The overuse and inappropriate use of systemic antibiotics is the most serious cause of problems associated with the increasing resistance of bacterial pathogens. What served as the basis for WHO to call the XXI century “The era of antibiotic resistance”. The wide spread of resistant strains of microorganisms, the growth of severe and complicated forms of diseases leads to an increase in the frequency of unfavorable treatment outcomes. In the Russian Federation, an increase in the incidence of acute rhinosinusitis from 4.6 to 12.7 cases per 1000 population has been noted in the last decade. The incidence of acute rhinosinusitis in Europe is recorded in 6.4 ± 3.6 of all cases of visits to primary care physicians. Up to 38% of outpatients in the ENT profile suffer from various forms of otitis media, including up to 30% of acute otitis media. The most important way to overcome the global problem of antibiotic resistance, along with the delayed use of systemic antibacterial drugs initiated by the world medical community, is to switch to the active use of topical drugs with antimicrobial activity. The article provides an overview of the data of domestic and foreign literature on the properties of a topical antibacterial drug with the active ingredient hydroxymethylquinoxaline dioxide. The results of experimental work and clinical studies, proving the high efficacy and safety of the drug in the complex treatment of bacterial infections of the upper respiratory tract, have been analyzed.

Introduction. The problem of phonosurgery remains relevant today since the prevalence of benign and tumor-like laryngeal lesions is up to 55%–70% among diseases of the upper respiratory tract. Photoangiolytic lasers are actively used among laser systems in phonosurgery today. A new 445 nm surgical laser (TruBlue, A.R.C. Laser Company), having a high hemostatic and resection effects, was certified for the medical market in 2018. TruBlue laser operation is possible in an atmosphere of inert gas (helium) by connecting the optional Flow Control unit. To date, there are very few works in foreign and Russian literature devoted to the use of that laser device in ENT practice, particularly, in laryngology. Objective. To select the optimal 445 nm laser mode for use in phonosurgery based on an experimental study of biological material. Material and methods. An experimental study was conducted on a model of the larynx (chicken muscle tissue) using a 445 nm laser in contact constant and pulsed modes, including an atmosphere of an inert gas (helium). The zones of destruction, coagulation necrosis, and ischemia were measured by histological examination using a morphometry system. The total number of experiments was 142, the total number of micro-preparations studied was 284. Results. While working in continuous wave mode, we received an extensive zone of thermal exposure, which in clinical practice correlates with deep damage of the vocal fold and violation of its vibratory function. This confirms the axiom that the optimal mode for laryngeal surgery is a pulsed one. According to the evaluation results of the pulse mode at standard laser settings (without helium supply), the parameters with the smallest pause between pulses—that is, 8 W pulse 10–20 ms, 9–10 W pulse 10 ms with a pause of 150 ms—were the most optimal for practical activity in terms of combined resection and coagulation effect. These parameters are acceptable for use in phonosurgery since the maximum destruction zone does not exceed 600 nm. While working in an inert gas atmosphere, we recommend using a laser at a power of 6–8 W with a pulse duration of 10 ms and a pause of 100–130 ms; with an increase in the pulse, lengthen the pause 6–7 W 20 ms 120–130 ms, 8 W 20 ms with a pause of 130 ms. Conclusion. During the experiment, blue laser showed high resection and coagulation effects. According to the results of the study, the parameters of laser exposure were obtained, which are optimal for the surgical treatment of benign and tumor-like laryngeal lesions.

The issues of surgical treatment of bilateral paralytic stenosis of the larynx do not lose their relevance today, since the proportion of patients suffering from this pathology is steadily increasing. Neurogenic disorders of laryngeal motor function most often occur due to previous surgical intervention on the thyroid gland and upper mediastinum. The predominant complaints of such patients are dyspnea, decreased tolerance to physical exertion and impaired lantern function. Thus, the main objectives in the treatment of chronic laryngeal stenosis are: restoration of the lumen of the vocal slit to ensure adequate respiratory function, prevention of respiratory failure and preservation of socially significant voice. The use of semiconductor lasers for laryngoplasty in bilateral paralytic stenoses of the larynx is a very common technique, however, there are no data in the literature on the use of semiconductor laser energy with a wave length of 445 nm for this surgical intervention. In their work the authors tried to show the advantages of the surgical treatment of bilateral paralytic laryngeal stenosis using 445 nm semiconductor laser, developed at the Saint Petersburg Research Institute of Ear, Throat, Nose and Speech, which allowed to reduce rehabilitation period of respiratory function and preserve socially significant voice, using a clinical example.