9.3 Perifistular Skin Care & Selecting a Containment Option
Key Takeaways
- Perifistular skin damage is caused by the same enzymatic and moisture mechanisms as peristomal damage, but effluent volumes are often higher and the surrounding surface is frequently a wound rather than intact skin.
- The crusting technique — hydrocolloid powder, dust off the excess, seal with a non-alcohol barrier film, repeated two to three times — is the foundational treatment for denuded perifistular skin and creates an adherable surface.
- Containment escalates with output: absorptive dressings for low output, a pouch or wound manager for moderate to high output, and isolation techniques with negative pressure wound therapy for a fistula sitting in an open wound.
- Barrier rings, strip paste, and moldable seals are used to fill irregular contours around a fistula, and a bridging or trough technique isolates a fistula from an adjacent incision or wound.
- Cauterization with silver nitrate is reserved for focal hypergranulation at the fistula margin, with surrounding intact skin protected, and is never applied to a suspected malignancy or to a bleeding varix.
Perifistular Skin Care & Selecting a Containment Option
Quick Summary: The blueprint lists perifistular skin care as an Intervention knowledge item and managing perifistular skin and complications as a Treatment skill. The principles are the same as peristomal care, but three things are harder: the volumes are larger, the contours are worse, and the surrounding surface is often a wound rather than skin.
Why Perifistular Skin Fails
| Mechanism | Detail |
|---|---|
| Enzymatic digestion | Proximal small bowel effluent carries active trypsin, chymotrypsin, and lipase. These digest the stratum corneum exactly as they digest food |
| Moisture-associated damage | Continuous wetness over-hydrates the corneocytes, and an over-hydrated stratum corneum has almost no barrier function |
| pH disruption | Alkaline small bowel effluent destroys the acid mantle, permitting Candida and bacterial overgrowth |
| Mechanical trauma | Frequent dressing changes on failing seals cause repeated adhesive stripping — the more the dressing leaks, the more often it is changed, the worse the skin gets |
| Irregular contour | Fistulae rarely sit on a flat plane. Scars, retracted incisions, drain sites, and wound edges all create channels for effluent to track |
The result is a vicious cycle: leakage causes skin damage, damaged skin will not hold a barrier, and the barrier fails sooner, so it leaks more. Breaking that cycle requires fixing the seal, not just treating the skin.
Treating the Skin
The Crusting Technique
This is the foundation, and it is identical to peristomal practice.
- Cleanse gently with warm water or normal saline; pat dry.
- Dust hydrocolloid powder onto the moist, denuded areas only — never onto intact skin.
- Brush off all loose excess. Powder left loose becomes a slurry that prevents adhesion.
- Seal with a non-alcohol liquid barrier film and let it dry fully.
- Repeat the powder-and-seal cycle 2 to 3 times to build a thin, dry, flexible crust.
Warning: Use non-alcohol barrier film on denuded skin. Alcohol-containing formulations cause severe stinging on an open surface and are a common reason patients refuse to continue a plan that would otherwise have worked.
Other Skin Measures
- Silicone-based liquid barriers and silicone dressings for very fragile or steroid-thinned skin.
- Antifungal powder applied under crusting for perifistular candidiasis; never a cream or ointment, which destroys adhesion.
- Silicone adhesive remover at every change to prevent cumulative adhesive stripping.
- Do not use petrolatum, zinc paste, or barrier creams where a pouch or dressing must adhere; they are appropriate only where nothing needs to stick.
