Management of Chronic Slow Transit Constipation with Recurrent Small Bowel Obstruction

Diagnostic Approach

The American College of Radiology recommends obtaining CT abdomen and pelvis with IV contrast to identify the site, cause, and presence of complications such as ischemia, closed-loop obstruction, or volvulus, with a diagnostic accuracy of >90% for SBO 1, 3
CT imaging should be used to look specifically for signs of ischemia, including abnormal bowel wall enhancement, intramural hyperdensity, bowel wall thickening, mesenteric edema, ascites, pneumatosis, or mesenteric venous gas, which warrant immediate surgery 1

The American College of Radiology suggests implementing a water-soluble contrast challenge with 100 mL hyperosmolar iodinated contrast diluted in 50 mL water via nasogastric tube or orally, to predict the need for surgery 1, 2
If contrast reaches the colon by 24 hours, surgery is rarely required, but if it does not, surgical intervention is likely necessary 1, 2

The American Gastroenterological Association recommends immediately discontinuing all opioids and anticholinergic medications, as these directly worsen both slow transit constipation and pseudo-obstruction by reducing peristalsis 4
The American Gastroenterological Association advises avoiding secretory laxatives like high-dose polyethylene glycol early in treatment, as they can worsen hypokalemia and exacerbate distension 4

The European Society for Clinical Nutrition and Metabolism recommends assessing for malnutrition and considering nutritional support, such as gastric feeding via nasogastric tube, jejunal feeding, or parenteral nutrition, in patients with recurrent SBO 5, 6
The European Society for Clinical Nutrition and Metabolism suggests initiating parenteral nutrition without delay if enteral routes fail and the patient is malnourished, to prevent further deterioration 5, 6

The American Society of Colon and Rectal Surgeons recommends that surgery should only be considered after failed maximal medical therapy, confirmed isolated slow transit constipation on physiologic testing, exclusion of small bowel dysmotility, and psychological evaluation 5
The American Society of Colon and Rectal Surgeons suggests that subtotal colectomy with ileorectal anastomosis is the standard operation for medically refractory slow transit constipation, with >80% success rates when strict selection criteria are used 5
The American Society of Colon and Rectal Surgeons recommends considering alternative surgical options, such as tapering enteroplasty, serial transverse enteroplasty (STEP), or segmental reversal of small bowel (SRSB), for specific scenarios 6, 7