Effectiveness of endovascular embolization with a collagen-based embolic agent (Marsembol) in an animal model.
OBJECTIVE
To investigate in a porcine experimental model the effectiveness, tissue penetration, and histologic impact of renal artery embolization with a collagen-based nonadhesive embolic agent, marsembol.


METHODS
Fifteen pigs underwent embolization of one interlobular artery of the renal artery with collagen-resorcinol gel emulsified with Lipiodol and further polymerized with glutaraldehyde-formaldehyde mixture. Angiograms were obtained before, during, and after the procedure. Animals were euthanized at day 0 (n = 3), 1 week (n = 3), or 3 months (n = 7), and flat-panel three-dimensional rotational radiologic images of the kidneys were obtained. Arterial, medullary, and cortical samples were taken for histologic and scanning electron microscopic investigations.


RESULTS
Fifteen interlobular renal arteries were successfully embolized by delivering 1.7 mL + or - 0.2 of the embolic agent. All the embolized arteries remained occluded at 3 months, leading to a major atrophy of the embolized portions of the kidneys. Imaging and histologic findings show that the embolic agent provided a distal vessel occlusion and entirely filled the lumen of the arteries up to the glomerular tufts. The homogeneous plug formed by the embolic agent induces very few inflammatory responses. The regenerative tubular processes were arrested at 3 months.


CONCLUSIONS
The collagen-based embolic agent described here has the properties required to perform embolization. These specific properties lead to very distal vessel embolization. The embolic agent is effective at 3 months in renal embolization.
Vidal
Vincent
V
School of Medicine, Laboratory of Physiopathology and Vascular Therapeutics, Hôpital La Timone, 27 boulevard Jean Moulin, 13385 Marseille cedex 5, France. vincent.vidal@ap-hm.fr
Rolland
Pierre-Henri
PH
Daniel
Laurent
L
Moulin
Guy
G
Bartoli
Jean-Michel
JM
Levrier
Olivier
O
D000818:Animals; D001284:Atrophy; D003094:Collagen / Q000008:administration & dosage* / Q000737:chemistry; D004338:Drug Combinations; D004621:Embolization, Therapeutic / Q000379:methods*; D004998:Ethiodized Oil / Q000008:administration & dosage; D005557:Formaldehyde / Q000008:administration & dosage*; D005780:Gelatin / Q000008:administration & dosage*; D005782:Gels; D005976:Glutaral / Q000008:administration & dosage*; D021621:Imaging, Three-Dimensional; D007668:Kidney / Q000098:blood supply* / Q000000981:diagnostic imaging / Q000648:ultrastructure; D008855:Microscopy, Electron, Scanning; D023421:Models, Animal; D011859:Radiography; D012077:Renal Artery / Q000000981:diagnostic imaging; D012118:Resorcinols / Q000008:administration & dosage*; D013552:Swine; D013997:Time Factors; D014014:Tissue Adhesives / Q000008:administration & dosage*
D004338:Drug Combinations; D005782:Gels; D012118:Resorcinols; D014014:Tissue Adhesives; C083703:gelatin-resorcin-formaldehyde-glutaraldehyde adhesive; D005557:Formaldehyde; D004998:Ethiodized Oil; D005780:Gelatin; D003094:Collagen; D005976:Glutaral