Endoscopic Digestive Stenting

What Is Digestive Stenting

Digestive stenting is an endoscopic procedure in which a tubular prosthesis (stent) is placed inside a narrowed or obstructed segment of the gastrointestinal tract or biliary system to restore the passage of food, fluids, or bile. Stents serve as internal scaffolds that hold open a stricture caused by tumors, inflammation, or surgical complications. The procedure is minimally invasive, performed through an endoscope without the need for open surgery, and provides rapid relief of symptoms such as difficulty swallowing, vomiting, jaundice, or bowel obstruction.

Types of Stents

By Location

• Esophageal stents: Placed in the esophagus to relieve swallowing difficulty (dysphagia) caused by esophageal cancer, external compression, or post-surgical strictures. They are also used to seal esophageal perforations or fistulas.
• Biliary stents: Inserted into the bile duct during ERCP to relieve obstructive jaundice caused by biliary strictures, bile duct stones, or tumors of the bile duct, pancreatic head, or gallbladder.
• Duodenal stents: Placed in the duodenum or proximal jejunum to bypass gastric outlet obstruction caused by pancreatic cancer, gastric cancer, or other periampullary malignancies.
• Colonic and rectal stents: Used to relieve large bowel obstruction caused by colorectal cancer, either as a definitive palliative measure or as a bridge to surgery — allowing bowel decompression before a planned elective operation.

By Material

• Plastic stents: Inexpensive and easy to place and remove. They are typically used for temporary drainage (e.g., benign biliary strictures, bile leaks) and need to be exchanged every 3 months because they tend to occlude.
• Self-expanding metal stents (SEMS): Made of nitinol or stainless steel mesh, these stents expand to a larger diameter and remain patent for longer. They are preferred for malignant strictures requiring long-term palliation.

By Covering

• Uncovered stents: The bare metal mesh allows tissue ingrowth, which anchors the stent but may cause tumor ingrowth and re-obstruction over time.
• Fully covered stents: A membrane covers the entire stent, preventing tissue ingrowth. These are easier to remove or reposition but have a higher risk of migration.
• Partially covered stents: A compromise — the central portion is covered while the ends are bare, aiming to reduce both migration and ingrowth.

Indications for Stenting

• Malignant esophageal obstruction — restoring the ability to swallow in patients with inoperable esophageal or gastroesophageal junction cancer.
• Malignant biliary obstruction — relieving jaundice and preventing cholangitis in patients with pancreatic, bile duct, or gallbladder cancer.
• Benign biliary strictures — temporary stenting to treat strictures following liver transplant, cholecystectomy, or chronic pancreatitis.
• Gastric outlet obstruction — enabling oral intake in patients with tumors blocking the passage from the stomach to the small intestine.
• Colorectal obstruction — decompressing the bowel in acute malignant large bowel obstruction, either as palliation or as a bridge to elective surgery.
• Esophageal perforations and fistulas — covered stents can seal perforations or abnormal connections between the esophagus and airway.

Patient Preparation

• Fasting: Do not eat or drink for 8 hours before the procedure. If colonic stenting is planned, bowel preparation may be necessary.
• Imaging review: Bring recent CT scans, MRI, or endoscopy reports. These guide stent selection (length, diameter, type).
• Blood tests: A coagulation profile and complete blood count are required. Blood thinners may need to be paused.
• Consent: Your doctor will explain the procedure, alternatives, and potential risks. Do not hesitate to ask questions.
• Transportation: Arrange for someone to take you home, as sedation will impair your ability to drive.

How Stent Placement Works

1. Sedation: The procedure is performed under deep sedation or, in complex cases, general anesthesia.
2. Endoscopic assessment: The endoscope is advanced to the site of the stricture. The narrowing is evaluated, and its length and diameter are measured.
3. Guidewire placement: A guidewire is passed through the stricture under fluoroscopic (X-ray) guidance. This wire serves as a rail for stent delivery.
4. Dilation (if needed): If the stricture is too tight for stent deployment, gentle balloon dilation may be performed first.
5. Stent deployment: The stent delivery system is advanced over the guidewire, positioned across the stricture, and deployed. Metal stents self-expand over the following 24 to 48 hours to reach their full diameter. Plastic stents reach their final size immediately.
6. Confirmation: Correct positioning is confirmed by fluoroscopy and endoscopic visualization. Contrast injection may be used to verify patency.
7. Recovery: You are monitored in the recovery area for 1 to 2 hours.

Life with a Stent

Diet

• With an esophageal stent, eat slowly and chew food thoroughly. Avoid large boluses of meat, bread, or fibrous foods that may lodge in the stent. Soft, moist foods are generally well tolerated.
• Drink fluids with meals to help food pass through the stent.
• Sit upright during and for 30 minutes after meals to aid gravity-assisted passage.
• With biliary stents, no specific dietary restrictions are typically needed, but a low-fat diet may reduce discomfort.

Activities

• Most patients can return to normal activities within a few days of stent placement.
• Avoid heavy lifting or vigorous exercise for one week.
• Report any return of symptoms (difficulty swallowing, jaundice, abdominal pain, vomiting) promptly — this may indicate stent migration or obstruction.

Stent Replacement and Follow-Up

• Plastic biliary stents: Must be exchanged every 2 to 3 months to prevent occlusion and cholangitis. Your doctor will schedule routine replacements.
• Metal stents: Generally remain functional for 6 to 12 months or longer. If tumor ingrowth or overgrowth causes re-obstruction, a second stent can be placed inside the first (stent-in-stent technique).
• Esophageal stents: Followed clinically. If dysphagia recurs, endoscopic evaluation is performed to assess for tissue overgrowth, food impaction, or stent migration.
• Follow-up schedule: Your doctor will recommend periodic visits, blood tests (for biliary stents — liver function tests), and imaging as needed to monitor stent function.

Practical Tips

• Carry a card or note indicating you have a stent in place — this is important information for any healthcare provider you may visit.
• Keep a food diary during the first two weeks to identify which foods pass comfortably through an esophageal stent and which to avoid.
• Stay well hydrated — adequate fluid intake helps maintain stent patency.
• Do not skip scheduled stent exchange appointments for plastic stents — a clogged stent can lead to serious infections.
• If you notice a return of your original symptoms (jaundice, vomiting, difficulty swallowing), contact your doctor without delay.