THE NEW APPROACH OF PERMANENT ENDOCARDIAL LEAD EXTRACTION

An attempt to describe some tactical and technical particularities of the new approach of permanent endocardial lead extraction has been made. Extracorporal circulation is used for direct visual control of targeted leads. Additional recommendations for clinical application of new surgical technique are formulated. High efficacy, reproducibility and low rate of complications have been confirmed

Scaling Analysis of Defect Induced Structure of A6061 Alloy at Dynamic Strain Localization

Plastic strain localization and fracture of dynamically loaded metallic samples, occurred during plug formation, are investigated. These processes are closely related to the instability of plastic flow and can be attributed to structural-scaling transitions in mesodefect ensembles. The multiscale nature of defect structure allows us to use the fractal concept for quantitative analysis of both the fracture surface and the inner structure of a deformed material. The scaling properties of fracture surfaces are established in terms of the roughness index (Hurst exponent) as the characteristics of strain localization and fracture

Evaluation of naked oat accessions from the VIR collection for their qualitative characteristics in Kazakhstan

Background. The grain of naked oat varieties has a unique biochemical composition (increased content of protein, starch, fat, and β-glucans) for the production of high-quality dietary food and feed. Relatively low adaptability restrains the spread of naked oat cultivars, but the demand for them has been increasing from year to year. Currently, only hulled oat cultivars are introduced into industrial cultivation in Kazakhstan, so the breeding trend aimed at the development of high-yielding naked oat cultivars may be regarded as a priority.Materials and methods. Thirty-five accessions of naked oats (Avena  sativa L.  subsp. nudisativa (Husnot.) Rod. et Sold.) were selected from the germplasm collection of the N.I. Vavilov All-Russian Institute of Plant Genetic Resources (VIR) for their suitability for the conditions in Kazakhstan in terms of the growing season, drought resistance and grain productivity. The study was carried out in 2015–2017 in the fields of the Kazakh Research Institute of Agriculture and Crop Production (Almaty) and the Karabalyk Agricultural Experimental Station (Kostanay). Grain quality of naked oats was assessed by various methods according to a set of biochemical characters: the content of protein and its fractions, starch, amylose, fat and fatty acids, and β-glucans.Results. The study of naked oat accessions from VIR in the environments of the southeastern Kazakhstan showed higher average values of protein content in grain than under the conditions in the north. As a result of the study, naked oat accessions with increased and stable indicators of the content of protein, starch, amylose, fat, individual fatty acids and β-glucans were identified for the conditions of the southeastern and northern regions of Kazakhstan. All selected accessions will be used in breeding programs of the Republic of Kazakhstan to develop high-yielding and high-quality naked oat cultivars

Dosed Walking: Under Sign of Health Improving and Rehabilitation

Here is shown on the base of the foreign literature review that walking could cause not only positive, but also negative effects. The last one are the result of discrepancy of walking parameters to person’s trained level in the case of inobservance of individualization principle. In this connection in article the methodology of drawing up of medical-improving programs of the dosed walking and efficiency of their use is discussed

THE NEW APPROACH OF PERMANENT ENDOCARDIAL LEAD EXTRACTION

Purpose: to explore results of chronically implanted endocardial pacemaker leads extraction with extracorporeal circulation and using sternotomy pump off approach.Methods: bacteriological analysis and electronical microscopy of deimplanted pacing leads were estimated. The short-distance outcomes of surgical treatment are analyzed too.Results: 26 patients were operated and 59 leads extracted. The vast majority of infectious agents were presented by Streptococcus viridians and Staphylococcus epidermidis. One patient had early postoperative bleeding. Another case was complicated by relapse of infection. There wasn’t mortality observed.Conclusion: the pump off approach of extracorporeal circulation is a safe and effective method for endocardial pacemaker leads extraction

THE ALTERNATIVE APPROACH FOR PACING LEADS IMPLANTATION AND EXTRACTION

Analysingthe example of unusual case of a successful direct constant His bundle pacing, we would like to draw specialist’s attention to details of procedure and some important electrophysiological particularities we have come across during operation. Long-term (7 years) results ( pacing options, ECG data, changes of left ventricle ejection fraction and patient’s quality of life) were considered too

Continuous dielectric permittivity II: An Iterative Method for Calculating the Polar Component of the Molecular Solvation Gibbs Energy Under a Smooth Change in the Dielectric Permittivity of a Solution

An iterative method for calculating the polar component of the solvation Gibbs energy under a smooth change in dielectric permittivity, both between a substrate and a solvent and in a solvent is formulated on the basis of a previously developed model. The method is developed in the approximation of the local relationship D = \eps (r) E between the displacement vectors D and the electric field intensity E.Comment: 36 pages,3 Figures, in English and in Russia

FIRST EXPERIENCE OF DIRECT CONSTANT HIS BUNDLE PACING

Objective: to study electrophysiological parameters and clinical results of direct constant His bundle pacing (HBP). Materials and methods: we examined 36 patients, divided into 2 equal groups (of 18 patients) according to the type of pacing. Group 1 included patients with atrial lead delivery and group 2with ventricle lead delivery. Within 12 months after implantation of the pacemaker were evaluated pacing options, ECG data, changes in heart cavities sizes, quality of life assessments with the MOS SF-36. Results: it turned out that in group 1 QRS duration was 111±13 ms, whereas QRS duration in group 2 was 134±19 ms. So QRS duration and morphology corresponded to physiological and excluded uprising of ventricle dyssynchrony, LV diastolic dysfunction and chronic heart insufficiency, quality of life were higher for group 1 paients : 71±8,5 whereas 63±9,9 in group 2. Conclusions: implantation atrial lead in His-bundle provides more reliable fixation, less early dislocation risk in early postoperative period and facilitates lead extraction. Clinical implementation of this method will contribute Russian industry, which is especially important in import substitution conditions, to the creation of special lead, delivery system and DDDR pacemaker with a backup ventricle channel

THE EFFECT OF CHEMICAL COMPOSITION ON THE DENSITY OF THE TITANIUM ALLOY

В работе методом гидростатического взвешивания показано изменение плотности в двухфазном титановом сплаве типа VST2 различного химического состава. Установлено, что величина плотности в сплаве закономерным образом связана с легированием через соотношение в нем содержания α-стабилизатора (алюминия) и суммарной концентрации β-стабилизирующих элементов.By hydrostatic weighing technique the effect of alloying elements on density of two-phase titanium alloy was studied. It has been established that the density of the alloy is connected with the chemical composition in terms of a ratio of aluminum and total β-stabilizers content.Работа выполнена при финансовой поддержке постановления № 211 Правительства Российской Федерации, контракт № 02.A03.21.0006, в рамках государственного задания Министерства образования и науки РФ, проект № 11.1465.2014/К