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Silver Dressings in Wound Care: What They Do and When They Are the Right Choice
A silver dressing is not a better dressing. It's a dressing for one problem, infection in a wound or a high risk of it, and its use is meant to be reviewed. That framing comes from a 2012 international consensus on silver dressings, and it changes how you start, check and stop one.
What does a silver dressing do?
A silver dressing carries silver that becomes active as silver ions when it meets wound fluid, and those ions act against bacteria in the dressing and at the wound surface. A 2012 international consensus reserves silver for wounds that are infected or at high risk of infection, used for an initial two-week period and then reassessed.
Metal silver is unreactive. The consensus explains it works once it becomes silver ions, which happens more readily in wound exudate, and those ions bind to bacterial cell membranes and disrupt the cell. Silver sits on the dressing surface, where it touches the wound, or inside the structure, where it acts on bacteria drawn in with fluid.
The consensus also states that silver delivered to a wound does not correlate with silver contained in the dressing, because the ions react with chloride and proteins in the wound. More silver on the label is not, on that basis alone, a stronger dressing.
When a silver wound dressing is the right choice
The consensus, Appropriate use of silver dressings in wounds (Wounds International, 2012), gives silver two jobs. One is reducing bioburden in wounds that are infected or being prevented from healing by microorganisms. The other is acting as an antimicrobial barrier for wounds at high risk of infection or re-infection. It was developed by Wounds International with an unrestricted educational grant from B Braun, Convatec and Systagenix.
High-risk examples "may include burns, surgical wounds, pressure ulcers near the anus, wounds with exposed bone, or wounds in patients who are immunocompromised, have poor circulation, unstable diabetes or neoplastic disease." Used this way, the consensus asks for the reason to be documented and reviewed regularly, for example every two weeks.
Its list of when not to use silver includes wounds without signs of localised, spreading or systemic infection, clean surgical wounds at low risk of infection, chronic wounds healing as expected for the person's age and health, and small acute wounds at low risk of infection.
Infection in a chronic wound can be hard to spot. The signs the consensus lists include new, increased or altered pain, stalled healing, a change in odour, and altered or purulent exudate, and other health conditions can suppress the signs of inflammation. That's why starting a silver dressing for wounds is the assessing clinician's call, not the call of whoever opens the dressing cupboard.
The two-week challenge for silver dressings
For infected wounds, the 2012 consensus recommends initial use for a two-week "challenge", a window in which to assess whether the silver dressing is working. At the review it sets out three outcomes:
- Improved, but signs of infection continue: it may be clinically justifiable to continue silver, with further regular reviews.
- Improved, and the signs of infection have gone: the silver dressing should be discontinued.
- No improvement: the silver dressing should be discontinued and consideration given to a dressing with a different antimicrobial agent and, if the patient is unwell, a systemic antibiotic and re-evaluating possibly untreated comorbidities.
The International Wound Infection Institute's 2022 consensus update, Wound Infection in Clinical Practice, groups silver with other topical antiseptics and says duration of use should be individualised and based on regular wound assessment. It says a two-week challenge is often recommended, because it gives the agent time to show some observable activity, and that under its step-down/step-up approach to biofilm-based wound care, treatment may be required for up to four weeks to attain results. Its practice point is to use a topical antiseptic for at least two weeks before evaluating its efficacy in managing wound infection. Read together, the two-week review is where the plan is evaluated, not a fixed end date for every wound.
Once bioburden is under control and the wound is improving, the 2012 consensus says a non-antimicrobial dressing should be considered. For a facility, the review date belongs on the care plan the day silver starts, so silver doesn't become the standing dressing for a wound that no longer needs it.
Silver dressing forms and how they differ
The consensus says choice turns on factors including exudate level, the wound bed, whether a secondary dressing is needed, and patient preference. The forms in our silver dressings range line up like this.
Silver foam. Mepilex Ag and Mepilex Border Ag (Molnlycke) are foam pads with silver. Check each product's instructions for use (IFU) for the wounds it is indicated for.
Silver hydrofiber. Aquacel Ag Extra (Convatec) is a gelling fibre of sodium carboxymethylcellulose impregnated with ionic silver, which forms a gel as it absorbs fluid. Convatec positions it for moderately to highly exuding wounds, a clear example of a silver impregnated dressing. Our piece on foam vs hydrofiber dressings covers foam against fibre more generally.
Silver alginate. Melgisorb Ag (Molnlycke) is a silver-containing alginate that gels as it absorbs. Its IFU sets out the wounds it is indicated for.
Nanocrystalline silver. Acticoat Flex (Smith & Nephew) is a flexible knitted layer carrying nanocrystalline silver, which the consensus defines as elemental silver in crystals about 10 to 100 nanometres across. It comes in Flex 3 and Flex 7 versions, and the IFU for each sets its wear time.
A small, clean household cut in an otherwise healthy person is the kind of small acute wound at low risk of infection that the consensus lists among the places silver isn't needed.
Cautions before you use a silver dressing
The consensus's when-not-to-use list also covers people sensitive to silver or any component of the dressing, wounds being treated with enzymatic debridement, and pregnancy or lactation. It advises caution in children, saying silver dressings should not be used for more than two weeks without good clinical reasons. Dressings containing silver sulfadiazine carry their own exclusions, including sensitivity to sulfonamide antibiotics.
The consensus also notes that some manufacturers recommend their silver dressings are not used during MRI, or on or near body sites undergoing radiotherapy. Check the IFU for the dressing in place before the appointment and tell the imaging or radiotherapy team it's there.
If the skin around a silver dressing looks grey or stained, the consensus says silver dressings occasionally cause local discolouration or staining that is harmless and usually reversible. It is not true argyria, which the consensus describes as rare and usually related to swallowing silver solutions.
Silver vs other antimicrobial dressings
Iodine products such as Iodosorb (cadexomer iodine) and Inadine sit beside silver in our antimicrobial dressings range, and PHMB and medical honey are other agents used in wound dressings. The two-week outcomes are why that range matters: where silver hasn't helped, the consensus points to a dressing with a different antimicrobial agent rather than continuing silver.
When to get the wound seen
If you're caring for someone with a silver dressing at home, ask when it's due for review and who is doing it. Get the wound seen by their doctor, nurse or wound clinic sooner if redness is extending from the wound edge, the wound is breaking down, pain is new or getting worse, or the person has a fever or seems generally unwell. For spreading and systemic infection, the consensus indicates systemic antibiotics alongside topical antimicrobial dressings. If the person is seriously unwell, call triple zero (000).
Silver dressings for facilities and clinics
We supply silver dressings from Convatec, Molnlycke and Smith & Nephew side by side, so the choice can follow the wound, not one catalogue. When a product arrives from a supplier and doesn't meet standard, we pull it before it reaches a customer. If you need help choosing a silver format, call the team; whether a wound needs silver stays with the clinician.
For the wider picture, see our guide to wound dressings in Australia, our article on dressings for chronic wounds, and advances in wound dressing technology.
Compare silver dressings in our silver dressings range. Facilities and clinics buying in volume can call 03 5443 2239 or email info@firstaiddistributions.com.au.