scholarly journals Biomechanical modeling and problematic issues of surgical correction of congenital funnel chest deformity

2021 ◽  
pp. 58-62
Author(s):  
V.A. Dihtiar ◽  
◽  
M.O. Kaminska ◽  
Keyword(s):  
Road Traffic ◽  
Conflicts Of Interest ◽  
Objective Assessment ◽  
Spinal Column ◽  
Surgical Correction ◽  
Funnel Chest ◽  
Operation Analysis ◽  
Chest Deformity ◽  
Chest Deformities ◽  
The One

Congenital funnel chest deformity (CFCD) is noted in 0.6–2.3% of the population and accounts for 90% of all congenital chest deformities. Nuss thoracoplasty is the most common method for treating CFCD, which is considered a minimally invasive technology and provides a quick cosmetic effect. Purpose is to search for models of CFCD and its surgical correction in order to create a technique that is as close to reality as possible, which will make it possible to optimally plan and rationally carry out the forthcoming operation. Analysis of literature sources showed that, on the one hand, the construction of simplified models of the chest allows quick research, but these simplifications do not allow for an objective assessment of the influence and interaction of various elements of the complex biomechanical system «sternum–rib–spine». On the other hand, complex models are more reliable, but hardly available for implementation due to their ultra-high manufacturability and cost. In addition, in studies of stress-strain state on models of the chest, the presence of the spinal column or the interaction of the ribs with the vertebrae has been insufficiently studied. When in the works on modeling road traffic injuries this is justified due to the support of the spine on the seat, then when modeling the correction of chest deformities, the lack of consideration of the mobility of the articular joints and the flexibility of the spinal column can lead to incorrect and false results. It is promising to create a technique for modeling CFCD and its surgical correction in conditions close to reality. This will make it possible to develop a rational modification of thoracoplasty based on the D. Nuss operation under the condition of one–stage full–fledged stable correction and minimal biomechanical loads in the «sternum-rib-spine» system. No conflicts of interest was declared by the authors. Key words: funnel chest deformity, thoracoplasty, biomechanics.

The use of double catheter epidural anesthesia in the lumbar segment of the spine during surgical correction of funnel chest deformity

2012 ◽  
Vol 93 (4) ◽  
pp. 654-656
Author(s):  
R R Safin ◽  
O G Anisimov
Keyword(s):  
General Anesthesia ◽  
Epidural Anesthesia ◽  
Comparison Group ◽  
Main Group ◽  
Surgical Correction ◽  
Thoracic Epidural Anesthesia ◽  
Congenital Deformity ◽  
Funnel Chest ◽  
Thoracic Epidural ◽  
Chest Deformity

Aim. To provide clinically effective epidural anesthesia during corrective thoracoplasty in children with congenital deformity of the chest with the use of an access, which makes it possible to minimize the probability of accidental spinal cord injury during the procedure. Methods. Conducted was a prospective study of 40 adolescents randomized to the main group (thoracic epidural anesthesia combined with general anesthesia) and the comparison group (general anesthesia), 20 observations in each group. In order to evaluate the effectiveness of the method at the time of surgery determined was the level of cortisol and glucose, and after the operation recorded were the times of resolution of the pneumothorax and of the intensity of pain. Results. In the main group a slight decrease in the biochemical markers of stress was noted in contrast to their moderate increase by the end of the operation in the comparison group. Associated complications and pain in the postoperative period in the main group were expressed to a lesser extent than in the comparison group. Conclusion. Thoracic epidural anesthesia combined with general anesthesia may be the method of choice during surgical correction of the funnel chest deformity.

scholarly journals Surgical correction of the funnel chest deformity in children

2010 ◽  
Vol 35 (7) ◽  
pp. 1043-1048 ◽  
Author(s):  
Mirko Žganjer ◽  
Vlasta Žganjer
Keyword(s):  
Surgical Correction ◽  
Funnel Chest ◽  
Chest Deformity

scholarly journals Right Ventricular Compression Mimicking Brugada-Like Electrocardiogram in a Patient with Recurrent Pectus Excavatum

2017 ◽  
Vol 2017 ◽  
pp. 1-4
Author(s):  
Jinhee Ahn ◽  
Jong-Il Choi ◽  
Jaemin Shim ◽  
Sung Ho Lee ◽  
Young-Hoon Kim
Keyword(s):  
Pectus Excavatum ◽  
Surgical Correction ◽  
Mechanical Compression ◽  
St Segment Elevation ◽  
Skeletal Anomaly ◽  
St Segment ◽  
Chest Deformity ◽  
The Right ◽  
Electrocardiogram Ecg ◽  
Benign Course

Pectus excavatum (PE), the most common skeletal anomaly of chest wall, sometimes requires a surgical correction but recurrent PE is not uncommon. PE usually has a benign course; however, this chest deformity may be associated with symptomatic tachyarrhythmias due to mechanical compression. We report a case of a patient with recurrent PE after surgical correction presenting with palpitation and electrocardiogram (ECG) showing ST-segment elevation on the right precordial leads, which could be mistaken for a Brugada syndrome (BrS).

