What is the appropriate management of an adult patient presenting with sigmoid volvulus?

Management of Sigmoid Volvulus

Initial Diagnostic Approach

Plain abdominal radiographs are the first-line imaging test, looking for the pathognomonic "coffee bean" sign projecting toward the upper abdomen. 1, 2

• If clinical assessment and plain films are insufficient or if ischemia/perforation is suspected, proceed immediately to CT imaging with intravenous contrast, which has an 89% diagnostic yield and demonstrates the characteristic "whirl sign" of twisted mesentery. 1, 2
• Blood gas and lactate levels are crucial, though bowel ischemia may be present even without hyperlactatemia, particularly in elderly patients with neuropsychiatric issues who may not provide accurate history. 1
• Water-soluble contrast enema showing a "bird's beak" sign can confirm diagnosis but is strictly contraindicated if perforation is suspected. 1, 2

Treatment Algorithm: The Critical Decision Point

Immediate Surgery Required (No Endoscopy)

Proceed directly to emergency sigmoid resection if any of the following are present:

• Septic shock 1, 3
• Clinical signs of bowel ischemia or perforation 1, 3
• Peritonitis on examination 1
• Free air on imaging 1

Surgical options:

• Hartmann's procedure (sigmoid resection with end colostomy) for hemodynamically unstable patients or those with fecal contamination 1, 3
• Sigmoid resection with primary anastomosis may be considered in stable patients with purulent (not feculent) peritonitis 3
• Emergency surgery carries 12-40% mortality with surgical site infections in 42.86% of cases 1, 3, 4

Endoscopic Decompression First (Uncomplicated Cases)

For patients without signs of ischemia, perforation, or peritonitis, urgent flexible colonoscopy is the first-line treatment with 60-95% success rates. 1, 3, 2

Critical technical requirements:

• The endoscopist must visualize and pass both transition points to achieve successful detorsion 1, 3
• Mandatory mucosal inspection at the end of the procedure to assess sigmoid viability 1, 3
• Abort immediately if advanced mucosal ischemia or impending perforation is observed—these patients require emergency colectomy 3
• Leave a decompression tube in place after successful detorsion 1, 3
• Flexible endoscopy is superior to rigid sigmoidoscopy with lower perforation rates 2
• Procedure-related mortality is 0.3-3% 3, 2

Definitive Management: The Non-Negotiable Step

After successful endoscopic decompression, sigmoid resection MUST be performed during the same hospital admission. 1, 3, 2

This recommendation is absolute because:

• Without resection, recurrence rates are 45-71%, with median time to recurrence of 31 days 3, 5
• Each recurrent episode carries risk of ischemia, perforation, and death 1, 3
• Elective sigmoid resection has 5.9% mortality versus 40% mortality for emergency surgery when recurrence occurs with gangrene 3, 4
• Of patients discharged after decompression alone, 25% require emergent colectomy for recurrence 3
• Conservative management alone carries 9-36% mortality 3, 5

Surgical approach for elective resection:

• Remove the entire redundant sigmoid colon to minimize recurrence risk 3
• Primary anastomosis without stoma is typically feasible in the non-emergency setting 3
• Laparoscopic approach may be suitable in select cases at experienced centers, though benefits in emergency settings remain unclear 1, 2

High-Risk Patients Who Cannot Tolerate Surgery

Endoscopic fixation techniques (percutaneous endoscopic colopexy) may be reserved for patients with prohibitive surgical risk, though this carries a 10% major complication rate and should be considered a last resort. 1, 3

Critical Risk Factors for Mortality

Special attention and aggressive management required for:

• Age over 60 years 1, 2
• Shock on admission 1, 2
• History of previous volvulus episode 1, 2

Post-Decompression Care

• Fluid resuscitation immediately to address ischemia-reperfusion injury 1
• Broad-spectrum antibiotics to control bacterial translocation across ischemic intestinal wall 1
• Monitor for intestinal ulcer and perforation from reperfusion injury 1

Special Population: Pregnancy

• Sigmoid volvulus in pregnancy is rare but carries 6-12% maternal mortality and 20-26% fetal mortality 1, 3
• Endoscopic detorsion is preferred initially but may be ineffective in third trimester due to uterine volume 1, 3
• Multidisciplinary approach involving surgery, obstetrics, and neonatology is mandatory 3
• Definitive surgery can be safely performed from second trimester onward without significant fetal impact 1, 3

Procedures to Avoid

Detorsion alone, sigmoidopexy, and mesosigmoidoplasty have 16-36% recurrence rates and are inferior to definitive sigmoid colectomy. 3