Transcatheter embolization stops upper or lower GI bleeding when endoscopy fails or isn't feasible — precisely blocking the bleeding artery while preserving the bowel's blood supply.
Gastrointestinal (GI) bleeding refers to bleeding anywhere along the digestive tract, from the oesophagus and stomach down to the rectum, and can range from slow, chronic blood loss to sudden, massive, life-threatening haemorrhage. Endoscopy — passing a camera down through the mouth or up through the rectum — is the first-line treatment for most GI bleeding, since it can often directly see and treat the bleeding point. Transcatheter arterial embolization becomes the treatment of choice specifically when endoscopy isn't enough: when it fails to control bleeding that's been identified, when the bleeding source can't be reached or clearly seen endoscopically, or when a patient is too unstable to safely undergo or wait for endoscopy.
The procedure works by identifying the specific artery feeding the bleeding point on angiography, then selectively blocking it with an embolic material — stopping blood flow to that point precisely, while preserving blood supply to the surrounding bowel through its rich network of collateral vessels.
From the oesophagus, stomach, or duodenum — most commonly a bleeding peptic ulcer.
From the small bowel or colon — diverticular disease, tumours, or angiodysplasia.
Used when endoscopic treatment fails, the source can't be reached, or the patient is too unstable.
A needle puncture is made in the wrist or groin artery under local anaesthesia with sedation.
A catheter is guided to the artery supplying the bleeding area, with contrast confirming the source.
Coils, particles, or glue block the bleeding vessel precisely.
A final angiogram confirms bleeding has stopped before monitoring begins.
The approach and some of the considerations differ somewhat depending on where the bleeding is coming from:
Upper GI bleeding — from the oesophagus, stomach, or duodenum, most commonly due to a bleeding peptic ulcer, but also seen with tumours, or as a complication following certain procedures. Embolization here is now well-established as the standard next step when endoscopic treatment fails or bleeding recurs, and is generally preferred over emergency surgery given its lower complication rate.
Lower GI bleeding — from the small bowel or colon, due to causes such as diverticular disease, tumours, inflammatory bowel disease, or abnormal blood vessels (angiodysplasia). Embolization here was historically approached more cautiously, out of concern that blocking blood flow to the bowel wall could cause tissue injury (bowel ischaemia). With modern, highly selective catheter techniques that target the bleeding vessel very precisely, this risk has been shown to be low, and embolization is now a well-accepted, effective option for lower GI bleeding as well.
In a patient with significant or ongoing GI bleeding, initial priorities are resuscitation — restoring blood volume and stabilising blood pressure — alongside identifying the likely source. CT angiography is frequently used as the first imaging test, since it can directly show active contrast leaking from the bleeding vessel (contrast extravasation) in real time, precisely locating the bleeding point and helping plan the embolization procedure that follows. Endoscopy, where feasible, also plays a central diagnostic role, and the choice between endoscopy first or imaging first is guided by how the patient is presenting and how stable they are.
Access: under local anaesthesia with sedation, a needle puncture is made in the wrist (radial) or groin (femoral) artery.
Angiography: a catheter is guided to the artery supplying the relevant part of the GI tract — commonly a branch of the coeliac axis for upper GI bleeding, or a branch of the mesenteric arteries for lower GI bleeding — and contrast dye is injected to look for active bleeding or other signs suggesting the bleeding source.
Superselective catheterisation: a fine microcatheter is advanced as precisely as possible into the specific small vessel responsible for the bleeding, minimising the amount of bowel that loses its blood supply.
Embolization: coils, particles, glue, or a gelatin-based agent are used to block the bleeding vessel, chosen according to the vessel's size, location, and the clinical situation.
Confirmation: a final angiogram confirms bleeding has stopped, and the puncture site is closed before the patient is returned for monitoring.
The procedure typically takes around one to two hours, and most patients are observed closely in hospital afterward, with the length of stay guided by their overall clinical condition rather than the procedure itself.
The main procedure-specific risk is bowel ischaemia — reduced blood supply to a segment of bowel wall following embolization — which is uncommon with modern, highly selective technique but is a recognised risk, particularly in the small bowel and colon, which is why precise, superselective catheterisation matters so much. Standard angiographic risks also apply, including bruising or bleeding at the access site and a reaction to the contrast dye used. Rebleeding can occur in a minority of patients after otherwise successful embolization, usually related to the extent of collateral blood supply feeding the original bleeding point, and can generally be managed with repeat embolization or, occasionally, surgery.
Compared with emergency surgery, embolization is associated with a shorter hospital stay, fewer major complications, and avoids an abdominal incision entirely, since the whole procedure is done through a needle puncture in the wrist or groin. Surgery remains necessary in a minority of cases — for instance, where embolization isn't technically possible, where it fails to control bleeding, or where there's another surgical reason to operate (such as a perforation) — which is why close, real-time coordination between the emergency, gastroenterology, surgical, and interventional radiology teams matters throughout an episode of significant GI bleeding.
GI bleeding embolization is frequently an emergency procedure, and outcomes depend on rapid access to angiography alongside precise, superselective technique that stops the bleeding while protecting the bowel's blood supply. This combination — speed and precision together — is why GI bleeding is best managed at a centre with round-the-clock interventional radiology availability and close, practised coordination with the gastroenterology and surgical teams managing the patient's overall care.
Usually, yes — endoscopy remains the first-line treatment for most GI bleeding. Embolization is used specifically when endoscopic treatment fails, can't reach or clearly identify the bleeding source, or isn't a safe option for an unstable patient.
Yes — modern, highly selective catheter techniques have made embolization a well-accepted, effective treatment for lower GI bleeding (small bowel and colon) as well as upper GI bleeding, with a low risk of affecting the surrounding bowel's blood supply.
Clinical success rates are high, generally in the range of 85% to 95% for stopping active bleeding, with a notably lower complication rate than emergency surgery for comparable cases.
It can, in a minority of patients, usually related to collateral blood vessels feeding the original bleeding point. Recurrent bleeding is generally managed with repeat embolization, and surgery is reserved for cases where this isn't successful.
Not always — surgery is still needed in a minority of cases where embolization isn't technically possible, doesn't control the bleeding, or where there's a separate surgical reason to operate. Most cases, however, are successfully managed without surgery.
This can be a medical emergency — call immediately, or book an urgent consultation with Dr. Giragani.