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Abtrakt (EN) In spite of the fact that the diabetic foot syndrome is not considered a marginal complication of the patients with diabetes mellitus any more, its prevalence and incidence is not decreasing. The fact that early diagnosis and treatment or even prevention of foot ulcers is associated with a decrease in healthcare costs and, more importantly, with reducing patients' suffering, applies also in this case. The dissertation work originated in the Diabetologic Center of the Medical department I., University Hospital and Medical Faculty in Pilsen, Charles University in Prague, which has been dealing with diagnostic and therapeutic procedures in patients with diabetic foot syndrome for over 20 years. The examinations for diagnosis of the main etiologic factors, i.e. peripheral neuropathy and impaired perfusion, belong to already routine ordinary procedures here. My task was to move the diagnostics of this complication to earlier stages, even before the development of the ulcers, through diagnosing an impairment in skin microcirculation. The aim of the work was to evaluate reactivity of the skin microcirculation in patients with diabetes mellitus using laser doppler flowmetry and to introduce a new method - iontophoresis. Skin microcirculation assessment has become a center of interest of many studies...