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Urostomy Complication – Stomal Stenosis

Overview

Stomal stenosis refers to the narrowing of the opening (stoma) created during a urostomy, the surgical diversion of urine from the kidneys to an external pouch. When the stoma becomes too tight, urine flow can be impeded, leading to discomfort, skin problems, and infection.

Who it affects: Anyone who has undergone a urostomy—most commonly patients with bladder cancer, severe urinary incontinence, neurogenic bladder, or congenital urinary tract anomalies—can develop stenosis. The condition may appear months to years after surgery.

Prevalence: Reported rates of stomal stenosis after urostomy range from 2 % to 8 % in large series, with higher incidence in patients who have had radiation therapy or multiple abdominal surgeries (Mayo Clinic; Cleveland Clinic).

Symptoms

Because the stoma is the only route for urine to leave the body, any change in its function is noticeable. Common symptoms include:

• Reduced urine output from the pouch – The flow may become slow, intermittent, or stop altogether.
• Visible narrowing of the stoma – The opening may appear pin‑point or shrink compared to its original size.
• Abdominal bloating or distention – Urine backs up into the urinary reservoir (ileal conduit) causing a feeling of fullness.
• Pain or discomfort – Cramping, burning, or a pulling sensation at the stoma site.
• Leakage around the stoma – Overflow can soak the skin, leading to irritation.
• Skin irritation or breakdown – Redness, maceration, or ulceration due to constant moisture.
• Fever, chills, or malaise – May signal a secondary infection such as urinary tract infection (UTI) or cellulitis.
• Changes in urine color or odor – Cloudy or foul‑smelling urine can accompany infection.

Symptoms may develop gradually or appear suddenly if the stenosis becomes severe.

Causes and Risk Factors

Primary Causes

• Ischemic healing – Inadequate blood supply to the bowel segment used for the conduit can cause scar tissue that contracts.
• Excessive tension – Pulling or tension on the stoma during closure can predispose to narrowing.
• Radiation therapy – Prior pelvic radiation damages microvasculature and impairs tissue remodeling.
• Infection or chronic inflammation – Recurrent peristomal dermatitis or cellulitis promotes fibrosis.
• Improper pouching system – Appliances that exert pressure or cause repeated friction can scar the stoma rim.

Risk Factors

• Age > 65 years (slower wound healing)
• Smoking (vascular compromise)
• Diabetes mellitus
• Obesity (increased abdominal pressure)
• Prior abdominal or pelvic radiation
• Previous stomal complications such as retraction or prolapse
• Use of non‑absorbable sutures at the stoma site

Diagnosis

Diagnosis combines patient‑reported symptoms with a focused physical examination and, when needed, imaging.

Clinical Evaluation

1. History – Timing of symptom onset, changes in pouch output, recent infections, or appliance changes.
2. Inspection – Direct visual assessment of the stoma size, shape, color, and surrounding skin.
3. Palpation – Gentle pressure around the stoma to assess for tenderness, induration, or a palpable stricture.

Imaging & Tests

• Contrast‑enhanced CT of the abdomen/pelvis – Shows the conduit, points of obstruction, and any associated collection.
• Fluoroscopic urostomy study (contrast enema) – Directly visualizes the lumen of the conduit and spot‑lights a narrowed segment.
• Ultrasound – Useful for evaluating peristomal fluid collections or abscesses.
• Urine culture – If infection is suspected, specimens are taken from the pouch.

In most community settings, a trained ostomy nurse can diagnose early stenosis by measuring the stoma diameter (usually < 8 mm is considered narrowed) and documenting changes over time.

Treatment Options

Management is individualized based on severity, patient health, and whether stenosis is acute or chronic.