The Containment Ladder
Escalate deliberately. The most common error is persisting with dressings when output has outgrown them.
| Output / situation | Option | Notes |
|---|---|---|
| Low output, < 200 mL/24h, intact skin | Absorptive dressing — alginate, hydrofiber, foam | Simplest and least costly. Change frequency drives skin damage, so if it needs changing more than 2 to 3 times daily, escalate |
| Moderate to high output, manageable contour | Ostomy pouch sized to the opening | Contains, measures, controls odour, protects skin, and lets the patient move |
| Large or irregular opening, or a fistula in a wound | Wound manager / fistula pouch with an access window | The window allows the wound bed to be dressed without breaking the seal — a decisive advantage |
| Very high output | Pouch with a drainage tap connected to a bedside bag | Prevents the weight of accumulated effluent from breaking the seal |
| Fistula in an open granulating wound | Isolation technique — seal the fistula into its own pouch and manage the wound separately, with NPWT if ordered | The "stoma-in-a-wound" approach covered in the fistula management section |
| Two openings close together | Bridging with barrier rings or strips to separate them, or pouch both together if effluent is similar | Bridging protects an incision from an adjacent fistula |
| Fistula adjacent to a wound that must stay dry | Trough technique — channel effluent away using strips of barrier and transparent film, directing flow to a pouched collection point | Useful when the opening is too flush to pouch directly |
Managing Contour
- Moldable barrier rings fill dips and create a raised collar around the opening — the workhorse.
- Strip paste fills long linear defects such as a dehisced incision line.
- Alcohol-free paste as a caulking agent, remembering it is grout and not glue.
- Barrier film over intact skin before applying anything adhesive.
- Wound filler — alginate or hydrofiber — packed into deep areas away from the fistula opening so the wound bed stays managed while the fistula stays isolated.
Important: Set the pouch or wound manager while the patient is in the position they spend most time in. An abdominal contour that is flat supine may be a deep valley when the patient sits up, and a seal built in the wrong position fails within hours.
Perifistular Complications and Their Management
| Complication | Presentation | Management |
|---|---|---|
| Irritant dermatitis / MASD | Bright red, denuded, mirrors the leak pattern | Fix the seal; crusting technique |
| Candidiasis | Confluent erythema with satellite pustules, itching | Antifungal powder under crusting |
| Hypergranulation | Friable beefy-red tissue rising above the margin, bleeds easily | Silver nitrate cautery, protect surrounding skin with petrolatum, reduce friction, foam dressing |
| MARSI | Stripping, tension blisters, tears | Silicone remover, low-angle removal, reduce change frequency by fixing the seal |
| Maceration | White, boggy, over-hydrated skin | Improve containment; barrier film; more absorptive dressing away from the seal line |
| Non-healing atypical lesion | Indurated, irregular, fails to respond | Biopsy — consider malignancy, particularly in an irradiated field |
Warning: Silver nitrate is appropriate for focal hypergranulation with the surrounding intact skin protected. It is not appropriate for a lesion that might be malignant, for bleeding varices, or as a blanket treatment for a broadly friable wound bed. If tissue is atypical or fails to respond, the next step is biopsy, not more cautery.
Nutrition and Odour, Briefly
Two supportive measures belong in the containment conversation because patients raise them constantly:
- Nutrition is not a side issue. Protein requirements rise to roughly 1.5 to 2.0 g/kg/day with a high-output fistula, and albumin, prealbumin, and weight trends should be tracked. A patient who is not being fed adequately will not heal a fistula or a wound no matter how good the pouching is.
- Odour is controlled by an intact seal first, then by pouch deodorants, charcoal filters where appropriate, and attention to a soiled outlet. Odour escaping a well-sealed pouch means the seal is not intact.
The measure of success is simple and worth stating to the patient: the seal lasts long enough that the skin gets a rest. A containment system that holds for 2 to 3 days lets denuded perifistular skin re-epithelialize; one that fails twice a day never will.
A fistula draining 350 mL per 24 hours is being managed with foam dressings that require changing five times daily, and the perifistular skin is now denuded. What is the most appropriate change in plan?
When performing the crusting technique on denuded perifistular skin, why must loose excess powder be brushed away before applying the barrier film?
Friable, beefy-red tissue has developed at the margin of a chronic fistula opening and bleeds with every dressing change. Which management approach is appropriate?
A fistula opening lies 2 cm from a midline incision that must remain dry. The opening is too flush to pouch directly. Which technique best addresses this problem?