New occlusive agent for therapeutic embolization tested in dogs

A new occlusive agent, Vilan 500, was used to embolize the arterial bed of the kidney in 12 dogs. This polyvinyl acetate, alcohol-soluble agent becomes gelantinous on contact with an aqueous environment and its low viscosity makes this material well suited for application through small-caliber catheters. Complete arterial occlusion of the embolized kidneys was observed in all animals. On histologic examination of tissue 4-6 weeks after the procedure, changes were seen such as shrinkage through fibrosis, diffuse necrosis and atrophic parenchyma. No signs of recanalization of the embolized artery or functional collateral circulation were noted in any dog.