Peripheral hepatic arterial embolization with crosslinked collagen fibers

Area of Science:

• Interventional Radiology
• Vascular Surgery
• Hepatology

Background:

• Hepatic artery embolization is a critical intervention for various liver conditions.
• Assessing the safety and efficacy of novel embolic agents is crucial for clinical practice.

Purpose of the Study:

• To evaluate the safety and reversibility of hepatic artery embolization using a collagen-based agent (Angiostat) in a canine model.
• To characterize the vascular healing and functional recovery following embolization.

Main Methods:

• Mongrel dogs underwent flow-directed hepatic artery embolization with a crosslinked microfibrillar collagen preparation.
• Serial liver function tests and angiographic evaluations were performed.
• Histological analysis examined collagen deposition and vascular recanalization.

Main Results:

• Complete distal arterial occlusion was achieved, leading to transient liver function abnormalities.
• Angiographic and histological evidence showed collagen particles within 20-250 micron vessels.
• Vascular recanalization occurred over 3-4 months via endothelial cell migration and collagen removal.
• Normal hepatic vascular and tissue anatomy, along with function, were fully restored by three months post-embolization.
• Repeated embolizations were well tolerated.

Conclusions:

• Hepatic artery embolization with collagen is a safe and reversible procedure in canines.
• The embolic agent facilitates complete restoration of hepatic vascular and tissue integrity.
• This collagen preparation shows promise as an effective embolic agent with a favorable healing profile.