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Cholangioblastic variant of intrahepatic cholangiocarcinoma is a rare, extremely malignant liver tumor. Currently, only six clinical cases have been described worldwide. Following the bibliographic research, the authors of the paper introduced main features of the tumor, methods of its diagnosis and treatment. A clinical observation of a patient with cholangioblastic variant of intrahepatic cholangiocarcinoma is presented. The course of the disease was complicated by tumor thrombosis of the left hepatic and inferior vena cava with thrombus flotation in the right atrium. The paper describes the stages of the disease diagnosis and surgical treatment of the patient, providing insight into the patient surveillance in such cases. Given the low incidence of such neoplasms, each clinical case reported in the scientific literature is of great value and practical interest.

Research objective: establish the impact of Left Atrium Volume Index (LAVI) on on effectiveness of Thoracoscopic Ablation (TSA) in the Treatment of Atrial Fibrillation (AF) and define the risk factors for manifestation of supraventricular arrhythmias in the long-term follow-up resultsMethods. Prospective cohort study of 121 patients with AF (from 2018 to 2021) who performed TSA. The patients were divided into two groups: patients with increased LAVI (group I), patients with normal LAVI less than 34 ml/m2 (group II).Results. According to echocardiography, the mean LAVI was 45.48 ± 9.3 ml/m2 and 28.59 ± 4.13 ml/m2 in groups I and II, respectively (p = 0.012). The mean value of left ventricular ejection fraction (LVEF) according to Teicholz in group I was 61.62 ± 7.041%, in group II 63.57 ± 6.16% (p = 0.8). Spearman's сorrelation analysis showed the relationship between LAVI and LVEF before surgery and in the long-term follow-up period, that is agreed with world literature data about contribution left atrial (LA) to left ventricular (LV) function. According to our study, only LAVI < 34 ml/m2 is a risk factor for arrhythmia after TSA. Effectiveness TSA in I group was 77.8%, that is lower than the II group – 88.9%. 3 months after TSA, 20 (17%) patients were required catheter ablations (CA), mainly in I group.Conclusions. Research results showed that an increase in LAVI significantly reduces the effectiveness of TSA in the long-term period by 11.1% compared with LAVI < 34 ml/m2. That are conform with other data of previously submitted works.

The paper considers the joint connection rigidness in a modular building. The joint connection of columns and crossbars with a cross section in the form of square pipes are investigated. The study was carried out by the component finite element method using the IDEA StatiCA software package, the classification of joint connections was adopted according to Eurocode 3. The authors consider two types of joint connections, namely, the ones with an angle stiffener and the ones without an angle stiffener. In the course of research, there were obtained the values of the rotational rigidity of joint connections for various parameters. The boundary characteristics at which joint connections should be considered rigid have been established.

Primary tumors of the heart are a rare pathology with a frequency of occurrence of 0.0017% to 0.28% according to autopsies, while 75% of them are benign in nature, 25% are malignant. Secondary tumors of the heart occur 20–40 times more often than primary tumors. Due to the rapid development of radiology diagnostic methods, the chances of early detection of heart tumors have improved significantly at present. Recently, large cardiology centers have accumulated a lot of experience in the diagnosis and treatment of these lesions. However, early detection in primary malignant lesions of the heart is still a problem, since the clinical symptoms appear when tumors reach a large size. Modern methods of treatment of the heart malignant tumors include radical surgery, and in case of impossibility – cytoreductive surgery.We present literature review on the diagnostic methods and differential diagnosis of the heart lesions. The types of cardiac tumors are described; its morphological features, differential diagnostic imaging features and hemodynamic characteristics of the lesions are presented; the diagnostic effectiveness of modern imaging methods is analyzed.

The mechanism of the interaction of soil and an underground pipeline is studied in order to determine the load arising on the pipeline from the pressure due to the backfill soil and automobile traffic. A more accurate calculation is made of the coefficient accounting for the relief of the pipeline by the soil located in the recesses between the trench walls and the pipeline, and the deformation modulus of the backfill soil is evaluated. It is shown that the distribution of the compressive stresses arising in the soil as a result of the surface traffic is similar to that of a uniformly distributed load.

