Management of Abdominal Distention in Patients with Clostridioides difficile Infection

Mechanism and Pharmacokinetics

Oral vancomycin is poorly absorbed from the gastrointestinal tract in most patients with normal intestinal mucosa, which is why it's effective for treating CDI while minimizing systemic effects 1, 2
High doses of vancomycin (500 mg four times daily), prolonged exposure, and renal failure can increase the risk of systemic absorption 2

Abdominal distention is not listed as a direct adverse effect of oral vancomycin in clinical practice guidelines 1, 2, 3
In patients with severe or fulminant CDI, abdominal distention may occur as part of the disease process, manifesting as ileus 1, 2 or megacolon 2, 3
The American College of Physicians and the Infectious Diseases Society of America recommend vancomycin as a first-line treatment for CDI, with dosing regimens including 500 mg four times daily for fulminant CDI 1, 2
For patients with severe abdominal distention suggesting megacolon or perforation, surgical evaluation should be obtained early 2, 4
Subtotal colectomy with preservation of the rectum may be necessary for patients with severe abdominal distention 2
Alternative approaches include diverting loop ileostomy with colonic lavage followed by antegrade vancomycin flushes 2

If abdominal distention is present due to ileus in a patient requiring vancomycin, vancomycin can be administered rectally as a retention enema (500 mg in approximately 100 mL normal saline every 6 hours) 1, 2
Intravenous metronidazole (500 mg every 8 hours) should be administered together with oral or rectal vancomycin 1, 2
Higher doses of oral vancomycin (up to 500 mg four times daily) may be considered in fulminant CDI 4, 5

Monitor for signs of systemic absorption of oral vancomycin in patients with renal failure 2
If abdominal distention develops or worsens during oral vancomycin therapy, evaluate for worsening CDI 1, 2, development of ileus or toxic megacolon 2, 4, need for alternative administration routes (rectal vancomycin) 1, 2, or need for surgical intervention 2, 4

Oral vancomycin has no significant difference in adverse event rates compared to metronidazole (OR = 1.18, 95% CI 0.80–1.74; p = 0.41) 6

Higher doses (250 mg or 500 mg four times daily) may be used for severe or fulminant CDI 6, 7

There is concern that vancomycin use may be associated with increasing prevalence of VRE, though this risk must be balanced against clinical need 8
Metronidazole use has also been associated with increased VRE carriage rates 8

Therapeutic drug monitoring should be considered in high-risk situations where systemic absorption is likely, such as severe CDI with significant bowel inflammation 7
Prolonged therapy courses may require therapeutic drug monitoring 6

Trans-stoma vancomycin administration can be effective in surgical patients with altered gastrointestinal anatomy, such as those with ostomies 9
In patients with ostomies, the standard oral route of administration may be compromised due to altered gastrointestinal anatomy 9

The World Society of Emergency Surgery guidelines suggest that trans-stoma vancomycin may be effective in surgical patients with ostomies 9
In patients with severe C. difficile colitis who have undergone diverting loop ileostomy, postoperative antegrade instillation of vancomycin flushes via the ileostomy has been shown to be effective 10, 11
A prospective study of patients with fulminant C. difficile colitis managed by loop ileostomy and postoperative antegrade vancomycin flushes demonstrated reduced mortality compared to historical controls 10
Preservation of the colon was achieved in 93% of patients with fulminant C. difficile colitis, with vancomycin antegrade enemas continued via the ileostomy every 6 hours for 10 days 10

Standard oral vancomycin dosing for C. difficile colitis is 125 mg four times daily for 10 days 9
For severe or fulminant C. difficile infection, higher doses (up to 500 mg four times daily) may be considered 9

For patients with severe C. difficile colitis and an ostomy, consider increasing the dose to 500 mg four times daily via the ostomy 9
Monitor for signs of worsening infection, including increasing leukocytosis, fever, and abdominal pain 12
For patients with fulminant C. difficile colitis and an ostomy, administer vancomycin 500 mg four times daily via the ostomy plus intravenous metronidazole 500 mg three times daily 12
Consider adding vancomycin retention enemas if rectal stump is present 12
Early surgical evaluation should be provided for patients with fulminant C. difficile colitis and an ostomy 12