Diss. (sammanfattning) Uppsala : Uppsala universitet, 2005. / Härtill 5 uppsatser.

Thesis (Ph.D.)--Drexel University, 2009. / Includes abstract and vita. Includes bibliographical references (leaves 104-115).

Thesis (M.S.)--Brigham Young University. Dept. of Electrical and Computer Engineering, 2005. / Includes bibliographical references (p. 275-278).

京都大学 / 0048 / 新制・課程博士 / 博士(医学) / 甲第22827号 / 医博第4666号 / 新制||医||1047(附属図書館) / 京都大学大学院医学研究科医学専攻 / (主査)教授 井上 治久, 教授 髙橋 良輔, 教授 Shohab YOUSSEFIAN / 学位規則第4条第1項該当 / Doctor of Medical Science / Kyoto University / DFAM

No / Background Meningiomas are the most common type of intracranial tumor, accounting for between 24 and 30 % of primary intracranial tumors. Thus far, no biomarkers exist to reliably predict the clinical outcome of meningiomas. A previous genome-wide methylation analysis revealed that HOXA9 is one of the most functionally relevant biomarkers. In this study, we have examined whether HOXA9 is a potential therapeutic target in meningiomas, using HXR9, a peptide inhibitor of the interaction between HOXA9 and its cofactor PBX. Methods We determined the expression level of HOXA9 in human meningiomas, meningioma cell lines, and normal brain tissue. Meningioma in culture and in subcutaneous tumors was treated with HXR9. We also examined the disruption of HOXA9/PBX dimers. Results We first confirmed that HOXA9 is highly expressed in meningiomas, but not in normal brain tissue. The HXR9 peptide blocks the binding of HOXA9 to PBX, leading to an alteration of DNA binding, and subsequent regulation of their target genes. HXR9 markedly inhibited the growth of meningioma cells and subcutaneous meningeal tumors. Conclusion There is no effective chemotherapy for meningiomas at present, and targeting the HOXA9/PBX interaction may represent a novel treatment option for this disease.

Prolonged or untreated intracranial pressure (ICP) can have devastating and life threatening effects. If left untreated, significant brain damage or death can occur as a result of a vicious cycle of destruction. Although clinical signs and symptoms are present with increases in intracranial pressure, ICP monitoring is the "gold standard" for assessment of intracranial pressure. Unfortunately, ICP monitoring is utilized only 50% of the time that it is indicated in the U.S. due to risks such as hemorrhage, infection, and technical malfunctions. Findings in the literature identify variables associated with infection risk when ICP monitoring devices are utilized. Factors associated with an increased risk of infection include indications for monitoring (subarachnoid or intraventricular hemorrhage), concurrent infection, duration and number of devices utilized, manipulation, and dislodgement. Other factors that may be associated with infection risk included corticosteroid use and location where the device is placed. Catheters impregnated with silver or antibiotics are associated with a decreased risk of infection. Variables deemed unimportant in regard to infection risk included age, gender, severity of illness, GCS score, CSF leak, who places the device, routine CSF sampling, prophylactic antibiotics, antibiotic irrigation, and prophylactic catheter exchange. None of the current literature is focused on nursing care. This is unfortunate, as the care nurses provide is integral to infection prevention associated with such devices. Future nursing research must address this lack of imperative information.

Despite facing technical issues (e.g., overfitting, vanishing and exploding gradients), deep neural networks have the potential to capture complex patterns in data. Understanding how depth impacts neural networks performance is vital to the advancement of novel deep learning architectures. By varying hyperparameters on two sets of architectures with different depths, this thesis aims to examine if there are any potential benefits from developing deep networks for segmenting intracranial aneurysms from 3D TOF-MRA scans in the ADAM dataset. / Master of Science / With the technologies we have today, people are constantly generating data. In this pool of information, gaining insight into the data proves to be extremely valuable. Deep learning is one method that allows for automatic pattern recognition by iteratively improving the disparity between its prediction and the ground truth. Complex models can learn complex patterns, and such models introduce challenges. This thesis explores the potential benefits of deep neural networks whether they stand to gain improvement despite the challenges. The models will be trained to segment intracranial aneurysms from volumetric images.

