7.2 Colostomy Management: Pouch Options, Odour Control & Bowel-Regulating Medications
Key Takeaways
- Closed-end pouches are appropriate only for predictable formed stool from a descending or sigmoid colostomy and are discarded rather than emptied, typically one to three times daily.
- Pancaking occurs when stool sticks at the top of an airtight pouch instead of dropping; the fix is to restore air and lubricity — a lubricating deodorant, a small amount of oil, or venting the filter — not a larger pouch.
- Stool softeners and osmotic laxatives may be recommended for colostomy constipation but are contraindicated in ileostomy, where the appropriate direction of therapy is antimotility agents to slow transit.
- Patients with a Hartmann’s procedure or a loop stoma retain a defunctionalized distal segment that continues to produce mucus, which may be passed per rectum — this is normal and is not a return of bowel function.
- Digital assessment of the stoma with a lubricated gloved fingertip evaluates the fascial ring for stenosis and is painless because stomal mucosa has no somatic innervation.
Colostomy Management: Pouch Options, Odour Control & Bowel-Regulating Medications
Quick Summary: Colostomy management is dominated by one variable — where in the colon the stoma sits — because that determines effluent consistency, and effluent consistency determines every appliance and medication decision that follows.
Matching the Appliance to the Colostomy Site
| Colostomy site | Effluent | Typical appliance |
|---|---|---|
| Ascending | Liquid to semi-liquid, enzyme-rich | Drainable pouch; treat much like an ileostomy for skin protection |
| Transverse | Pasty, unformed | Drainable pouch; larger capacity, often bulkier stoma |
| Descending / sigmoid | Formed, low enzyme activity, predictable | Closed-end or drainable; candidate for irrigation and stoma caps |
Closed-End Pouches
A closed-end pouch has no outlet. It is removed and discarded when full, typically one to three times a day, and is used with formed, predictable stool. Its advantages are discretion, a low profile, and no emptying in public restrooms. Its requirement is a two-piece system or an inexpensive one-piece, because the wafer would otherwise be changed several times daily and destroy the skin.
Closed-end pouches are inappropriate for liquid output, high volume, unpredictable patterns, or when the patient cannot reliably change them.
Stoma Caps and Security Pouches
A stoma cap is a small, filtered, minimally absorbent cover worn by patients who irrigate successfully and are continent between irrigations, or by patients with a mucous fistula that produces only mucus. It offers maximum discretion for swimming, intimacy, and sport, and it depends entirely on predictable continence.
Odour, Gas and Pancaking
Odour
Odour arises from bacterial fermentation of unabsorbed carbohydrate and putrefaction of dietary protein, generating volatile sulfur compounds. A well-sealed modern pouch is odour-proof; odour that reaches the room usually means a leak, a soiled outlet, or an unfiltered vent.
| Strategy | Detail |
|---|---|
| Integrated charcoal filter | Deodorizes venting gas; cover with the supplied waterproof sticker before bathing or swimming, since a wet filter stops working |
| Liquid pouch deodorants | Instilled into the pouch after each emptying; also lubricate the pouch film |
| Oral deodorizers | Bismuth subgallate and chlorophyllin copper complex — check for interactions and contraindications |
| Dietary modification | Reduce asparagus, broccoli, cabbage, onions, garlic, fish, eggs; parsley, yoghurt, buttermilk and cranberry juice are commonly reported to help |
| Outlet hygiene | Wipe the tail and clamp after emptying — a soiled outlet is the most common source of "the pouch smells" |
Gas
Reduce swallowed air first: no straws, no chewing gum, no carbonated drinks, avoid smoking, eat slowly with the mouth closed. Then reduce fermentable substrate: beans, cabbage family vegetables, dairy in lactose intolerance. Filters vent gas continuously and prevent ballooning.
Pancaking
Pancaking is stool adhering at the top of the pouch, directly over the stoma, instead of dropping to the bottom. It occurs when a filter has evacuated all air, the pouch film sticks to itself, and formed stool has nowhere to go. It causes the wafer to lift from underneath and is a common cause of unexplained leakage in sigmoid colostomies.
