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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
51

Assessment of Intra- and Inter-individual Variability of Outcome Measures in Ankylosing Spondylitis and the Efficacy and Adverse Effects of Anti-TNF Therapy

Maxwell, Lara J 05 July 2011 (has links)
Ankylosing spondylitis (AS) is a chronic, inflammatory rheumatic disease that has a highly variable disease course. Three biologic agents, adalimumab, etanercept, and infliximab, have been developed for the treatment of AS. We conducted three studies: 1) an exploratory analysis of a year-long longitudinal dataset to gain insight into the variability of disease activity, physical function, and well-being and to explore the relationship between these outcome measures; 2) a systematic review of the available evidence for the efficacy of biologic treatment; 3) a systematic review of potential adverse effects of this treatment. We found that repeated measures of disease activity, function and well-being fluctuate considerably between patients, with complex patterns occurring over time within patients. There was mostly high quality evidence that these biologics are efficacious against placebo. We did not find evidence of an increase in serious adverse events or serious infections from short-term randomized controlled trials.
52

Protocol for a Systematic Literature Review on Security-related Research in Ubiquitous Computing

Kusen, Ema, Strembeck, Mark 18 December 2014 (has links) (PDF)
Context: This protocol is as a supplementary document to our review paper that investigates security-related challenges and solutions that have occurred during the past decade (from January 2003 to December 2013). Objectives: The objective of this systematic review is to identify security-related challenges, security goals and defenses in ubiquitous computing by answering to three main research questions. First, demographic data and trends will be given by analyzing where, when and by whom the research has been carried out. Second, we will identify security goals that occur in ubiquitous computing, along with attacks, vulnerabilities and threats that have motivated the research. Finally, we will examine the differences in addressing security in ubiquitous computing with those in traditional distributed systems. Method: In order to provide an overview of security-related challenges, goals and solutions proposed in the literature, we will use a systematic literature review (SLR). This protocol describes the steps which are to be taken in order to identify papers relevant to the objective of our review. The first phase of the method includes planning, in which we define the scope of our review by identifying the main research questions, search procedure, as well as inclusion and exclusion criteria. Data extracted from the relevant papers are to be used in the second phase of the method, data synthesis, to answer our research questions. The review will end by reporting on the results. Results and conclusions: The expected results of the review should provide an overview of attacks, vulnerabilities and threats that occur in ubiquitous computing and that have motivated the research in the last decade. Moreover, the review will indicate which security goals are gaining on their significance in the era of ubiquitous computing and provide a categorization of the security-related countermeasures, mechanisms and techniques found in the literature. (authors' abstract)
53

Systematic Review and Meta‐Analysis of Clinical Outcomes of Fractures Fixed with the Surgical Implant Generation Network (SIGN) Intramedullary Nail

Sonenthal, Nechama 18 May 2017 (has links)
A Thesis submitted to The University of Arizona College of Medicine - Phoenix in partial fulfillment of the requirements for the Degree of Doctor of Medicine. / The (Surgical Implant Generation Network) SIGN Intramedullary (IM) nail is designed to fix long bone fractures without using a costly C‐arm imaging device. It is distributed for free to countries in need, allowing for elevation of care from the standard, lengthy traction treatment in those countries to clinically superior IM nailing. This paper compares the clinical outcomes of the SIGN IM nail to those of the IM nails used in developed countries with use of a C‐arm. The terms “Surgical Implant Generation Network” and “union” were searched in four databases. Primary studies of SIGN IM nails were included and their outcomes, including union rate, time to union, and complications, were recorded and compared to historical data of IM nails used in developed countries. Overall, there is a similar union rate in bones fixed with SIGN IM nails (94.6%) versus bones fixed with IM nails in developed countries (92.3%) (p = 0.009, OR = 1.67), while some bone types (tibia and femur) demonstrated a lower union rate when individually stratified (p = 0.008, OR = 0.26 and p = 0.002 and OR = 0.15, respectively). Mean time to union for all bone types combined showed no significant difference between SIGN IM nails and IM nails used in developed countries (p = 0.26). Complications rates were similar between SIGN IM nails and IM nails used in developed countries. It is possible for the SIGN IM nail to be used to fix long bone fractures in developing countries with outcomes comparable to the IM nail used in developed countries.
54

Konflikt mellan ledare och anställd : En litteratstudie rörande konflikter mellan personer i olika hierarkiskapositioner inom organisationer