Situs viscerus inversus totalis – a complete reverse arrangement of the internal organs – is a rarely occurring congenital anomaly of development. Situs inversus with dextrocardia is more common. Congenital heart disease is observed with situs inversus with dextrocardia in 3–5% of cases, usually with transposition of large vessels. Сlinical сase of the patient P., 28 years old, with infective endocarditis of the aortic valve and atrial septal defect and situs viscerus inversus totalis also are presented. This case demonstrates the high importance of radiation methods in the diagnosis of complete transposition of organs as a congenital anomaly of development, as well as concomitant pathological conditions at the stages of surgical correction of these conditions.

The paper presents an analytical method of modular buildings calculation. It focuses upon basic design assumptions that are accepted for modular buildings calculation. The authors introduce their classification of loads and impacts, which are basic for modular buildings. They also describe a method of determining inertial forces from seismic action designed on the basis of a cantilever analytical model. Analytical and numerical methods for determining the forces in the elements of modular units are further compared. It is revealed that the analytical method strongly agrees with FEM (that is the finite elements method) with the error being 2-6%. The analytical method is sufficiently accurate for engineering calculations.

The comparative energy content of open-hearth steel with a scrap-process and electric steel in the modernization stage of electric steel smelting production is considered. The structure of steel energy content is revealed in the form of technological fuel number (TFN) and the main limiting factors of energy content are determined. Amarked reduction is demonstrated for the energy content of electric steel compared with open-hearth steel. The specific nature of the carburization process for scrap is demonstrated. Typical energy content indices are revealed. The main reserves of energy resource conservation are determined.

Perivascular epithelioid cell tumors is a group of rare tumors composed of histologically and immunohistochemically distinctive perivascular epithelioid cells. There are no specific imaging sighs. In most cases, the final diagnosis is possible only after the immunihistochemical study. These tumors are extremely rare. We present imaging findings of two cases of perivascular epithelioid cell tumors of the liver.

The experience of single institution of 43 robotic-assisted operations in the abdomen and retroperitoneal space has been analyzed. The problem of port placement conditioned the preoperative computed 3D-modelling of the operative course. The procedure allowed to optimize the movements of the robotic manipulators, decrease the risk of organ injury and overall incidence of intra- an postoperative complications.

The paper presents the data on phonoenterograms of 96 healthy children. Registration of the type of intestinal acoustic activity and its round-the-clock variations is found to be mandatory.

Some ways to improve informative capacity of ultrasonic diagnostic examinations are discussed, and their application in an extended network of outpatient clinics by using the state-of-the-art automated devices, microcomputers and microprocessors in particular, are considered. Possible approaches to automating ultrasonic diagnostic examinations are analysed, and requirements for hardware and software of ultrasonic complexes are specified. A configuration structure of complexes for processing monodimensional and bidimensional echo signals is presented.

A method of electrical simulation is proposed for determining the boundary conditions with respect to heat transfer when the temperatures in the body are known.

A device for collecting medical history data, using the microprocessor K580 and intended for work in the automated system for mass prophylactic surveys, is discussed. The device is realized in 2 variants: working autonomously or in combination with computers of a higher level. The structural diagrams of both variants and the software for the autonomous variant are described.

The paper presents the data on phonoenterograms of 96 healthy children. Registration of the type of intestinal acoustic activity and its round-the-clock variations is found to be mandatory.

An optimal modification of the patients flow arrangement is offered for more convenient form and methods of the population screening for malignant tumours and precancerous diseases, aided by medical and computer techniques. A scheme of the mass-screening system and principal aspects of technical provision particularly for oncological screening are presented.

Some ways to improve informative capacity of ultrasonic diagnostic examinations are discussed, and their application in an extended network of outpatient clinics by using the state-of-the-art automated devices, microcomputers and microprocessors in particular, are considered. Possible approaches to automating ultrasonic diagnostic examinations are analysed, and requirements for hardware and software of ultrasonic complexes are specified. A configuration structure of complexes for processing monodimensional and bidimensional echo signals is presented.

The problem of recording brain stem evoked potentials of a short latency in the submicrovolt range is discussed. A flow-chart of the system is selected, and a circuit diagram of a stimulator to produce pain and auditory impulses that excite the evoked brain stem potentials is presented.

Some problems of developing an automated control subsystem "Oncologic examinations" to perform health screening in outpatient conditions with the aim of early neoplasm detection are discussed.