-up (140-329 days, mean 215 days), three restenoses occurred (35%-100%). All progressed to complete occlusion on later venographic follow-up irrespective of whether BT was given to the stent margin or not. The mean primary and assisted primary patency of the central veins were 359 days and 639 days, respectively. Endovascular irradiation with a noncentering source does not prolong the patency after angioplasty and stenting of central venous stenosis in hemodialysis patients.
authors.affiliation: Department of Radiology and Imaging, Queen Elizabeth Hospital, Kowloon, Hong Kong.
authors.forename: P C
authors.initials: PC
authors.lastname: Kwok
authors.forename: K M
authors.initials: KM
authors.lastname: Wong
authors.forename: R K
authors.initials: RK
authors.lastname: Ngan
authors.forename: S C
authors.initials: SC
authors.lastname: Chan
authors.forename: W K
authors.initials: WK
authors.lastname: Wong
authors.forename: K Y
authors.initials: KY
authors.lastname: Wong
authors.forename: A K
authors.initials: AK
authors.lastname: Wong
authors.forename: K F
authors.initials: KF
authors.lastname: Chau
authors.forename: C S
authors.initials: CS
authors.lastname: Li
mesh_terms: D000328:Adult; D000368:Aged; D001132:Arm / Q000098:blood supply / Q000000981:diagnostic imaging; D001164:Arteriovenous Fistula / Q000150:complications / Q000628:therapy; D019917:Blood Vessel Prosthesis Implantation; D016121:Brachiocephalic Veins / Q000002:abnormalities / Q000000981:diagnostic imaging; D001918:Brachytherapy; D002405:Catheterization, Central Venous; D005260:Female; D005500:Follow-Up Studies; D006083:Graft Occlusion, Vascular / Q000209:etiology / Q000517:prevention & control* / Q000532:radiotherapy*; D006801:Humans; D007496:Iridium Radioisotopes / Q000627:therapeutic use; D008297:Male; D008875:Middle Aged; D010690:Phlebography; D012008:Recurrence; D006435:Renal Dialysis; D015607:Stents; D013350:Subclavian Vein / Q000002:abnormalities / Q000000981:diagnostic imaging; D013997:Time Factors; D016896:Treatment Outcome; D014654:Vascular Patency / Q000502:physiology / Q000528:radiation effects; D020246:Venous Thrombosis / Q000209:etiology / Q000532:radiotherapy
chemical_list: D007496:Iridium Radioisotopes