Endoscopic Decompression for Terminal Ileum Obstruction

1. Relevant Causes of Terminal Ileum Obstruction

2. Colonoscopic Decompression - Technique and Indications

• Performed without prior bowel preparation (to reduce perforation risk)
• Minimal air insufflation - preferably CO2 to reduce distension
• Air and liquid stool aspirated through a large-bore suction channel
• Scope advanced to the proximal transverse colon under fluoroscopic guidance is sufficient; this achieves decompression in ~50% of cases by simple aspiration
• A guidewire is then passed through the accessory channel and the scope is withdrawn slowly under fluoroscopy; a decompression tube (14 Fr) is left over the wire with low intermittent suction + saline flushes every 4-6 hours

• Sabiston Textbook of Surgery, p. 2086
• Current Surgical Therapy 14e (Colonoscopic Decompression section)

Before/after radiographs of colonoscopic decompression tube placement - Clinical GI Endoscopy

3. Endoscopic Management of Meconium Ileus / DIOS at the Terminal Ileum

• Water-soluble contrast enema (e.g., Gastrografin - sodium and meglumine amidotrizoate) or dilute N-acetylcysteine enema
• Reflux of contrast into the terminal ileum dissolves/dislodges the inspissated meconium pellets
• Success rate ~60-70% in neonates; older patients (DIOS) treated similarly
• Sequential enemas may be needed
• Rare complications: intestinal perforation, mucosal injury, persistent obstruction

• Mulholland and Greenfield's Surgery 7e, p. 5512

4. Endoscopic Balloon Dilation (EBD) for Strictures at the Terminal Ileum

• Colonoscope is advanced through the ileocecal valve into the terminal ileum
• Guide wire placed across the stricture under fluoroscopic guidance
• Through-the-scope (TTS) balloon dilator deployed - applies purely radial force
• General rule: limit to 3 successive sizes per session (incremental approach)
• Steroid injection (triamcinolone/Kenalog) into the stricture margins reduces post-dilation fibrosis and re-stricture
• Fluoroscopic guidance recommended to confirm balloon positioning and assess full dilation (waist effacement)

• Short strictures (<4-5 cm), non-fistulizing, non-phlegmonous
• Benign anastomotic strictures (post-ileocecal resection)
• TB, radiation, ischemia-related short strictures at terminal ileum

• Provides short-term relief; repeat dilation required in a significant minority
• Not suitable for long strictures, active inflammation with abscess/fistula, or suspicion of malignancy

• Maingot's Abdominal Operations, p. 63 (Endoscopic Dilation)
• Goldman-Cecil Medicine: "Endoscopic dilation will usually alleviate symptoms, but repetitive dilation is required in a significant minority of patients"

5. Endoscopic Stenting at the Ileocecal Region

• Obstructing cecal/right colon carcinoma blocking the ICV (palliative bridge-to-surgery)
• Rare cases of extrinsic obstruction at the terminal ileum

6. What Endoscopy CANNOT Treat

• Mechanical adhesive SBO (the most common cause of small bowel obstruction) - requires surgery or laparoscopic lysis of adhesions
• Strangulated obstruction with ischemia (peritonitis, fever, leukocytosis, CT with devascularized loop) - emergency surgery
• Volvulus with compromised mesentery (e.g., ileosigmoid knotting): attempted colonoscopic decompression will fail because the mesentery is physically wrapped, and the attempt may delay surgery
• Perforation or peritonitis at presentation

Current Surgical Therapy 14e notes: "Ileosigmoid knotting may be confused for sigmoid volvulus on imaging prompting attempted endoscopic decompression. In these cases, endoscopic decompression will fail due to the wrapping of the mesentery, further raising..."

7. Management Algorithm

Terminal Ileum Obstruction
         |
         ├── Mechanical SBO (adhesions, hernia) → Surgery / laparoscopy
         |
         ├── DIOS / Meconium Ileus → Retrograde Gastrografin/NAC enema
         |         └── Fails → Operative enterotomy + irrigation
         |
         ├── Crohn's / anastomotic stricture → Ileoscopic balloon dilation
         |         └── + steroid injection; repeat PRN
         |
         ├── Ileocecal obstruction (neoplasm) → Colonoscopic SEMS (palliation)
         |
         └── Pseudo-obstruction extending to cecum/ileum
                   → Conservative → Neostigmine → Colonoscopic decompression
                   └── Tube left in situ; PEG after decompression to prevent recurrence

Key Points Summary

1. Colonoscopic decompression is most evidence-based for Ogilvie's syndrome (ACPO) - success 61-95%, done with CO2, minimal insufflation, decompression tube left over guidewire.
2. Retrograde contrast enema is the first-line endoscopic approach for terminal ileum DIOS/meconium ileus.
3. Endoscopic balloon dilation via ileoscopy is the procedure of choice for short benign strictures (Crohn's, anastomotic, TB) at the terminal ileum.
4. All endoscopic approaches are contraindicated when there is peritonitis, perforation, strangulation, or ischemia.
5. After successful endoscopic decompression, polyethylene glycol (PEG) twice daily for 7 days reduces recurrence of colonic distension.
6. Failure of colonoscopic decompression leads to percutaneous cecostomy (endoscopic or IR-guided) as a bridge before surgery.

Terminal ileum colonoscopy: healthy mucosa with mechanical luminal obstruction ~10 cm proximal to the ileocecal valve

Ileal stricture with luminal narrowing - candidate for endoscopic balloon dilation (EBD)