Machine Learning and statistic predictive modeling for road traffic flow

2021 ◽  
Vol 03 (01) ◽  
pp. 17-24
Author(s):  
Nadia Slimani ◽  
Ilham Slimani ◽  
Nawal Sbiti ◽  
Mustapha Amghar
Keyword(s):  
Road Traffic ◽  
Smart Cities ◽  
Moving Average ◽  
Ann Model ◽  
Important Place ◽  
Traffic Forecasting ◽  
Absolute Relative Error ◽  
History Of ◽  
The One ◽  
Motorized Vehicles

Traffic forecasting is a research topic debated by several researchers affiliated to a range of disciplines. It is becoming increasingly important given the growth of motorized vehicles on the one hand, and the scarcity of lands for new transportation infrastructure on the other. Indeed, in the context of smart cities and with the uninterrupted increase of the number of vehicles, road congestion is taking up an important place in research. In this context, the ability to provide highly accurate traffic forecasts is of fundamental importance to manage traffic, especially in the context of smart cities. This work is in line with this perspective and aims to solve this problem. The proposed methodology plans to forecast day-by-day traffic stream using three different models: the Multilayer Perceptron of Artificial Neural Networks (ANN), the Seasonal Autoregressive Integrated Moving Average (SARIMA) and the Support Machine Regression (SMOreg). Using those three models, the forecast is realized based on a history of real traffic data recorded on a road section over 42 months. Besides, a recognized traffic manager in Morocco provides this dataset; the performance is then tested based on predefined criteria. From the experiment results, it is clear that the proposed ANN model achieves highest prediction accuracy with the lowest absolute relative error of 0.57%.

scholarly journals Problematyka konfliktu interesów w funkcjonowaniu rynku kapitałowego

Ekonomia ◽  
2018 ◽  
Vol 24 (2) ◽  
pp. 73-91
Author(s):  
Agnieszka Parkitna ◽  
Arkadiusz Górski
Keyword(s):  
Capital Market ◽  
Conflict Of Interest ◽  
Conflicts Of Interest ◽  
Good Practice ◽  
Causal Link ◽  
Secondary Market ◽  
Market Practices ◽  
Business Entities ◽  
The One ◽  
The Capital Market

Problems of conflicts of interest in the functioning of the capital marketThe study refers to the occurrence of conflicts of interest on the capital market, which negatively affects the functioning of the capital market, limits its development potential, and may even affect the outflow of investors, particularly those providing liquidity in the market. Today, the social responsibility of business entities becomes something important. It is a specific determinant of the company’s image and the basis of its operation. Word = Institution “brokerage house” should be associated with competence, honesty, or righteousness resulting from observance of the law and ethics principles of conducted business. The existence of a set of regulations the Code of Good Practice for Brokerage Houses, the Act on Counteracting Unfair Market Practices relating to the functioning of brokerage houses, there are situations in business practice that are not used to develop a capital market, based on a conflict of interest. Brokerage firms are obliged, on the one hand, to: sell shares and, on the other hand, recommend buying them. “Manipulation on the market” would mean entering into transactions that give false, misleading signals about supply, demand, and prices of equity instruments. To avoid conflicts of interest, there are special procedures in brokerage offices that prevent co-operation between competing departments: chinese walls.Each office additionally has rules governing the flow and control of confidential information. Such information may not be available, for example, between primary and secondary market forces, between sales departments and analysis departments.The indicated issues were brought together, focusing on the possible consequences of conflicts of interest. It emphasizes the difficulty of bringing justice through the necessity of showing the causal link between the conflict of interest and the possible loss of the investor. Then solutions were identified to protect against the negative aspects of the conflict of interest, and the proposals were presented in their conclusions.

scholarly journals Passenger Car Energy Demand Assessment: a New Approach Based on Road Traffic Data

2020 ◽  
Vol 197 ◽  
pp. 05006
Author(s):  
Umberto Previti ◽  
Sebastian Brusca ◽  
Antonio Galvagno
Keyword(s):  
Energy Management ◽  
Energy Demand ◽  
Electric Propulsion ◽  
Road Traffic ◽  
Driving Cycle ◽  
City Centre ◽  
Automotive Market ◽  
Driving Cycles ◽  
Traffic Level ◽  
The One

