A liquid embolic agent is a flowable substance that interventional physicians can direct through a thin catheter into an abnormal blood vessel, where it solidifies and blocks blood flow. This category of embolic material is used in a procedure called embolization, which is designed to reduce or stop blood supply to a targeted area. Understanding the basics of how liquid embolics work can help patients feel more prepared for conversations with their care team.
How Does a Liquid Embolic Agent Work?
During embolization, a physician threads a microcatheter through the blood vessels, usually starting from a small access point in the wrist or groin, until the catheter tip reaches the target vessel. The liquid embolic agent is then injected through the catheter.
Once the liquid contacts blood or bodily fluids, it undergoes a physical change—often precipitating from a liquid into a soft, solid mass—that occludes the vessel. This process is guided continuously using imaging technology such as fluoroscopy, which allows the physician to visualize the agent as it fills the vessel in real time.
Why Are Liquid Embolics Used?
Liquid embolic agents are often selected for vascular abnormalities where a physician needs the material to flow into small, complex, or tortuous vessel networks. Common categories of use include:
- Arteriovenous malformations (AVMs): tangled connections between arteries and veins that bypass normal capillary networks.
- Hypervascular tumors: growths with an unusually rich blood supply that may be embolized before surgical removal.
- Certain types of abnormal bleeding: where a physician determines that vessel occlusion may help control blood loss.
Because liquid embolics can conform to irregular vessel shapes and penetrate distally into a vascular network, they are sometimes favored over other embolic materials in specific clinical scenarios, as determined by the treating physician.
What Makes Liquid Embolics Different From Other Embolic Materials?
Embolization can be performed using several categories of materials, including coils, plugs, particles, and liquid agents. Liquid embolic agents are distinct because they are delivered as a flowable substance rather than a pre-shaped device.
Many liquid embolic systems also contain a radiopaque component, such as suspended metal powder, so the physician can track the agent's distribution under imaging. INVAMED's LIBRO EVOH liquid embolic, for example, incorporates tantalum for this purpose. The choice between liquid embolics, coils, particles, or plugs depends on vessel anatomy, the clinical goal, and the physician's assessment.
Frequently Asked Questions
Is a liquid embolic agent the same as a coil?
No. Coils are pre-shaped metal devices that a physician deploys to physically occlude a vessel, while liquid embolic agents are flowable substances injected through a catheter that solidify inside the vessel. Both are categories of embolic materials, and a physician determines which is appropriate for a given anatomy and condition.
What conditions might involve a liquid embolic agent?
Liquid embolics are commonly discussed in the context of arteriovenous malformations and hypervascular tumors, among other vascular conditions. Suitability for any embolization approach is determined by a qualified physician based on individual imaging and clinical findings.
Is embolization with a liquid agent reversible?
Embolization with a liquid embolic agent is generally intended to create a durable vessel occlusion. As with any interventional procedure, risks, benefits, and permanence should be discussed thoroughly with the treating physician before the procedure.
Related INVAMED Resources
Medical Disclaimer: This article is provided for general informational and educational purposes only and does not constitute medical advice, diagnosis, or treatment recommendation. It is not a substitute for consultation with a qualified healthcare professional. Product indications, availability, and regulatory status vary by country. Always refer to the official Instructions for Use (IFU) and consult a licensed physician for guidance specific to your situation. INVAMED devices are intended for use by trained healthcare professionals.