Management of Constipation in Post-Surgical Patients

Assessment and Diagnosis

The American Gastroenterological Association recommends that a patient who has not had a bowel movement for 3-4 days meets the criteria for constipation 1
The presence of gas passage indicates the absence of complete obstruction, as suggested by the National Comprehensive Cancer Network 2
Opioids, such as oxycodone, are known to cause constipation, according to the American Gastroenterological Association and the National Comprehensive Cancer Network 3, 4
Calcium carbonate, an ingredient in Tums, can contribute to constipation, as noted by the National Comprehensive Cancer Network 4

The American Gastroenterological Association recommends administering lactulose 15-30 mL orally as an initial dose for constipation 1
Monitoring for bowel movement within 24-48 hours after lactulose administration is advised by the American Gastroenterological Association 1

Lactulose is an FDA-approved osmotic laxative that draws water into the intestine to hydrate and soften stool, as described by the American Gastroenterological Association 1, 5
Lactulose promotes peristalsis in the colon, which is beneficial in opioid-induced constipation, according to the American Gastroenterological Association 1
Clinical studies show that lactulose is associated with increased bowel movement frequency compared to placebo, as reported by the American Gastroenterological Association 1

A soap suds enema could be considered if lactulose does not produce results within 24-48 hours, as suggested by the National Comprehensive Cancer Network 2, 4
Stimulant laxatives like bisacodyl (10-15 mg daily) are recommended for opioid-induced constipation by the National Comprehensive Cancer Network 2, 6

Monitoring for bloating and flatulence, common side effects of lactulose, is recommended by the American Gastroenterological Association 1
Starting with a lower dose of lactulose is advised for patients with sensitive bowels or the elderly, as noted by the American Gastroenterological Association 1, 7
Ensuring adequate fluid intake while administering lactulose is suggested by the National Comprehensive Cancer Network 6

If no bowel movement occurs within 24-48 hours after lactulose administration, reassess for potential bowel obstruction or need for additional interventions, as recommended by the National Comprehensive Cancer Network 2, 4, 6
Consider prophylactic bowel regimen for ongoing opioid use, as patients do not develop tolerance to opioid-induced constipation, according to the National Comprehensive Cancer Network 4, 6

Ensuring the patient is adequately hydrated is crucial, as noted by the National Comprehensive Cancer Network 4
Monitoring for any signs of post-surgical complications that might affect bowel function is recommended by the National Comprehensive Cancer Network 4