Lantz, Irina January 2016 (has links)
Within research regarding superior-subordinate conflict there is noticeable variation. Scientists have found different answers to the question: what causes superior-subordinate conflicts in the workplace. A literature-study was conducted to examine the different scientific studies in the area and try to find a conclusion to what causes the variation and how it affects how one views the social phenomena that is superior-subordinate conflicts. The results indicate that (1) depending on theoretical standpoint the responsibility for the conflict is shifted. (2) Depending on methodical preference the conflict is more or less likely to be viewed as collectively created. In addition to this a Marxian perspective was added in an analytical discussion. Showing that using this theoretical standpoint conflicts can be portrayed as something positive.
55

Systematic review and meta-analysis of experimental multiple sclerosis studies

Vesterinen, Hanna Mikaela January 2013 (has links)
Background: Multiple sclerosis (MS) is the most common cause of disability in young people and yet there are no interventions available which reliably alter disease progression. This is despite several decades of research using the most common animal model of multiple sclerosis, experimental autoimmune encephalomyelitis (EAE). There is now emerging evidence across the neurosciences to suggest that limited internal validity (measures to reduce bias) and external validity (e.g. using a clinically relevant animal model) may influence the translational success. Aim and objectives: To provide an unbiased summary of the scope of the literature on candidate drugs for MS tested in EAE to identify potential reasons for the failures to translate efficacy to clinical trials. My objectives were, across all of the identified publications, to: (1) describe the reporting of measures to reduce bias and to assess their impact on measures of drug efficacy; (2) assess the relationship between treatment related effects measured using different outcome measures; (3) assess the prevalence and impact of any publication bias; (4) compare findings from the above with another disease with limited translational success (Parkinson’s disease; PD). Methods: I used systematic searches of three online databases to identify relevant publications. Estimates of efficacy were extracted for neurobehavioural scores, inflammation, demyelination and axon loss. For PD experiments, we searched for dopamine agonists tested in animal models of PD with outcome assessed as change in neurobehavioural scores. I calculated normalised mean difference or standardised mean difference effect sizes and combined these in a meta-analysis using a random effects model. I used stratified meta-analysis or meta-regression to assess the extent to which different study design characteristics explained differences in reported efficacies. These characteristics included: measures to reduce bias (random allocation to group and blinded assessment of outcome), the animal species, sex, time of drug administration, route of drug administration and the number of animals per group. Publication bias was assessed using funnel plotting, Egger regression and “trim and fill”. Results: I identified 1464 publications reporting drugs tested in EAE. Reported study quality was poor: 11% reported random allocation to group, 17% reported blinded assessment of neurobehavioural outcomes, 28% reported blinded assessment of histological outcomes, and < 1% reported a sample size calculation. Estimates of efficacy measured as the reduction in inflammation were substantially higher in unblinded studies (47.1% reduction (95% CI 41.8-52.4)) versus blinded studies (33.1% (25.8-40.4). Moreover, the same finding was identified for 121 publications on dopamine agonists tested in experimental PD models where efficacy was measured as change in neurobehavioural outcomes. For EAE studies we were unable to include data from 631 publications describing original research. Usually this was because the publication did not include basic details such as the number of animals in each group (115 publications), the observed variance (592) or suitable control data (49). For each category of outcome I found evidence of a substantial publication bias. Interventions were most commonly administered on or before the induction of EAE with shorter times to treatment associated with higher estimates of efficacy for the reduction in mean severity scores (a neurobehavioural outcome). Treatment related effects were found to vary across different outcome measures with the largest effect being for the reduction in axon loss. Where neurobehavioural scores and axon loss were measured in the same cohort of animals, the concordance between efficacies in these increased with later times to treatment. Conclusions: In this, the largest systematic review and meta-analysis of animal studies in any domain, I have found that a large number of publications present incomplete data. In addition, measures to reduce bias are seldom reported, the lack of which is associated with overstatements of efficacy for both a measure of drug efficacy in EAE and experimental PD studies. Translational success may have also been affected by the majority of studies administering drugs on or before EAE induction which is of limited relevance in the clinical setting where patients do not present at that stage of disease. Moreover, my analysis of the relationship between outcome measures provides empirical evidence from systematically identified studies to suggest that targeting axon loss as later time points is most strongly associated with improvements in neurobehavioural scores. Therefore drugs which are successfully able to target axon loss at these time points may offer substantial hope for clinical success. Overall, improvements in the conduct and reporting of preclinical studies are likely to improve their utility, and the prospects for translational success. While my findings relate predominately to the animal modelling of MS and PD it is likely that they also hold for other animal research.
56

