Gastrointestinal bleeding can range from slow, chronic blood loss to sudden, life-threatening hemorrhage requiring urgent intervention. When endoscopic techniques cannot control active bleeding, or when the bleeding source is not accessible endoscopically, interventional radiology offers a catheter-based option: transcatheter embolization. Understanding how GI bleeding embolization works, and where it fits within emergency care, helps explain why interventional radiology has become an essential partner in managing this condition.
Why Is Embolization Used for GI Bleeding?
Endoscopy remains the first-line approach for diagnosing and often treating gastrointestinal bleeding, but certain bleeding sources are difficult to reach or control this way — such as bleeding deep in the small bowel, bleeding that recurs after endoscopic treatment, or bleeding in patients too unstable for endoscopic sedation. In these situations, angiography and embolization offer a way to identify the specific bleeding artery and stop hemorrhage directly at its vascular source, often without the need for open surgery.
What Does the Procedure Involve?
GI bleeding embolization begins with angiography, in which contrast dye is injected through a catheter positioned in the arterial system supplying the gastrointestinal tract, allowing the interventional radiologist to identify active extravasation (leakage of contrast indicating an active bleeding point) or other signs suggesting the bleeding source. Once identified, a microcatheter is advanced as selectively as possible toward the bleeding vessel, and embolic material is deployed to occlude it. Because emergency presentations do not allow for extensive advance planning, this procedure is often performed under significant time pressure in a hemodynamically unstable patient.
Why Does Superselective Technique Matter So Much Here?
The gastrointestinal tract has a rich network of overlapping blood supply, particularly through arcades of collateral vessels, which means that embolizing too proximal a point in the arterial tree risks compromising blood flow to a larger segment of bowel than intended — potentially causing bowel ischemia. Superselective embolization, in which the microcatheter is navigated as close as possible to the actual bleeding point before embolic material is deployed, is generally considered important for minimizing this risk while still achieving effective hemostasis (bleeding control).
What Embolic Materials Are Typically Used?
Embolic material selection depends on the specific vessel and clinical scenario, but coils are commonly used for GI bleeding embolization because of the precision they allow in occluding a very focal segment of vessel near the bleeding point. In some cases, other embolic agents may be used depending on the vessel size and flow characteristics. The goal across approaches is the same: achieve durable control of the bleeding point while preserving blood flow to as much surrounding bowel tissue as possible.
What Happens After the Procedure?
Patients treated with embolization for GI bleeding are generally monitored closely afterward for signs of rebleeding, as well as for symptoms that could suggest bowel ischemia from non-target vessel involvement, such as new or worsening abdominal pain. Given that GI bleeding embolization is frequently performed in an emergency or unstable clinical context, ongoing critical care management of the underlying cause and any associated blood loss remains an essential part of the overall treatment plan, coordinated by the full care team.
Microcatheters for Superselective Delivery
Effective GI bleeding embolization depends on microcatheters capable of navigating deep into small, tortuous mesenteric branches to achieve superselective positioning near the bleeding point. INVAMED manufactures the MicroDELIVERY Embolization Catheter, designed with a composite variable-stiffness shaft and hydrophilic distal coating intended for precise embolic agent delivery to small and distal vascular territories with minimal reflux. Further specifications are available on the MicroDELIVERY Embolization Catheter product page. Availability and indications vary by country, and the Instructions for Use (IFU) should always be consulted.
Device availability and regulatory status vary by country. Please contact INVAMED or your authorized local distributor for current regulatory information applicable to your region.