Nowadays the automotive market is oriented to the production of hybrid or electric propulsion vehicle equipped with Energy Management System that aims to minimize the consumption of fossil fuel. The EMS, generally, performs a local and not global optimization of energy management due to the impossibility of predicting the user’s energy demand and driving conditions. The aim of this research is to define a driving cycle (speed time) knowing only the starting and the arrival point defined by the driver, considering satellite data and previous experiences. To achieve this goal, the data relating to the energy expenditure of a car (e.g. speed, acceleration, road inclination) will be acquired, using on-board acquisition system, during road sections in the city of Messina. At the same time, the traffic level counterplot and others information provided, for these specific sections, from GPS acquisition software will be collected. On-board and GPS data will be compared and, after considering an adequate number of acquisitions, each value of the traffic level will be associated with a driving cycle obtained by processing the acquired data. After that, the numerical model of a car will be created which will be used to compare the energy demand of two driving cycles. The first one acquired on a section with a random starting and destination point inside the historic city centre of Messina. The second is the one assigned, for that same section, considering only the value of the traffic level counterplot.

Dimensionality and Construct Validity of a Video-Based, Objective Personality Test for the Assessment of Willingness to Take Risks in Road Traffic

2005 ◽  
Vol 97 (1) ◽  
pp. 309-320 ◽  
Author(s):  
Martin E. Arendasy ◽  
Andreas Hergovich ◽  
Markus Sommer ◽  
Bettina Bognar
Keyword(s):  
Construct Validity ◽  
Personality Trait ◽  
Road Traffic ◽  
Personality Test ◽  
Traffic Situation ◽  
One Dimensional ◽  
First Results ◽  
The One ◽  
The Given ◽  
Homeostasis Theory

The study at hand reports first results about the dimensionality and construct validity of a newly developed objective, video-based personality test, which assesses the willingness to take risks in traffic situations. On the basis of the theory of risk homeostasis developed by Wilde, different traffic situations with varying amounts of objective danger were filmed. These situations mainly consisted of situations with passing maneuvers and speed choice or traffic situations at intersections. Each of these traffic situations describes an action which should be carried out. The videos of the traffic situations are presented twice. Before the first presentation, a short written explanation of the preceding traffic situation and a situation-contingent reaction is provided. The respondents are allowed to obtain an overview of the given situations during the first presentation of each traffic situation. During the second presentation the respondents are asked to indicate at which point the action that is contingent on the described situation will become too dangerous to carry out. Latencies for items were recorded as a measure for the magnitude of the person's subjectively accepted willingness to take risks in the sense of the risk homeostasis theory by Wilde. In a study with 243 people with different education and sex, the one-dimensionality of the test corresponding to the latency model by Scheiblechner was investigated. Analysis indicated that the new measure assesses a one-dimensional latent personality trait which can be interpreted as subjectively accepted amount of risk (target risk value). First indicators for the construct validity of the test are given by a significant correlation with the construct-related secondary scale, adventurousness of the Eysenck Personality Profiler with, at the same time, nonsignificant correlations to the two secondary scales, extroversion and emotional stability, that are not linked to the construct.

CORRECTION OF FUNNEL CHEST DEFORMITY*

1953 ◽  
Vol 46 (7) ◽  
pp. 636-638 ◽  
Author(s):  
JOHN G. CHESSNEY ◽  
DEWITT C. DAUGHTRY
Keyword(s):  
Funnel Chest ◽  
Chest Deformity

scholarly journals Assessment of direct and indirect effects of building developments on the environment

2019 ◽  
Vol 9 (1) ◽  
pp. 109-114
Author(s):  
Elżbieta Hanna Szafranko
Keyword(s):  
Complex Analysis ◽  
Objective Assessment ◽  
Optimal Solution ◽  
Point Of View ◽  
Nature Protection ◽  
Building Projects ◽  
Indicator Method ◽  
Considerable Impact ◽  
The One

AbstractAny building construction undertaking is inseparable from the environment in which it will be executed. Among all buildings, the most difficult ones from the point of view of nature protection are those which have been classified as having a considerable impact on the environment. Roads and road infrastructure are a particular case. Construction of roads or railroads and their subsequent long-term use lead to many changes in the environment. When planning such building projects, it is recommended to develop variant solutions in order to choose the one that would be least harmful to the environment, and then to submit them to an objective assessment. To facilitate the selection of an optimal solution, assessment indicators are developed. However, it needs to be remembered that a factor perceived as a negative one in the immediate assessment might generate positive consequences on a broader scale and vice versa. Hence, an assessment of the impacts on the environment caused by building projects should be viewed in the context of indirect (global) and direct (local) effects. This article will present a model analysis of the impacts caused by a fragment of a road, including local and global effects measured by the indicator method. This method has been developed by the author of this article, who believes that it enables the user to make a complex analysis, while the graphic presentation it involves, discussed in the conclusions to this paper, helps to decide easily which factors are decisive in the final assessment of the analysed project.

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