Fixes:
- Instil a lubricating deodorant, or a small amount of cooking oil, into the pouch after each change so the walls slide.
- Puff a little air into the pouch before applying it.
- Cover part of the filter with the supplied sticker so the pouch retains some air.
- Consider a pouch with a different film or an internal baffle designed to resist pancaking.
Bowel-Regulating Medications
The blueprint names anti-diarrhoeals and stool softeners under Intervention. The direction of therapy is opposite in the two main fecal diversions, which is exactly why it is testable.
| Situation | Goal | Typical agents | Cautions |
|---|---|---|---|
| Colostomy constipation | Soften and mobilize | Increased fluid and fibre; docusate; osmotic agents such as polyethylene glycol; bulk-forming agents with adequate fluid | Bulk agents without fluid worsen obstruction; avoid stimulant overuse |
| Colostomy diarrhoea | Slow transit | Loperamide; identify infectious, dietary, or medication causes | Rule out C. difficile before slowing transit |
| Ileostomy or high output | Slow transit, thicken | Loperamide first-line, dosed 30 to 45 minutes before meals and at bedtime; then diphenoxylate/atropine, codeine; PPI for gastric hypersecretion; octreotide if refractory | Laxatives and stool softeners are contraindicated |
| Ileostomy blockage | Relieve obstruction | Conservative measures, then stomal lavage by a trained clinician | Oral laxatives and cathartics are contraindicated |
Warning: Never give an ileostomy patient a laxative for "no output." Absent output in an ileostomy is an obstruction until proven otherwise, and a laxative drives fluid into an obstructed segment. Conversely, an antimotility agent given to a colostomy patient whose stoma has stopped working can convert constipation into obstruction. Establish which diversion you are dealing with before you recommend anything.
The Defunctionalized Distal Segment
Patients with a Hartmann's procedure retain an oversewn rectal stump; patients with a loop stoma have a distal limb; some have a separate mucous fistula. All of these segments retain goblet cells and continue producing mucus.
Teach explicitly:
- Passing mucus per rectum, or from a mucous fistula, is normal and does not mean bowel function has returned.
- A small pad or a stoma cap manages mucous fistula output.
- Patients may feel the urge to defecate from the retained rectum; sitting on the toilet and passing mucus relieves it.
- Diversion proctitis may develop in the defunctionalized segment, causing mucus discharge, tenesmus, or bleeding, and may require distal irrigation or topical therapy.
- New rectal bleeding or pain is not "just mucus" and requires evaluation.
Digital Stomal Assessment
A digital assessment — a lubricated, gloved fifth or index fingertip inserted gently into the stoma — evaluates the fascial ring for stenosis and the direction of the lumen. It is painless, because stomal mucosa has no somatic innervation, though patients feel pressure and should be told what to expect.
Findings and meaning:
- The fingertip passes easily → no significant stenosis.
- Tight constriction at the fascial level, with ribbon-like stool, cramping, and explosive output → stenosis, warranting surgical referral.
- The lumen aims downward toward the skin → explains a directional leak and indicates convexity.
Exam Tip: Routine dilation of a stenotic stoma with progressively larger dilators is not recommended as long-term management. It risks perforation of insensate bowel and causes further scarring and re-stenosis. Digital assessment is diagnostic; definitive correction of a fascial stricture is surgical.
A patient with a sigmoid colostomy reports that the wafer keeps lifting from underneath, and on inspection formed stool is packed at the top of the pouch directly over the stoma rather than falling to the bottom. What is the appropriate intervention?
An ileostomy patient calls to report that there has been no output for eight hours and asks whether they should take the polyethylene glycol they have at home. What is the correct advice?
A patient who had a Hartmann’s procedure six months ago calls, alarmed that they are passing mucus from the rectum. How should the nurse respond?
A patient with a descending colostomy reports ribbon-like stool, cramping, and explosive output. Digital assessment reveals a tight constriction at the fascial level. What is the appropriate long-term management approach?