Limited added value of negative pressure wound therapy compared with calcium alginate dressings for second intention healing in a noncontaminated and contaminated equine distal limb wound model.
Abstract: Distal limb wounds in horses often show aberrant healing due to a slow inflammatory response. In human medicine, negative pressure wound therapy (NPWT) is used for the treatment of chronic wounds with a similar inflammatory response. Objective: To compare the effect of NPWT to calcium alginate dressings on the healing of (non) contaminated equine distal limb wounds. Methods: Controlled experiment. Methods: Circular wounds were created on the left and right dorsomedial metacarpus of 10 horses. In five horses, the wounds were contaminated with Staphylococcus aureus and Pseudomonas aeruginosa. In all horses, one limb was treated with NPWT, the other with calcium alginate dressings. Treatments were applied during nine days for noncontaminated wounds and six days for contaminated wounds. Noninvasive (clinical assessment, bacteriology swabs, thermographic images and wound dimensions) and invasive (biopsies for histology and growth factor analysis) measurements were taken regularly for 71 and 29 days respectively. Effects of selected parameters on continuous dependent variables were analysed using ANOVA, while for discrete dependent variables, logistic regression was applied. Results: In noncontaminated wounds, there was significantly less wound retraction in the early healing stages when treated with NPWT (mean difference [95% CI] = 19.2% [13.3%-25.1%]; P = .005), although wound size was not significantly different between NPWT and control wounds at later healing stages. Noncontaminated control wounds had a significantly higher neutrophil influx (OR [95% CI] = 1.99 [1.49-2.66]; P < .001) and lower macrophage influx (OR [95% CI] = 0.75 [0.60-0.93]; P = .008) compared with NPWT-treated wounds. Bacterial load and the presence of growth factors did not differ between treatments in noncontaminated wounds. In contaminated wounds, no differences between treatments were observed in wound size, histological parameters, bacterial load or growth factor concentration. Conclusions: Sample size is small. Conclusions: No long-term advantage was detected with NPWT compared with calcium alginate dressings in noncontaminated or contaminated equine distal limb wounds healing by second intention.
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The study compared the efficiency of Negative Pressure Wound Therapy (NPWT) and calcium alginate dressings in healing noncontaminated and contaminated distal limb wounds in horses. It concluded that NPWT had no significant long-term benefit over calcium alginate dressings in the healing of such wounds.
Research Methodology
The study was a controlled experiment involving 10 horses.
Noncontaminated and contaminated wounds were created on the left and right dorsomedial metacarpus of the horses.
For five horses, the wounds were contaminated with Staphylococcus aureus and Pseudomonas aeruginosa.
In all the horses, one limb was treated with NPWT, and the other with calcium alginate dressings.
The treatments were applied for nine and six days for noncontaminated and contaminated wounds, respectively.
Both noninvasive (clinical assessment, bacteriology swabs, thermographic images, wound dimensions) and invasive (biopsies for histology and growth factor analysis) measurements were taken over different periods.
The potential effects of certain factors on the variables were analysed using ANOVA and logistic regression techniques.
Research Findings
In the case of noncontaminated wounds, there was significantly less retraction in the early stages of healing with NPWT, but wound size was not significantly different between NPWT and control wounds at later stages.
Noncontaminated control wounds showed a significantly higher neutrophil influx and a lower macrophage influx when compared to NPWT-treated wounds.
There was no significant difference between bacterial load and the presence of growth factors in noncontaminated wounds treated by both methods.
In the case of contaminated wounds, no significant differences were observed in terms of wound size, histological parameters, bacterial load or growth factor concentration.
The study concluded that there was no significant long-term advantage of using NPWT over calcium alginate dressings in the healing of noncontaminated or contaminated equine distal limb wounds healing by second intention.
Study Limitations
The study had a small sample size, which could impact the reliability and generalisability of the results.
Cite This Article
APA
Haspeslagh M, Van Hecke LL, Hermans K, Chiers K, Pint E, Wilmink JM, Martens AM.
(2021).
Limited added value of negative pressure wound therapy compared with calcium alginate dressings for second intention healing in a noncontaminated and contaminated equine distal limb wound model.
Equine Vet J, 54(3), 592-600.
https://doi.org/10.1111/evj.13487
Department of Surgery and Anaesthesiology of Domestic Animals, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.
Van Hecke, Lore L
Department of Surgery and Anaesthesiology of Domestic Animals, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.
Hermans, Katleen
Department of Pathology, Bacteriology and Poultry Diseases, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.
Chiers, Koen
Department of Pathology, Bacteriology and Poultry Diseases, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.
Pint, Eva
Department of Surgery and Anaesthesiology of Domestic Animals, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.
Wilmink, Jacintha M
Woumarec, Wageningen, The Netherlands.
Martens, Ann M
Department of Surgery and Anaesthesiology of Domestic Animals, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.
MeSH Terms
Alginates
Animals
Bandages / veterinary
Horses
Intention
Negative-Pressure Wound Therapy / methods
Negative-Pressure Wound Therapy / veterinary
Wound Healing
Grant Funding
01D25512 / Ghent University Special Research Fund
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