The research is designed to evaluate influence of transcutaneous application of CO2 (carbon dioxide) on chronic wound healing. Transcutaneous application of CO2 is known to have immediate effect on vasodilatation and elevates oxygen release from Hb via the Bohr effect. After repetition of the therapies neoangiogenesis is induced. Impairment of microcirculation is one of the causes of impared wound healing and improvement in circulation could have positive effect on wound healing, reduction of the wound area and granulation of the wound bed (Falanga score).
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Ratio of completely healed wounds
Timeframe: after 4 weeks of therapy with CO2 or standard of care