Varying Negative Pressure Wound Therapy Acute Effects on Human Split-Thickness Autografts.

Over 6.5 million people in the United States suffer from traumatic, burn, acute, and chronic wounds yearly. When reconstruction is required, split and full-thickness autografts are a first line of treatment intervention. Negative pressure wound therapy (NPWT) is gaining traction as an adjunct modality to improve graft survival, yet the specifics on what settings to apply topically over the graft is unsubstantiated and associated with morbidities. This study was performed in an effort to understand initial changes in wound and graft healing with a long-term goal of surface pressure optimization. Excess skin from elective procedures from six human subjects was trimmed to 0.012 inch in order represent a split-thickness autografts. These grafts were treated continuously with either -75 mm Hg (n = 4), -125 mm Hg (n = 4), or no pressure (n = 4) for 3 hours. Six skin grafts were treated with no sponge or pressure control (n = 6). RNAseq was performed on all treatment groups and compared with no pressure control. Significant gene expression changes with a subset focusing on inflammatory, cellular/extracellular matrix proliferation and angiogenic mediators and having greater than 2-fold were confirmed with immunohistochemistry staining. There are 95 significant gene transcription differences among all treatment groups. NPWT leads to significantly increased gene expression of FGFR1, ET-1, and 22 Keratin proteins. Between -75 and -125 mm Hg groups, there are 19 significant gene changes. Proinflammatory genes S100A8 and Tenacin C (TNC) demonstrate an 8.8- and 9.1-fold change, respectively, and is upregulated in -125 mm Hg group and downregulated in -75 mm Hg group. Fibrinogen genes fibrinogen gamma chain and fibrinogen alpha chain had respective log2-fold changes of -7.9 and -7.4 change between treatment groups and were downregulated in -125 mm Hg group and upregulated in -75 mm Hg group. There are varying effects of surface pressures on human split-thickness autografts during the imbibition time period. NPWT may improve cellular migration, proliferation, and angiogenesis over controls. Human skin grafts respond differently to -125 and -75 mm Hg within 3 hours of NPWT treatment. The results suggest -75 mm Hg leads to less inflammation and increased fibrinogen production compared with the -125 mm Hg group, at least initially. Reducing "time to heal" with NPWT is critical to successful outcomes and quality of life within young patients who often experience pain/discomfort when treated at the current standard pump settings. The results from this study and continued investigation may quickly translate to the clinical setting by finding the ideal pressure setting utilized in an effort to reduce NPWT length of treatment, improve patient comfort, satisfaction, and psychosocial well-being.

An algorithmic approach to the use of gauze-based negative-pressure wound therapy as a bridge to closure in pediatric extremity trauma.

BACKGROUND: The efficacy of negative-pressure wound therapy as a bridge to definitive closure of traumatic extremity wounds has been demonstrated in adults. Gauze-based negative-pressure wound therapy has been used to facilitate granulation tissue formation and promote closure in a number of wound types. In this study, the authors evaluated the efficacy of gauze-based negative-pressure wound therapy using the Chariker-Jeter technique for pediatric extremity wounds requiring delayed closure. METHODS: A retrospective review was conducted of 24 pediatric patients presenting with extremity injuries involving soft-tissue defects not amenable to immediate primary closure. After initial irrigation, débridement, and antibiotic therapy, negative-pressure wound therapy using the Chariker-Jeter technique was applied and dressings were changed at 48- to 72-hour intervals before secondary closure or primary closure by skin graft, local flaps, or free tissue transfer. RESULTS: Granulation tissue was noted in all wounds by day 4. The duration of vacuum therapy averaged 10 days in patients whose wounds were closed primarily (n = 19) and 17 days in patients who were allowed to heal by secondary intention (n = 5). Nine patients' wounds were closed with skin grafts and local flaps, eight were closed with local flaps only, and three were closed with free tissue transfer. There was no incidence of skin graft loss or flap failure. Follow-up evaluation of the wounds averaged 24 months, during which no complications were noted. CONCLUSIONS: As a relatively atraumatic wound care technique with few complications, gauze-based negative-pressure wound therapy with the Chariker-Jeter technique provides a highly effective option for temporary soft-tissue management of extremity trauma in pediatric patients.