technical errors
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2022 ◽  
Vol 19 (3) ◽  
pp. 2381-2402
Author(s):  
Danial Sharifrazi ◽  
◽  
Roohallah Alizadehsani ◽  
Javad Hassannataj Joloudari ◽  
Shahab S. Band ◽  
...  

<abstract> <p>Myocarditis is the form of an inflammation of the middle layer of the heart wall which is caused by a viral infection and can affect the heart muscle and its electrical system. It has remained one of the most challenging diagnoses in cardiology. Myocardial is the prime cause of unexpected death in approximately 20% of adults less than 40 years of age. Cardiac MRI (CMR) has been considered a noninvasive and golden standard diagnostic tool for suspected myocarditis and plays an indispensable role in diagnosing various cardiac diseases. However, the performance of CMR depends heavily on the clinical presentation and features such as chest pain, arrhythmia, and heart failure. Besides, other imaging factors like artifacts, technical errors, pulse sequence, acquisition parameters, contrast agent dose, and more importantly qualitatively visual interpretation can affect the result of the diagnosis. This paper introduces a new deep learning-based model called Convolutional Neural Network-Clustering (CNN-KCL) to diagnose Myocarditis. In this study, we used 47 subjects with a total number of 98,898 images to diagnose myocarditis disease. Our results demonstrate that the proposed method achieves an accuracy of 97.41% based on 10 fold-cross validation technique with 4 clusters for diagnosis of Myocarditis. To the best of our knowledge, this research is the first to use deep learning algorithms for the diagnosis of myocarditis.</p> </abstract>


2022 ◽  
Vol 13 (1) ◽  
pp. 99-104
Author(s):  
Radhika Krishna O H ◽  
Srinivas Srirampur ◽  
Vani Padmaja G J ◽  
Ramesh Reddy Kota

Background: Hirschsprung’s disease is the most important cause of functional intestinal obstruction in children. It is characterized by the absence of ganglion cells in the submucosal and myenteric plexuses on histology. In 10% of Hirschsprungs disease patients, involvement of the entire colon is seen in a condition called total colonic aganglionosis (TCA). The absence of ganglion cells in the appendix on histology has been considered diagnostic of TCA. The validity of this histological finding being taken as criteria for diagnosis is not clear. Aims and Objectives: This study examines the presence and the number of myenteric and submucosal ganglion cells in the appendices of suspected cases of TCA and compares these findings with controls, specimens of acute appendicitis, and histologically normal appendix in pediatric cases. Materials and Methods: Thirty-six appendix specimens of suspected TCA cases and controls, that is, ten each of acute appendicitis and histologically normal appendix in pediatric age group were included in this study taken up in the pathology department of a tertiary pediatric referral hospital. The presence or absence and the number of ganglion cells in each specimen was semiquantitatively evaluated in a blinded manner. These findings were descriptively compared and analyzed. The difficulties faced by the pathologist in reporting the pediatric appendix specimens were also documented. Results: The cases and controls showed that aganglionosis and no significant difference were noted in the number of ganglion cells per high power field between the cases and controls. The reporting pathologists enumerated quite a few pitfalls and problems encountered by them in the process of interpreting ganglion cell status of pediatric, particularly neonatal appendicectomy specimens. Conclusion: Aganglionosis of the appendix on histology may not be an ideal tool for the diagnosis of TCA. Difficulties in histological characterization of ganglion cells, technical errors in tissue embedding and the presence aganglionic skip areas might cause errors in the interpretation of ganglion cell status of appendix specimens, particularly infants, and neonates.


Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 42
Author(s):  
Joanna Rzempała ◽  
Daniel Borkowski ◽  
Artur Piotr Rzempała

The purpose of the article is to define the risk factors in cogeneration projects and to demonstrate that a lack of sufficient identification of risks in different phases affects project implementation. A theoretical study is conducted, which aims to identify risk factors in cogeneration projects, based on case studies of such projects in Poland. The study offers a view at CHP (combined heat and power) projects as extremely dependent on the external environment of the organisation. These projects are subject to many external regulations due to their environmental impact and dynamically changing technical aspects. The biggest technical errors occur at the planning and construction stages. The biggest economic and financial risks occur at the execution stage after 2% and 3% of additional design costs occur, respectively. The authors estimated the risks at different stages of the project and concluded that the total cost of failure in correct identification of the risks at the planning stage exceeded PLN 1.5 billion, which amounted to almost 60% of the total additional costs of materialised project risk. Consequently, the biggest challenges in the area of CHP project management at the planning stage are a thorough identification of risks, and the pricing and planning reactions to risk.


2021 ◽  
Author(s):  
Shengjie Dong ◽  
Chenshu Shi ◽  
Zhiying Jia ◽  
Minye Dong ◽  
Yuyin Xiao ◽  
...  