Protocol for a Systematic Literature Review on Security-related Research in Ubiquitous Computing

Kusen, Ema, Strembeck, Mark 18 December 2014 (has links) (PDF)
Context: This protocol is as a supplementary document to our review paper that investigates security-related challenges and solutions that have occurred during the past decade (from January 2003 to December 2013). Objectives: The objective of this systematic review is to identify security-related challenges, security goals and defenses in ubiquitous computing by answering to three main research questions. First, demographic data and trends will be given by analyzing where, when and by whom the research has been carried out. Second, we will identify security goals that occur in ubiquitous computing, along with attacks, vulnerabilities and threats that have motivated the research. Finally, we will examine the differences in addressing security in ubiquitous computing with those in traditional distributed systems. Method: In order to provide an overview of security-related challenges, goals and solutions proposed in the literature, we will use a systematic literature review (SLR). This protocol describes the steps which are to be taken in order to identify papers relevant to the objective of our review. The first phase of the method includes planning, in which we define the scope of our review by identifying the main research questions, search procedure, as well as inclusion and exclusion criteria. Data extracted from the relevant papers are to be used in the second phase of the method, data synthesis, to answer our research questions. The review will end by reporting on the results. Results and conclusions: The expected results of the review should provide an overview of attacks, vulnerabilities and threats that occur in ubiquitous computing and that have motivated the research in the last decade. Moreover, the review will indicate which security goals are gaining on their significance in the era of ubiquitous computing and provide a categorization of the security-related countermeasures, mechanisms and techniques found in the literature. (authors' abstract) / Series: Working Papers on Information Systems, Information Business and Operations
57

A systematic review regarding the emotional/psychological experiences of medically complicated pregnancies

Isaacs, Nazeema Zainura January 2018 (has links)
Magister Artium (Psychology) - MA(Psych) / Over time, the ‘normal’ experience of pregnancy transitioned to the hospital setting, leading to a discourse steeped in the notions of risks and complications. Risks and complications refer to health problems expectant women may experience, causing them to have a high-risk pregnancy. High-risk pregnancy refers to a pregnancy that negatively affects the health of the mother, the baby, or both, and evoking a range of emotional and psychological experiences. Research on high-risk pregnancy is predominantly found in the medical arena. Such research usually concerns the disease, while women’s emotional/psychological experiences are not sufficiently documented. For this reason, the objectives of this study was to explore the emotional and psychological experiences of women in the reviewed articles throughout their high-risk pregnancies, and identify the medical conditions and complications in the same reviewed articles. Ethics clearance was obtained from the senate research committee at UWC. The systematic review examined qualitative studies, including the qualitative components of mixed method studies published between January 2006 and June 2017. The databases that were searched are EbscoHost, JSTOR, Sage Journals Online, ScienceDirect, SpringerLink, Sabinet, Scopus, Emerald eJournals Premier, Pubmed, as well as Taylor and Francis Open Access eJournals. The study evaluated the literature found on these databases for methodological quality by using three stages of review (i.e. abstract reading, title reading, and full-text reading) and applying a meta-synthesis to the current evidence on the research topic. The findings provide empirical evidence based on sound research that medical conditions and complications (i.e. HELLP syndrome, thrombophilia, gestational diabetes, maternal near-miss syndrome, foetal abnormality, preterm birth, hypertension, and uterine rupture) are associated with women’s emotional and psychological experiences (i.e. fear, shock, feeling frightened, sadness, worry, alienation, frustration, grief, guilt, anger, ambivalence, despair, upset, loneliness and isolation, anxiety, depression, and PTSD) throughout their high-risk pregnancies. As a result of this, survivors of severe pregnancy complications have subsequent psychological and emotional challenges. It is therefore recommended that future researchers consider including quantitative studies in a systematic review on the same topic.
58

A systematic review of best practices in the acute management of postpartum haemorrhage in primary maternity care settings

