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Large Bowel Obstruction Management (WSES 2018)

Large Bowel Obstruction Management (WSES 2018): Suspected Large Bowel Obstruction → Diagnostic Workup → Complete Obstruction Confirmed? → Signs of Perfo...

Pathway Overview

16 steps

Algorithm Steps

16 total

  1. 01Start

    Suspected Large Bowel Obstruction

    Abdominal distension, obstipation, vomiting (late), crampy abdominal pain. Etiology: 60% colorectal cancer, 20% diverticular disease, 5% volvulus, others.

  2. 02Action

    Diagnostic Workup

    1) CT abdomen/pelvis with IV + rectal contrast: Gold standard - identifies transition point, etiology, signs of ischemia/perforation. 2) Plain AXR: Dilated colon >6cm, no gas in rectum. 3) Labs: CBC, BMP, lactate, CEA if cancer suspected.

  3. 03Decision

    Complete Obstruction Confirmed?

    CT showing transition point, dilated proximal colon, decompressed distal colon. Rule out pseudo-obstruction (Ogilvie) - no transition point, history of recent surgery/illness/medications.

  4. 04Decision

    Signs of Perforation or Ischemia?

    Perforation: Free air, extraluminal contrast. Ischemia: Mucosal enhancement loss, pneumatosis, mesenteric stranding, portal venous gas. Cecal diameter >12cm = impending perforation risk.

  5. 05Warning

    ⚠️ Cecal Diameter >12cm

    High risk of imminent perforation even without current signs. Emergency surgery should not be delayed. Cecal perforation has high mortality.

  6. 06Action

    Emergency Laparotomy

    Perforation or ischemia requires immediate surgery. No role for SEMS. Resection of affected segment + source control. Anastomosis vs ostomy based on patient stability and contamination.

  7. 07Action

    Postoperative Management

    1) Enhanced recovery protocol. 2) Oncology referral for cancer staging/adjuvant therapy. 3) Stoma education if applicable. 4) Nutritional support. 5) VTE prophylaxis. 6) Monitor for anastomotic leak if primary anastomosis.

  8. 08Outcome

    Obstruction Relieved

    Bowel decompressed. Continue oncologic workup and treatment. Plan ostomy reversal if applicable.

  9. 09Decision

    Location of Obstruction?

    Right-sided: Cecum to hepatic flexure. Left-sided: Splenic flexure to sigmoid. Location determines surgical approach.

  10. 10Action

    Right-Sided Obstruction

    Preferred: Right hemicolectomy with primary ileocolic anastomosis (one-stage). Safe in most patients even in emergency. Advantages: Single surgery, no ostomy, complete oncologic resection.

  11. Path rejoins step 07Shared downstream outcome
  12. 11Decision

    Left-Sided Obstruction - Options

    Consider patient fitness, tumor characteristics, institutional expertise. Options: 1) Hartmann's procedure. 2) SEMS as bridge to surgery. 3) Resection + primary anastomosis + loop ileostomy.

  13. 12Decision

    SEMS Candidate?

    Consider SEMS if: Curative intent, tumor accessible to endoscopy, no perforation, patient can tolerate colonoscopy, expertise available. Contraindicated if: Perforation, peritonitis, >4cm tumor length, complete obstruction preventing scope passage.

  14. 13Action

    SEMS as Bridge to Surgery

    Endoscopic placement of self-expanding metal stent. Decompress colon over 5-14 days. Allows: Bowel prep, staging workup, nutritional optimization. Then elective laparoscopic resection with primary anastomosis. Lower ostomy rate.

  15. Path rejoins step 07Shared downstream outcome
  16. 14Action

    Hartmann's Procedure

    Sigmoid/left colon resection with end colostomy and rectal stump closure. Safest option in: High-risk patients, severe contamination, hemodynamic instability. Ostomy reversal possible but <50% actually reversed.

  17. Path rejoins step 07Shared downstream outcome
  18. 15Action

    Resection + Primary Anastomosis

    Left colectomy with primary colorectal anastomosis. Consider: 1) On-table lavage to decompress colon. 2) Subtotal colectomy with ileocolic anastomosis. 3) Protecting loop ileostomy. Higher leak risk in emergency but avoids permanent ostomy.

  19. Path rejoins step 07Shared downstream outcome
  20. 16Action

    If Volvulus Identified

    Sigmoid volvulus: Attempt endoscopic derotation first (if no ischemia). If successful, plan semi-elective sigmoid resection. If necrosis/perforation: Emergency laparotomy. Cecal volvulus: Surgery required - right hemicolectomy or cecopexy.

  21. Path rejoins step 07Shared downstream outcome

Guideline Source

WSES 2017 Guidelines on Colon and Rectal Cancer Emergencies: Obstruction and Perforation

DOI: 10.1186/s13017-018-0192-3View Guideline

Clinical Safety Information

Clinical Decision Support — Not a Substitute for Clinical Judgment

Individual patient factors may require deviation from these recommendations.

Known Limitations

  • Focused on malignant obstruction - volvulus and other causes have different management
  • SEMS availability and expertise varies by institution
  • Oncologic outcomes after SEMS bridge still debated
  • Does not address palliative stenting in detail
  • Pediatric LBO has different etiology and management

Contraindicated Populations

pediatric

Applicable Regions

USEUGlobal

Global: WSES guidelines widely adopted for emergency colorectal surgery

Version 1Next review: 2028-01-01

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Frequently Asked Questions

What is the Large Bowel Obstruction Management (WSES 2018)?

The Large Bowel Obstruction Management (WSES 2018) is a emergency clinical algorithm for General Surgery. It provides a structured decision tree to guide clinical decision-making, based on WSES 2017 Guidelines on Colon and Rectal Cancer Emergencies: Obstruction and Perforation.

What guideline is the Large Bowel Obstruction Management (WSES 2018) based on?

This algorithm is based on WSES 2017 Guidelines on Colon and Rectal Cancer Emergencies: Obstruction and Perforation (DOI: 10.1186/s13017-018-0192-3).

What are the limitations of the Large Bowel Obstruction Management (WSES 2018)?

Known limitations include: Focused on malignant obstruction - volvulus and other causes have different management; SEMS availability and expertise varies by institution; Oncologic outcomes after SEMS bridge still debated; Does not address palliative stenting in detail; Pediatric LBO has different etiology and management. Individual patient factors may require deviation from these recommendations.

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