Modern approaches to the treatment of trophic ulcers of venous etiology: photodynamic therapy

Chronic venous insufficiency, being the outcome and complication of most diseases of the veins of the lower extremities, is the fundamental cause of the formation of trophic ulcers. Over the past decade, in solving the problem of treating venous trophic ulcers, certain successes have been achieved, both in theoretical and practical terms. The modern concept of curation of patients with trophic ulcers of venous origin involves a reasonable combination of the following methods of treatment: local, including compression, as well as medical, surgical, minimally invasive and additional methods (physiotherapy, photodynamic therapy, etc.). The main goal of the treatment is to eliminate the ulcer, after which measures are taken to correct the underlying cause (chronic venous insufficiency) and prevent relapse. However, the tactics of the most successful treatment of patients with trophic ulcers of venous etiology is still not defined and requires further improvement. In particular, the method of photodynamic therapy, which includes the usage of special drugs - photosensitizers, also deserves to be studied and expanded for clinical use. The mechanism of photodynamic action is based on the ability of photosensitizers to accumulate in microbial and pathological cells. Under local light exposure, the photosensitizer enters an excited state and charges oxygen, which is associated with erythrocyte hemoglobin. Thus, in cells under the influence, a photochemical reaction is triggered, which ensures the formation of singlet oxygen and its free radicals. Reactive oxygen species, in turn, have a damaging effect on pathogenic flora and necrotic tissues. The main advantages of the method are relative simplicity, no risk of developing antibiotic resistance, acceleration of reparative and regenerative processes, and prevention of secondary infection. Thus, photodynamic therapy allows non-invasive, safe and effective optimization of local treatment and preoperative preparation of patients with venous trophic ulcers.