The objective: to assess the prevalence and structure of congenital malformations and anomalies of the chest organs and systems among adult population of the Kabardino-Balkarian Republic.Subjects. 1,729 patients with suspected respiratory tuberculosis examined from 2016 to 2021 inclusive in Differential Diagnostic Department of TB Dispensary by the Ministry of Health of the Kabardino-Balkarian Republic.Results. In 89 (5.1%) patients, congenital anomalies and malformations of the chest organs and systems were detected, 42/89 (47.2%) had one more concurrent respiratory pathology; oncological diseases (42.9%) and respiratory tuberculosis (23.8%) prevailed. In patients with malformations of the musculoskeletal system of the chest organs, tuberculosis was more often detected, oncological diseases were equally frequent in patients with malformations of the musculoskeletal system and mediastinum.

The objective: to analyze results of TBNA for diagnosis of mediastinal lymphadenopathy performed with flexible and rigid tracheobronchoscopy with needles of different diameters.Subjects and Methods. We analyzed data of 194 patients who underwent TBNA with fibrobronchoscopy (Group 1) or rigid bronchoscopy (Group 2) for mediastinal lymphadenopathy of uncertain etiology.Results. The overall diagnostic efficacy of the biopsy was 90,7%, while in case of tumors, the sensitivity was 89,5% and specificity was 97,5%, in case of respiratory sarcoidosis, they were 92,5% and 85,9%, respectively. Better diagnostic efficacy rates were observed in Group 1 (flexible bronchoscopy with 19G puncture needles) versus Group 2 (rigid bronchoscopy with 16G puncture needles) which may be due to the small number of biopsies in Group 2.

In this paper, we propose a method of creating a wave-like corrugated surface from graphene nanoparticles. Due to the Kelvin-Helmholtz instability, the graphene suspension flowing onto the melted paraffin forms a wave-like surface. The inhomogeneity wavelength λ can be controlled by changing the relative surface tension.