Boltman-Binkowski, Haaritha January 2018 (has links)
Magister Curationis - MCur / Background: Postpartum haemorrhage (PPH) is one of the most preventable causes of maternal death, yet it still ranks as one of the main conditions responsible for maternal mortality. PPH occurs at a stage when a mother is the least likely to receive care, and mothers often do not survive to be referred to a more specialised level of care. This is compounded by the patient not being able to warn healthcare providers timeously about their condition and healthcare providers lacking training resulting in a lack of accuracy in diagnosis, lack of resources, and differing methods of treatment. Due to the lack of consensus in available treatment options, and the paucity of research aimed at clinical interventions for midwives at the primary care level, this research report aimed to investigate the evidence in order to establish the best practices and evidence for clinical interventions to manage postpartum haemorrhage for midwives at the primary care level. This is to ensure that the continuing education for midwives in practice is based on evidence to keep their skill set current and expose practitioners to the latest evidence based care. Aim: To systematically review all available published evidence for the acute non-pharmaceutical, non-surgical, management of PPH for use by midwives at a primary maternity care setting.
59

Cost-effectiveness of an Outpatient Uterine Assessment and Treatment Unit in Patients with Abnormal Uterine Bleeding

Bennett, Alexandria 25 July 2019 (has links)
Abnormal uterine bleeding (AUB) is one of the most common presenting complaints in our medical system with up to 30% of females affected by this condition. The current evaluation and management of AUB often requires multiple lengthy visits to both general practitioners and specialists. Advances in endoscopic technology have allowed clinicians to diagnose and treat women presenting with AUB in a single-visit within an outpatient uterine assessment and treatment unit (UATU). Unfortunately, the UATU is not the standard of care with very few locations in Canada providing this type of service. This thesis project aimed to synthesize data pertaining to efficacy and safety as well as to evaluate the cost-effectiveness of a UATU service model compared to usual care in diagnosing and treating AUB. To address the main aim for this thesis project, the first manuscript focuses on the hysteroscopic procedures that may be offered in a UATU. The manuscript includes a systematic review that synthesizes outcome measures surrounding efficacy, patient safety, and cost data of outpatient hysteroscopy compared to hysteroscopy performed in the operating room. The second manuscript is a cost-effectiveness modelling study that compares cost and effectiveness outcomes, including time to diagnosis and time to treatment of a UATU versus usual care for women who present with AUB. Data used to populate the cost-effectiveness model were obtained from a retrospective review of patient charts and the published literature. The systematic review found no statistically significant difference in the safety, efficacy, or patient tolerability between outpatient and intraoperative hysteroscopy procedures. This review helps provide further support for performing procedures outside of a traditional operating room without increasing patient harm or compromising efficacy. However, given the current available evidence and limited number of studies, findings should be interpreted with caution. The cost-effectiveness analysis found that a UATU is cost-effective when compared to usual care in diagnosing and treating patients who present with AUB. These two studies combined provide evidence to support that the UATU has the potential to improve gynecologic care by reducing wait-times to receiving diagnosis and treatment and to lower overall costs to the health care system.
60

Sistemática e análise filogenética de Epiperipatus Clark, 1913 baseada em dados moleculares e morfológicos (Onychophora: Peripatidae) / Systematic and phylogenetic analysis of Epiperipatus Clark, 1913 (Onychophora: Peripatidae) based on molecular and morphological data

