Management of Dilated Large and Small Bowel Loops

Initial Assessment and Imaging

The World Journal of Emergency Surgery recommends obtaining a CT scan of the abdomen/pelvis with IV contrast immediately to differentiate complete from partial obstruction and identify the underlying cause 1
CT is superior to plain radiography and ultrasound for diagnostic accuracy and provides critical information about signs requiring immediate surgery, location and level of obstruction, and underlying etiology 1, 2
Signs requiring immediate surgery include closed loop obstruction, bowel ischemia, free fluid suggesting perforation, or peritonitis 1, 2

The World Journal of Emergency Surgery recommends proceeding immediately to surgery if clinical peritonitis is present on examination 1
CT findings of bowel ischemia, strangulation, or closed loop obstruction also require immediate surgery 1
Pneumatosis intestinalis or portal venous gas are indications for immediate surgery 2

The cornerstone of non-operative management includes nil per os, nasogastric tube decompression, aggressive IV fluid resuscitation and electrolyte correction, and serial abdominal examinations every 4 hours 1
Water-soluble contrast administration can be used to assess the likelihood of resolution without surgery, with a high likelihood of resolution if contrast reaches the colon within 24 hours 2
The maximum duration of non-operative trial is considered safe for most patients without clinical deterioration is 72 hours 1

Dilated segments can promote bacterial overgrowth, causing malabsorption and diarrhea, and can be treated with rotating antibiotics such as rifaximin, amoxicillin-clavulanate, metronidazole, ciprofloxacin, or doxycycline 3, 4, 6
Surgical options for chronic dilated bowel include simple tapering enteroplasty and LILT or STEP procedures to lengthen and taper bowel without losing surface area 3, 4, 5

For vomiting with dilated bowel, 5-HT3 antagonists such as ondansetron can be used as first-line antiemetic, and consider venting gastrostomy if NG decompression provides relief 6
For diarrhea from bacterial overgrowth, rifaximin 550 mg twice daily for 1-2 weeks can be used as first-line treatment, and rotate antibiotics every 2-6 weeks to prevent resistance 6, 7

Do not delay surgery beyond 72 hours in adhesive small bowel obstruction without clear improvement 1
Do not give water-soluble contrast before adequate gastric decompression due to the risk of aspiration pneumonia 2
Do not perform ill-considered surgery in short bowel syndrome patients, as any further bowel loss is catastrophic 5
Monitor for metronidazole peripheral neuropathy and ciprofloxacin-associated tendonitis with prolonged use 6