BACKGROUND Studies have shown that hospitals or physicians with multiple malpractice claims are more likely to be involved in new claims; this finding indicates that medical malpractice may be clustered by institutions. OBJECTIVE We aimed to identify common factors that contribute to developing interventions to reduce future claims and patient harm. METHODS This study implemented a null hypothesis whereby malpractice claims are random events—attributable to bad luck with random frequency. As medical malpractice is a complex issue, thus, this study applied the complex network theory, which provided the methodological support for understanding interactive behavior in medical malpractice. Specifically, this study extracted the semantic network in 6610 medical litigation records (unstructured data) obtained from a public judicial database in China; they represented the most serious cases of malpractice in the country. The medical malpractice network of China (MMNC) was presented as a knowledge graph; it employs the International Classification of Patient Safety from the World Health Organization as a reference. RESULTS We found that the MMNC was a scale-free network: the occurrence of medical malpractice in litigation cases was not random, but traceable. The results of the hub nodes revealed that orthopedics, obstetrics and gynecology, and emergency department were the three most frequent specialties that incurred malpractice; inadequate informed consent work constituted the most errors. Non-technical errors (e.g. inadequate informed consent) showed a higher centrality than technical errors. CONCLUSIONS Hospitals and medical boards could apply our approach to detect hub nodes that are likely to benefit from interventions; doing so could effectively control medical risks. CLINICALTRIAL Not applicable


Author(s):  
A.A. Shevchenko ◽  
◽  
N.G. Zhila ◽  
E.A. Kashkarov ◽  
K.S. Shevchenko ◽  
...  

Median sternotomy remains the most common access in cardiac surgery, while postoperative sternomediastinitis is one of the most severe complications of the transsternal approach. The article analyzes the preoperative risk factors for the development of this complication, including concomitant pathology, constitutional features, bad habits, length of hospital stay, and the urgency of the operation. It was also noted that intraoperative risk factors consist of technical errors in the performance of the operation, intraoperative features of the course of surgery, the nature of the choice of the shunt during myocardial vascularization and the final stage of the operation. Postoperative risk factors include the specific management of the postoperative period in cardiac surgery patients, which can lead to the development of sternomediastinitis. The analysis of measures taken by cardiac surgeons to prevent the development of this complication was carried out


2021 ◽  
Vol 13 (2) ◽  
pp. 790-795
Author(s):  
Tran Van Hai ◽  
Pham Huy Hung ◽  
Vu Thuy Ha

The goal of creating, forming, and developing businesses in general and securities companies in particular, whose ultimate goal is profit, high and stable profitability is the goal of any company. However, due to their specific business lines, securities companies are affected by risks such as market risk (which is the value corresponding to the level of loss that may occur when the market price of assets currently owned and expected to be owned under the underwriting commitment fluctuates in an adverse direction); Payment risk (is the value corresponding to the level of loss that may occur when the counterparty is unable to make payment on time or deliver assets on time as committed; operational risk (is the value corresponding to the level of losses that may occur due to technical errors, system and business process errors, human errors in the operation process, due to lack of business capital arising from expenses and losses from investment activities, due to other objective reasons). The problem is how the securities company can balance the safety goal, limit the possible risks and at the same time still increase the ability of the enterprise profitability. In practice, there are many methods to measure risk, but one of the most widely accepted methods of predicting risk and bankruptcy today is Z-score of the US economist's - Edward I. Altman – a lecturer of New York University faculty member set. In the US, about 95% of bankruptcies are forecast from the Z-score one year before the closing date, but this rate drops to just 74% for 2-year forecasts. From the initial Z-index forecast, Professor Edward I. Altman has developed it into Z' and Z'' to be applicable to each type and industry of the business. The Z'' coefficient is similar to the S&P credit rating.


2021 ◽  
pp. 32-37
Author(s):  
V. V. Arkhipov

The effectiveness of inhalation therapy can be significantly reduced by a number of problems. For example, inhalation technique errors can reduce the dose delivered by 22-95% compared to the optimal value in patients with technical errors in the use of the inhaler. Sub-optimal inspiratory flow rates in a number of patients with chronic obstructive pulmonary disease and asthma are often the cause of technical errors during inhalation. Patient education does not produce the expected results, as the underlying cause of reduced flow is high hyperinflation and weakening of the respiratory musculature. The use of technologically outdated inhalers is another significant cause of reduced therapy effectiveness. Patient education and even conversion to a different inhaler do not always increase the effectiveness of therapy. Respimat, a brand new delivery agent introduced in 2004, allows 39% to 67% of the nominal dose to be delivered to the airways, while the degree of pulmonary deposit is independent of inspiratory flow and pulmonary drug deposit does not decrease with increasing obstruction. Compared to powder inhalers, Respimat creates less resistance to airflow on inhalation. In addition, Respimat is an active device that requires no effort on the part of the patient to move the aerosol particles. These features make Respimat the new standard for inhalation therapy. This review aims to familiarise readers with the main features of the Respimat and the latest research findings