Costa, Cristiano Sampaio 05 May 2016 (has links)
O grupo de onicóforos \"caraíbas\" apresenta grande diversidade de espécies, mas também gêneros fracamente delimitados. Epiperipatus Clark, 1913 é o maior dos gêneros neotropicais de Onychophora, mas ainda não sofreu revisão taxanômica. Este gênero foi incorporado no presente estudo, que contemplou o mais abrangente conjunto de dados moleculares, assistido por dados morfológicos. Quatro marcadores moleculares foram utilizados: cytochrome c oxidase subunit I (COI), 12S rRNA, 16S rRNA (mitochondriais) e 18S rRNA (nuclear). Além disso, trinta e três caracteres morfológicos foram levantados. A base de dados foi submetida a duas análises de Máxima Parcimônia (MP) e uma de Máxima Verossimilhança (ML). No total foram examinados 175 espécimes, cobrindo nove gêneros e vinte e nove espécies, dezoito delas pertencentes a Epiperipatus. Foi adotado como hipótese de trabalho o cladograma resultante da análise de evidência total que contemplou os dados moleculares e morfológicos. O resultado mostrou que os dados morfológicos não são capazes de resolver por si só as relações internas de Peripatidae, pois o número de caracteres morfológicos é menor que o número de terminais examinados. Peripatidae é suportado por dados moleculares e isso é conflitante com a delimitação morfológica tradicional dos gêneros da família. Isso demonstra que clados suportados por dados moleculares mostram elevada disparidade morfológica, que pode estar relacionada a adaptação a diferentes ambientes do clado Neotropical. Além disso, o resultado também sugeriu Epiperipatus como parafilético, pois engloba outros gêneros que devem ser sinonimizados. Epiperipatus apresentou estabilidade em três clados neotropicais, apesar de que Epiperipatus edwardsii (Blanchard, 1847) e outros quatro grupos mostraram posição instável. Para reconciliar a sistemática e a filogenia de Epiperipatus, os gêneros monotípicos Principapillatus Oliveira et al., 2014 e Cerradopatus Oliveira et al., 2015 devem ser considerados sinônimo-junior de Epiperipatus. Consequentemente, as novas combinações foram propostas: Epiperipatus hitoyensis (Oliveira et al., 2012) n. comb. e Epiperipatus sucuriuensis (Oliveira et al., 2015) n. comb.. Além disso, foram apresentadas e descritas as espécies novas Epiperipatus [sp1] n. sp., Epiperipatus [sp2] n. sp., Epiperipatus [sp10] n. sp., Epiperipatus [sp16] n. sp. e Epiperipatus [sp17] n. sp.. O enraizamento da filogenia de Onychophora em Peripatopsidae resultou no grupo Neotropical como grupo-irmão do grupo africano, e um aparente ancestral Asiático. A demonstrada monofilia de Epiperipatus confirmou sua larga distribuição, da mesma forma que Peripatus. Ambos os gêneros ocorrem da América Central ao Brasil. Entretanto, no Brasil enquanto Peripatus ocorre apenas no centro-oeste desse país, Epiperipatus é encontrado em quase todo o território desse país, com exceção da região sul / The \"caraibes\" onychophorans present both a large diversity and weakly defined genera. Epiperipatus Clark, 1913 is the largest genus, but it has not been revised so far. This genus is herein incorporated into the currently most comprehensive molecular phylogenetic analysis of Peripatidae, assisted by morphology. Four markers were used: cytochrome c oxidase subunit I (COI), 12S rRNA, 16S rRNA (mitochondrial) and 18S rRNA (nuclear). Moreover, 33 morphological characters were obtained. The dataset was used in two Maximum Parsimony (MP) and one Maximum Likelihood (ML) analyses. In a total of 175 specimens of Onychophora, nine genera and twenty-nine species were examined, eighteen of them belonging to Epiperipatus. We adopted as work hypothesis the MP based on total evidence. The result showed that morphological by itself cannot be used to resolve the phylogenetic relationships of this group, because the number of characters is smaller than the number of terminals examined. Here, Peripatidae was based on molecular data and this conflicts with the characters traditionally used to define genera in the family. It means that clades supported by molecular data shows high morphological disparity which might be reflected on the adaptation to different environments in the Caribbean clade. Also, the result suggests that Epiperipatus seems to be not monophyletic, as it includes others genera and these genera should be synonymized. Epiperipatus presented stable relationships across three clades of Neotropical onychophorans, but it was observed the unstable position of Epiperipatus edwardsii (Blanchard, 1847) and four groups also. To reconcile Epiperipatus systematics with the phylogeny, the monotypic genera Principapillatus Oliveira et al., 2014 and Cerradopatus Oliveira et al., 2015 should be considered as junior synonyms of Epiperipatus. Hence, the new combinations were proposed: Epiperipatus hitoyensis (Oliveira et al., 2012) n. comb. and Epiperipatus sucuriuensis (Oliveira et al., 2015) n. comb.. Moreover, the new species Epiperipatus [sp1] n. sp., Epiperipatus [sp2] n. sp., Epiperipatus [sp10] n. sp., Epiperipatus [sp16] n. sp. and Epiperipatus [sp17] n. sp. were presented and described here. Rooting the Onychophora phylogeny in Peripatopsidae resulted in the Neotropical group as the sister group relationship to the African species, and an apparently ancestral group from Asia. The demonstrated Epiperipatus monophily confirmed its widespread distribution, in the same way as Peripatus. Both are recorded from Central America to Brazil. However, in Brazil, while Peripatus occurs only until the Central-West region, Epiperipatus is found in all Brazilian territories, except in the South region

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