The goal of thesis "nursing care of patients with implemented intracranial sensor" was to analyze nursing care of patients on neurosurgical and critical care units in hospitals of the capital city of Prague. Main objectives were to understand whether there are nursing standards for "Nursing care for patients with established intracranial sensor", how nurses care for patients with increased intracranial pressure, if they have an experience with complications with patients with implemented ICP sensor and finally if they know the main complications that can potentially occur. The theoretical part describes the most common causes of brain damage and associated causes of intracranial hypertension, summarizes the types of sensors for monitoring intracranial pressure and ways of their implementation. It also deals with the specifics of nursing care associated with monitoring of intracranial hypertension. Quantitative research was chosen as methodology for this work. Data for the research was collected through anonymous questionnaire with nursing staff. The result was a finding that none of the cooperating departments have prepared a standard of nursing care for patients with an implemented ICP sensor, and that the majority of interviewed staff were not able to answer correctly if that standard in their...

A hidrocefalia ainda é um desafio no que diz respeito ao diagnóstico, tratamento e acompanhamento na população pediátrica. O tratamento, por meio das derivações ventriculares ou ventriculostomias endoscópicas, está bem estabelecido. Contudo, o diagnóstico de mau funcionamento das derivações, associado à hipertensão intracraniana, permanece um problema, especialmente em crianças menores e com fontanelas não patentes. Os exames radiológicos, tais como: ultrassonografia, tomografia computadorizada e ressonância magnética, possibilitam apenas o acesso indireto à pressão intracraniana, enquanto os métodos para sua avaliação direta podem apresentar riscos e raramente são utilizados em crianças. O objetivo deste estudo foi avaliar um dispositivo não invasivo para acessar alguns parâmetros da curva de pressão intracraniana em crianças portadoras de hidrocefalia. Para tanto, foi realizado um estudo descritivo-analítico, não experimental, prospectivo. A amostra foi composta por indivíduos menores de 18 anos, incluindo 28 pacientes portadores de hidrocefalia e 28 crianças em seguimento rotina de puericultura (grupo controle). Os participantes foram divididos em quatro grupos: grupo A: hidrocefalia compensada clinicamente; grupo B: pacientes com hidrocefalia, sem sinais clínicos sugestivos de hipertensão intracraniana e já submetidos à cirurgia para tratamento da hidrocefalia; grupo C: pacientes com hidrocefalia aguda e hipertensão intracraniana; grupo D: crianças sem qualquer doença neurológica (controle). Os dados foram coletados entre 2014 e 2016, por meio da instalação de um sensor extracraniano de deformação, acoplado sobre o couro cabeludo, com registro da curva de pressão intracraniana não invasiva. A análise dos dados foi realizada com software Freemat® 4, Origin Pro® 8 e R® 3.1.3. Foram analisados parâmetros obtidos na curva de pressão intracraniana como \"relação P2/P1\", \"classificação de P1 e P2\" (P1>P2 ou P2>P1) e \"inclinação de P1\". Os resultados apontaram, que na amostra estudada, o índice P2>P1 apresentou sensibilidade de 80% e especificidade de 100%, a \"classificação de P1 e P2\" sensibilidade de 100% e especificidade de 80% para predição de hipertensão intracraniana em hidrocefalia, sendo que a \"inclinação de P1\" não apresentou relação estatística. Conclui-se que, apesar de limitações operacionais, o método de monitorização não invasiva da pressão intracraniana se mostrou útil na detecção de hipertensão intracraniana e apresenta perspectivas de aplicação clínica futura. / Hydrocephalus is still a challenge regarding diagnosis, treatment and monitoring in the pediatric population. Currently, treatments by ventricular or endoscopic ventriculostomies are well established. However, to date, the diagnosis of malfunctioning shunts associated with intracranial hypertension remains a problem, especially in young children and without patent fontanelles. Radiological examinations, such as ultrasonography, computerized tomography and magnetic resonance, allow only an indirect access to the intracranial pressure, whilst methods for direct assessment may present risks and therefore are rarely used in children. The aim of this study was to evaluate a noninvasive device to assess some parameters of the intracranial pressure curve in children with hydrocephalus. For this, we performed a prospective and non-experimental descriptive-analytic study. The sample consisted of children (under 18 years), including 28 patients with hydrocephalus and 28 children following routine child care (control group). Participants were divided into four groups; Group A: children with clinically compensated hydrocephalus; B: patients with hydrocephalus, but with no clinical signs of intracranial hypertension and no history of medical surgery for the treatment of hydrocephalus; C: patients with acute intracranial hypertension due to hydrocephalus, and D: children without neurological disease (control). Data were collected between 2014 and 2016, through the installation of an extracranial deformation sensor, coupled to the children\'s scalp, which allowed registration of non-invasive intracranial pressure curves. Data analysis was performed using Freemat® 4, Origin Pro® 8 and R® 3.1.3 software. Parameters obtained from the intracranial pressure curves were analyzed, such as \"ratio P2 / P1\", \"classification P1 and P2\" (P1> P2 or P2> P1) and \"P1 slope.\" The results showed that P2>P1 index had a sensitivity of 80% and specificity of 100%, while the \"classification of P1 and P2\" had 100% of sensitivity and 80% of specificity for predicting intracranial hypertension. \"P1 slope\" presented no statistical difference. In summary, despite some operational limitations, this study showed an useful and non-invasive method for monitoring intracranial pressure, which was able to indicate the intracranial hypertension in children with hydrocephalus and, thus, should be further investigated for clinical applications.

