Evaluation of Systemic Effects of Negative Pressure Wound Therapy in Open Wound Treatment in Dogs

Abstract

Objectives The aim of this study was to evaluate the systemic effect of negative pressure wound therapy (NPWT) on the treatment of complicated wounds in dogs.

Materials and Methods Dogs undergoing open wound treatment were randomly assigned to one of two groups: NPWT (n = 11) or polyurethane foam dressing (n = 11). Rectal temperature, heart rate as well as haematocrit, thrombocytes, leucocyte count, band neutrophils, C-reactive protein (CrP), total protein and albumin were recorded daily from the beginning of therapy (day 0) until day 5, as well as on day 10. The effect of treatment on systemic parameters was evaluated as well as the prognostic power of the individual parameters with regard to successful wound closure.

Results A more profound systemic decrease was found in total protein under NPWT. This difference was non-significant. Patients with non-successful closure displayed a non-significant trend towards lower initial leukocyte and thrombocyte counts and significantly higher CrP values on days 4, 5 and 10 (p < 0.05) compared with successfully treated patients. Receiver operating characteristic analysis revealed an optimal cutoff value of 70.2 mg/L at day 4 (sensitivity 80; specificity of 85.7).

Conclusion There might be an increased loss of protein in NPWT-treated patients, which does not affect albumin levels, otherwise no systemic effects were detected compared with the control treatment. The parameter with the best sensitivity and specificity to detect serious complications (no wound closure achieved) was CrP at day 4.

Keywords

negative pressure wound therapy - polyurethane foam - C-reactive protein - prognostic values for wound closure

Author Contribution

Rebecca Albert and Mirja C. Nolff contributed to conception of study, study design, acquisition of data and data analysis and interpretation. Sven Reese contributed to data analysis and interpretation. Andrea Meyer-Lindenberg contributed to conception of study and study design. Rebecca Albert and Mirja C. Nolff and Andrea Meyer-Lindenberg drafted, revised and approved the submitted manuscript.

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