In situ beta-irradiation of a brain arteriovenous malformation model.

Abstract:

BACKGROUND AND PURPOSE:The treatment of large brain arteriovenous malformations (BAVMs) is challenging, and embolization alone is seldom curative. The study goal is to enhance the efficacy of arteriovenous malformation embolization by adding a beta-emitting isotope to the embolic agent. METHODS:The pig rete mirabile was used as a BAVM model. The body distribution of radioactivity was evaluated after selective rete injection of N-butyl,2-cyanoacrylate mixed with (131)I-lipiodol in 8 animals using immediate whole body gamma-scintigraphy. Activities within the whole rete mirabile and selected tissue samples were quantified with a gamma counter immediately after sacrifice. Two pigs were submitted to serial gamma-scintigraphies for 6 weeks to detect delayed isotope leaching. Long-term effects of in situ irradiation were evaluated using a mixture of 188Re/N-butyl,2-cyanoacrylate in 8 pigs. In 1 animal, autoradiography was performed to evaluate local rete mirabile distribution of the radioactivity. Seven pigs were injected with 188Re/glue in 1 rete mirabile and with glue only on the opposite side, and the degree of vascular occlusion of both sides was compared on histology at 2 (n=2) or 6 months (n=5). RESULTS:There was negligible activity outside the target. Radiation caused occlusion of vessels unreached by the glue itself but in the vicinity of the radioactive source in 5 of 7 rete mirabile. CONCLUSIONS:Selective deposition of a beta-emitter inside a BAVM model may be achieved by current embolization techniques. The adjunct use of an isotope may increase the efficacy of embolization.

journal_name

Stroke

journal_title

Stroke

authors

Roy D,Soucy JP,Hartman NG,Janicki C,Weill A,Guilbert F,Papineau K,Raymond J

doi

10.1161/01.STR.0000185673.73381.4c

subject

Has Abstract

pub_date

2005-11-01 00:00:00

pages

2475-8

issue

11

eissn

0039-2499

issn

1524-4628

pii

01.STR.0000185673.73381.4c

journal_volume

36

pub_type

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