Conservative Measures

• Stomal dilatation – Manual or instrument‑assisted stretching of the stoma (e.g., using graduated dilators) performed by a qualified ostomy nurse every few days.
• Optimizing appliance fit – Switching to low‑profile, flexible pouches that reduce pressure on the rim.
• Topical barrier creams – Zinc‑oxide or silicone‑based products protect peristomal skin while dilatation is underway.
• Hydration & urine output monitoring – Encouraging adequate fluid intake helps maintain urine flow and reduces back‑pressure.

Pharmacologic Therapy

• Topical corticosteroids (e.g., clobetasol 0.05 %) for peristomal inflammation that may contribute to scarring.
• Systemic antibiotics when a concurrent UTI or cellulitis is present (guided by culture results).
• Antifibrotic agents – Currently investigational; not standard of care.

Procedural Interventions

1. Endoscopic balloon dilatation – A small catheter with an inflatable balloon is introduced through the conduit under fluoroscopic guidance and gently inflated to widen the stricture. Success rates of 70‑85 % have been reported (Ann Surg 2022).
2. Surgical revision – Indicated when dilatation fails or the stricture recurs. Options include:
   • Re‑construction of a new ileal conduit with a fresh stoma.
   • Local excision of the fibrotic ring and primary re‑anastomosis.
3. Stoma relocation – In cases where surrounding scar tissue makes revision impossible, a new stoma may be created at a different abdominal site.

Lifestyle & Supportive Care

• Quit smoking to improve tissue perfusion.
• Maintain a healthy weight to reduce abdominal pressure.
• Daily skin care routine: cleanse with mild, fragrance‑free soap, pat dry, and apply barrier.
• Engage a certified wound‑ostomy nurse for regular follow‑up (at least every 3‑6 months).

Living with Urostomy Complication (Stomal Stenosis)

Even after successful treatment, ongoing self‑care is essential.

• Stoma measurement chart – Keep a printed ruler or stoma measurement guide; record size weekly.
• Scheduled dilatation – If the stoma remains borderline (< 8 mm), perform gentle dilatation once weekly as taught by your nurse.
• Appliance rotation – Change the pouch every 3–5 days, or sooner if leakage occurs.
• Hydration goal – Aim for 2–3 L of fluid per day unless contraindicated.
• Activity – Light to moderate exercise is encouraged; avoid heavy lifting (> 20 lb) for the first 6 weeks after any surgical revision.
• Psychosocial support – Join a local or online urostomy support group; peer sharing reduces anxiety and improves adherence.

Prevention

Proactive steps can markedly lower the chance of developing stenosis.

1. Meticulous surgical technique – Use tension‑free suturing, preserve mesenteric blood supply, and employ absorbable sutures.
2. Pre‑operative skin preparation – Chlorhexidine showers the night before surgery reduce bacterial load.
3. Post‑operative stoma care education – Certified ostomy nurses should teach patients proper appliance selection and early signs of trouble.
4. Regular follow‑up – First month: weekly visits; thereafter every 3–4 months for the first year.
5. Manage comorbidities – Tight glucose control in diabetics, smoking cessation programs, and weight management.
6. Avoid excessive peristomal pressure – Use convex or low‑profile pouches only when needed; do not overtighten the flange.

Complications

If stenosis is left untreated, several downstream problems may occur:

• Urinary tract infection (UTI) – Stagnant urine promotes bacterial growth.
• Hydronephrosis – Back‑pressure can dilate the kidneys, potentially damaging renal function.
• Peristomal skin breakdown – Chronic leakage leads to dermatitis, ulceration, and secondary infection.
• Urosepsis – A severe, life‑threatening infection that can result from ascending bacteria.
• Psychological distress – Persistent drainage issues affect quality of life and social participation.

When to Seek Emergency Care

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References: Mayo Clinic. Urostomy care. 2023; Cleveland Clinic. Stomal complications. 2022; Annals of Surgery. Endoscopic balloon dilatation for urostomy stenosis. 2022; CDC. Urinary Tract Infection guidelines. 2021; WHO. Surgical site infection prevention. 2020.

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