Inhomogeneous Magnetoelectric Effect on Defect in Multiferroic Material: Symmetry Prediction

Inhomogeneous magnetoelectric effect in magnetization distribution heterogeneities (0-degree domain walls) appeared on crystal lattice defect of the multiferroic material has been investigated. Magnetic symmetry based predictions of kind of electrical polarization distribution in their volumes were used. It was found that magnetization distribution heterogeneity with any symmetry produces electrical polarization. Results were systemized in scope of micromagnetic structure chirality. It was shown that all 0-degree domain walls with time-noninvariant chirality have identical type of spatial distribution of the magnetization and polarization.Comment: submitted to IOP Conference Series: Materials Science and Engineerin

Study of the dosing tissue distraction clinical efficacy in the soft tissue defects treatment of various etiologies in the lower extremities

Justification. The most methods of extensive skin and soft tissue defects are aimed at accelerating wound healing  and preventing infectious complications. To improve the effectiveness of such defects treatment, a method of dosed tissue distraction (MDTD) is used, consisting in the application of a continuously acting load to the area of healthy soft tissue in close proximity to the wound defect.Purpose. It performed the evaluation of the medico-social  effectiveness of the introduction into clinical practice of developed methods and devices for implementing MDTD in  the treatment of skin and soft tissue defects of the extremities.Methods. 407 patients were treated with wound defects of  the extremities, which were divided into two groups: the main group – 198 patients in whose treatment MDTD was applied using original methods and devices; comparison group – 209 patients, in whose treatment standard treatment methods were applied. Comparison of the long-term results of treatment according to the frequency of repeated operations, complications, indicators of quality of life, frequency of disability.Results. The use of MDTD is characterized by better performance compared with the use of standard approaches. There is a decrease in the frequency of performing reconstructive plastic surgery after inpatient treatment (9–10 times), remote complications by 2.6 times, a reduced value of the Vancouver scale (by 28.8%), quality of life indicators higher levels. The use of the proposed approach is characterized by a shorter duration of treatment (by 26.0%), duration of disability (1.4 times), cases of disability (2.2 times).Conclusion. The use of MDTD is characterized by high medical and social efficiency, allows to reduce the cost of treating extensive skin and soft tissue defects by reducing the length of hospitalization, the frequency of repeated rehabilitation and reconstructive operations, accelerated recovery of patients, improving the quality of life and reducing the incidence of disability

Effectiveness of Autologous Platelet-Rich Plasma and Stromal Vascular Fraction in Autologous Skin Grafting

Introduction: Despite the medical advances, burns remain a serious challenge and require new and promising treatment options, such as biomedical technologies with a high potential for burn wound treatment. However, high cost and complexity of biotechnologies limit their routine use, but autologous tissues, such as stromal vascular fraction (SVF) and autologous platelet-rich plasma (PRP), overcome these shortcomings.   Objective: To demonstrate a successful case of using a combination of adipose-derived SVF and autologous PRP during autologous skin grafting in a severely burned patient.   Material and methods: We present a successful case of 84-year-old Patient B. treated at Saint Petersburg I. I. Dzhanelidze Research Institute of Emergency Medicine in September-October 2022. He was diagnosed with a 11% (6%) / II-III degree flame burn of the head, neck, trunk, and upper extremities and first-degree inhalation injury. At the first stage, the general condition of the patient was stabilized, and he was prepared for surgery. At the second stage, on day 25 of treatment we performed skin grafting using split-thickness autografts with rare perforations and application of SVF and autologous PRP on a burn wound. We evaluated the treatment effectiveness using planimetry, cytology, and histology.   Results: We observed complete engraftment of the autograft with no lysis or rejection during the first dressing change on day 3 after surgery and complete skin restoration on day 11. Cytologic findings over time showed an active decrease in inflammatory cells and an increase in regenerative cells, indicating successful wound healing. Histology demonstrated formation of normal stratified squamous epithelium with areas of hyperkeratosis and young granulation tissue in the superficial layers of the dermis on day 6.   Conclusions: Our case demonstrated that the combination of SVF and autologous PRP facilitates split-thickness skin autograft engraftment

Vacuum Therapy in Complex Treatment of Purulent-Necrotic Diseases of Soft Tissues: Clinical Cases

Background. Radical surgeries for phlegmons, abscesses, necrotizing infection are often followed by extensive wounds which require an individual approach to their rapid closure by means of plastic surgery methods. In such a case, the optimal wound therapy is primary healing with the use of vacuum therapy.Cases description. The study involved three clinical trials of patients with acute purulent-necrotic diseases of soft tissues of various localizations, volumes and grades, for which vacuum therapy was used as a part of complex therapy. Surgical interventions are proved to be urgently performed in acute purulent-necrotic diseases. Early reconstructive skin and bone plastic surgery aimed at closing post-operative wound defects is also very important.Conclusion. In the demonstrated clinical cases, the purulent process was stopped and wound therapy was performed by means of primary healing, which undoubtedly ensures medical and social rehabilitation of such patients. Notably, vacuum drainage is not an independent method, but an important component in the complex active surgical treatment of purulent wounds