domingo, 22 de diciembre de 2019

Antibiotic Resistance Influence on Wound Care

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By Dr. Liji Thomas, MDReviewed by Susha Cheriyedath, M.Sc.

Antibiotic resistance is one of the factors which causes delay in wound healing and a corresponding spike in medical and healthcare expenses.

The primary reason for the emergence of resistance is the inappropriate use of antimicrobials. To use antibiotics wisely, it is necessary to understand the principles of diagnosing wound infection, what organisms are likely to be responsible, and to what antimicrobial agents they respond.

This knowledge will help to ensure that antibiotics are used only when essential, and in a manner that does not cause more resistance to be generated.

Antibiotic resistant bacteria inside a biofilm. Image Credit: Kateryna Kon / Shutterstock

Measures to Prevent Antibiotic Resistance

Prevention of Inappropriate Antibiotic Use

To prevent the emergence of resistance, the following practices are recommended:

Removing dead and unhealthy tissue from wounds (wound debridement) with copious irrigation to flush out toxins and other agents which prevent speedy healing
Restriction of systemic antibiotics to situations where spreading infection is manifest in subcutaneous tissue, or is ascending up a limb, or shows signs of severe widespread infection
Use of more specific antibiotics depending on the type of organism expected in the wound, rather than broad-spectrum antibiotics, to reduce the chances of selecting resistant skin and gut organisms for survival
Use of empirical antibiotics based on wound cultures
Use of topical antibiotics
Testing new antibiotics for the possibility of the development of resistance
Research on other potential methods to control infection in wounds

The gravity of antibiotic resistance in wound care is well established, and many wound cultures, especially from chronic wounds caused by vascular insufficiency, show multiple bacterial strains which are resistant to common antibacterials.

In such cases, repeated cultures become a vital tool to monitor the emergence of resistant strains in the community. The wound surgeon, the microbiologist, and other specialists in community medicine must collaborate to get early culture results and use them to select the right antimicrobial therapy.

The change in resistance patterns in the community makes the availability of local epidemiologic studies an important factor in choosing the right empirical therapy.

A common misconception which has led to excessive antibiotic use in chronic non-healing ulcers is the attribution of the slow recovery to bacterial infection, whereas it is the disrupted vascular pattern which is to blame. Thus, avoiding the use of antibiotics in this population of patients is likely to create a significant reduction in antibiotic resistance.

Newer and more effective approaches which focus on removal of the biofilm and encouraging physiological conditions in the wound area will reduce the healing time and the need to resort to antibiotics in this segment.

Prevention of Spread of Existing Resistant Strains

However, other steps need to be taken to isolate the resistant strain and prevent its transmission to others, both patients and staff. These include:

Proper handwashing and hygiene measures after seeing or handling one patient
Isolation facilities for patients with resistant wound infection
Barrier nursing to prevent the carriage of infection from one person to another
Personal protection kits
The use of equipment set aside for such patients and needs alone
Careful waste disposal and other means to avoid environmental contamination

These must be exploited in full measure to keep antibiotic-resistant microbes from spreading inside and beyond the hospital.

Topical Antimicrobials in Wound Care

Topical antimicrobials, unlike antibiotics, act at multiple sites to inhibit or destroy target cells, and this means that resistance is rare. Thus the use of topical agents to arrest bacterial growth in wounds is an area of immense potential in wound care, reducing bacterial counts without resorting to antibiotics.

The use of topical antibiotics is another option but this requires sound clinical experience and specific wound criteria. For instance, foul-smelling open wounds may benefit from one topical agent while burns may require another type. At the same time, the adverse effects of topical antimicrobials must also be rigorously assessed, as blood dyscrasias have been reported with some commonly used preparations.

Silver, cationic antimicrobials, and quaternary ammonium compounds are all examples of effective skin antiseptics which are proven to be useful in wound care without the need for antibiotic use.

In short, antibiotics should be used to treat bacterial infection only when indicated by appropriate guidelines, and antiseptics should be given increased priority in wound care. This will create antimicrobial barriers while cutting down the bacterial counts in the wound, and reduce the chances of antibiotic resistance as well.