Plants ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 2291
Author(s):  
Jae Gyeong Jung ◽  
Ki Eun Song ◽  
Sun Hee Hong ◽  
Sang In Shim

Since the application of hyperspectral technology to agriculture, many scientists have been conducting studies to apply the technology in crop diagnosis. However, due to the properties of optical devices, the reflectances obtained according to the image acquisition conditions are different. Nevertheless, there is no optimized method for minimizing such technical errors in applying hyperspectral imaging. Therefore, this study was conducted to find the appropriate image acquisition conditions that reflect the growth status of wheat grown under different nitrogen fertilization regimes. The experiment plots were comprised of six plots with various N application levels of 145.6 kg N ha−1 (N1), 109.2 kg N ha−1 (N2), 91.0 kg N ha−1 (N3), 72.8 kg N ha−1 (N4), 54.6 kg N ha−1 (N5), and 36.4 kg N ha−1 (N6). Hyperspectral image acquisitions were performed at different shooting angles of 105° and 125° from the surface, and spike, flag leaf, and the second uppermost leaf were divided into five parts from apex to base when analyzing the images. The growth analysis conducted at heading showed that the N6 was 85.6% in the plant height, 44.1% in LAI, and 64.9% in SPAD as compared to N1. The nitrogen content in the leaf decreased by 55.2% compared to N1 and the quantity was 44.9% in N6 compared to N1. Based on the vegetation indices obtained from hyperspectral reflectances at the heading stage, the spike was not suitable for analysis. In the case of the flag leaf and the 2nd uppermost leaf, the vegetation indices from spectral data taken at 105 degrees were more appropriate for acquiring imaging data by clearly dividing the effects of fertilization level. The results of the regional variation in a leaf showed that the region of interest (ROI), which is close to the apex of the flag leaf and the base of the second uppermost leaf, has a high coefficient of determination between the fertilization levels and the vegetation indices, which effectively reflected the status of wheat.


2021 ◽  
pp. 153857442110522
Author(s):  
Rodolfo Pini ◽  
Gianluca Faggioli ◽  
Sergio Palermo ◽  
Sara Fronterrè ◽  
Moad Alaidroos ◽  
...  

Background: The outcomes of carotid endarterectomy (CEA) are constantly reported in a multitude of studies; however, the specific causes of perioperative stroke have been scarcely investigated. The aim of the present study was to analyze and categorize the causes of perioperative strokes after CEA. Methods: All CEAs performed from 2006 to 2019 in a single center were collected. CEA was routinely performed under general anesthesia, with routine shunting and patching, using cerebral near-infrared spectroscopy monitoring. Carotid exposure technique was classified as either clamped-dissection (CD) or preclamping-dissection (PCD) if the carotid bifurcation was dissected after or prior to carotid clamping. Perioperative and 30-day strokes and their possible mechanisms were evaluated according to preoperative symptoms and surgical technique adopted. Results: Among 1760 CEAs performed, 30 (1.7%) perioperative strokes occurred. 14 (47%) were identified upon emergence from general anesthesia, and 16 (53%) were noted in the first 30 days following intervention. Stroke etiology was categorized as follows: technical (acute thrombosis or intimal flap or due to intraoperative complications), embolic (no recognized technical defect), hemorrhagic, or contralateral. Symptomatic patients had a significantly higher rate of any type of stroke than asymptomatic patients (3.8% vs 0.9%, P = .0001). CD was protective for postoperative stroke (0.9% vs 3.1%, P = .001) in both symptomatic and asymptomatic patients (2.5% vs 5.9%, P = .05; 0.4% vs 1.9%, P = .005), particularly for the cohort in which symptomatic patients (0.7% vs 3.2%, P = .04) suffered postoperative embolic stroke. Conclusion: Perioperative stroke in CEA may be multifactorial in etiology, including a result of technical errors. A CD technique may help reduce the incidence of perioperative stroke.


2021 ◽  
Vol 1 (4) ◽  
pp. 86-90
Author(s):  
Satria Putra Wicaksana

Femoral fractures are a challenging medical and social problem as they may occur at any age. All the available osteosynthesis types can be used to treat such injuries. However, despite the disadvantages, fixation with plates has been the most common and developed. The PubMed and EMBASE databases were used to perform a systematic review of the English literature to assess the functional results and complications associated with proximal humerus locking plates. All institutional, author, and journal information was concealed to minimize reviewer bias. Fixation of proximal humerus fractures with proximal humerus locking plates is associated with a high rate of complications and reoperation. Further study is needed to determine what technical errors and patient characteristics are risk factors for failure of this now common fixation technique.


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