As últimas estimativas da Organização Mundial da Saúde mostram a ocorrência de 14,1 milhões de novos casos de câncer em 2012. Sendo que desses casos, 8,2 milhões virão a óbito. Os tumores paravertebrais e intracraniais, também chamados de cânceres do Sistema Nervoso Central, tem origem no cérebro, nervos cranianos e meninges. Uma nova modalidade de braquiterapia começou a ser usada nesta última década. Neste procedimento, placas poliméricas flexíveis, carregando fósforo-32, são colocadas próximas ou em contato ao tumor para o tratamento. Este tratamento apresenta vantagens em relação aos demais porque aplica uma alta taxa de dose no tumor poupando tecidos sadios. A produção destas placas ainda é pouco estudada, embora já existam resultados satisfatórios no seu uso para o tratamento dos cânceres do sistema nervoso central. Neste trabalho foram realizados estudos iniciais para a produção deste tipo de placas poliméricas para braquiterapia. Foram avaliadas as propriedades mecânicas e a capacidade de imobilização de material radioativo de duas resinas comercias, uma poliuretânica e outra epoxídica, com e sem presença de substrato de policarbonato. Os testes iniciais apontaram o uso da resina epoxídica como melhor alternativa e com o uso dela foram feitos os primeiros protótipos e testes. O uso do policarbonato como substrato não foi necessário em uma das metodologias, facilitando o procedimento, mas oferecendo uma barreira menor de segurança. Os ensaios de tração mostraram que a adição de solução ácida à resina epóxi alterou suas características mecânicas, mas houve uma pequena melhora em sua flexibilidade. Os testes de adesão evidenciaram uma melhor adesão da resina à face texturizada do policarbonato. A termogravimetria mostrou que a solução ácida adicionada a resina fica presa à estrutura mesmo com elevações de temperatura acima de 100°C. A resina epoxídica utilizada teve a capacidade de incorporar o material radioativo em forma de solução ácida e manter-se estanque após testes de esfregaço e imersão em líquido quente. De acordo com os resultados obtidos, a produção destas placas com resina epoxídica é possível e atende às normas internacionais de segurança contra vazamento de material radioativo para fontes utilizadas em braquiterapia. / The latest estimates of the World Health Organization show the occurrence of 14.1 million new cases of cancer in 2012. From these cases, 8.2 million will come to death. The paraspinal and intracranial tumors, also called central nervous system cancers, are originated in the brain, cranial nerves and meninges. A new brachytherapy modality began to be used in the last decade. In this procedure, flexible, polymeric plaques carrying phosphorus-32 are placed in contact or close to the tumor for treatment. This treatment has advantages over others because it applies a high dose rate in the tumor sparing healthy tissues. The production of these plaques is not well known, although there are satisfactory results in its use for the treatment of central nervous system cancers. This work carried out initial studies for the production of this type of polymer plaques for brachytherapy. The mechanical properties and immobilization capacity of radioactive material, from two commercial resins, epoxy and polyurethane, with or without the presence of polycarbonate as substrate were evaluated. Initial tests showed the use epoxy resin as the best alternative and the first prototypes and tests with use of it were made. The use of polycarbonate as a substrate was not required on one of the methodologies, facilitating the procedure but offering a lower security barrier. The tensile tests showed that addition of acid to the epoxy resin solution changed its mechanical properties, but there was a small improvement in flexibility. Adhesion tests showed better adhesion of the resin to the textured surface of the polycarbonate. The thermogravimetric analysis showed that the acid solution added to the resin structure is sealed even with temperature rises above 100°C. The epoxy resin used has the ability to incorporate the radioactive material in the form of acid solution and remain tight after wiping and immersion in hot liquid tests. According to the results, the production of these plaques with epoxy resin is possible and meets international safety standards for leakage of radioactive material in radioactive sources used in brachytherapy.