A interrupção do fluxo sanguíneo, ou isquemia, representa um dos problemas mais importantes de doenças cardiovasculares e cerebrovasculares enfrentados pelos médicos na sua rotina. Em relação ao miocárdio muitos estudos têm sido realizados nessa área e sabe-se que os anestésicos inalatórios e os opiódes podem protege as células cardíacas contra a lesão de isquemia e reperfusão. O propofol por sua parece não ter efeito de précondicionamento, porém apresenta características similares as ações antioxidantes da vitamina E, neutralizando os efeitos nocivos da produção de radicais livres. A associação de sevoflurano, sufentanil e propofol não está descrita na literatura. O objetivo deste estudo foi examinar a potencialização de cardioproteção entre sevoflurano, propofol e sufentanil por meio de análise do tamanho da área de infarto e inibição de apoptose em células miocárdicas. Ratos foram submetidos a 5 protocolos de pré-condicionamento diferentes e divididos em grupos agudos e crônicos. Os resultados indicaram que a associação destes anestésicos não conferiu proteção maior do que quando administrados isoladamente. Além disso, o sevoflurano conferiu proteção ao miocárdio no pós-infarto agudo e crônico. Já o propofol conferiu cardioproteção no pós-infarto crônico / The interruption of blood flow, or ischemia, represents one of the major problems of cardiovascular and cerebrovascular diseases seen by physicians in their routine. With respect to the myocardium, many studies have been conducted in this area and it is a known fact that inhaled anesthetics and opiates may protect cardiac cells against the ischemia and reperfusion injury. Propofol, in turn, seems to have no preconditioning effect, but it has similar characteristics to the antioxidant actions of vitamin E by neutralizing the harmful effects of free radical production. The combination of sevoflurane, sufentanil and propofol has not been described in literature. The aim of this study was to survey cardioprotection potentiation among sevoflurane, propofol and sufentanil by analyzing the size of infarct area and the inhibition of apoptosis in cardiac cells. Rats were subjected to five different preconditioning protocols and divided into acute and chronic groups. Results indicated that the combination of these anesthetics did not confer greater protection than when they were administered alone. Furthermore, sevoflurane conferred myocardial protection in the postacute and chronic infarction stage. Propofol, in turn, conferred cardioprotection in the chronic post-infarction stage

Submitted by Fabiana Gonçalves Pinto (benf@ndc.uff.br) on 2015-12-03T11:47:16Z No. of bitstreams: 1 Ana Paula Amorim Moreira.pdf: 2354952 bytes, checksum: f6129eae8a3f46d9bfa3f464dca30854 (MD5) / Made available in DSpace on 2015-12-03T11:47:16Z (GMT). No. of bitstreams: 1 Ana Paula Amorim Moreira.pdf: 2354952 bytes, checksum: f6129eae8a3f46d9bfa3f464dca30854 (MD5) Previous issue date: 2012 / Mestrado Profissional em Enfermagem Assistencial / A terapia intravenosa (TIV) é considerada mundialmente como um importante recurso terapêutico, sendo indicado para a maioria dos pacientes hospitalizados, representando por vezes uma condição básica no seu tratamento, trata-se de uma prática comum no cotidiano dos profissionais de Enfermagem. Nesse estudo trataremos das TIVs centrais e contínuas. Hoje temos a tecnologia e inovação ao nosso favor disponibilizando no mercado uma gama de produtos que irá contribuir para um cuidado de Enfermagem eficiente e seguro durante as TIVs. Por isso, a sensibilização dos hospitais para a qualidade é uma importante ferramenta na ampliação da segurança dos pacientes e na vigilância pós - comercialização. Têm-se como objeto desse estudo, as tecnologias em saúde utilizadas na TIV central contínua durante a assistência de Enfermagem. Foram traçados os seguintes objetivos: identificar as tecnologias em saúde disponíveis para uso durante a TIV central contínua no Centro de Terapia Intensiva (CTI), verificar a utilização dessas tecnologias pela equipe de enfermagem no cuidado às TIVs centrais contínuas instaladas nos pacientes internados no CTI e discutir os desafios no uso das tecnologias durante a TIV central contínua. Estudo descritivo de abordagem qualitativa realizado em um hospital universitário por meio de observação não participante norteada por roteiro com base nos padrões internacionais da Joint Commission International e entrevista semi estruturada. O corpus de dados obtidos a partir das entrevistas através do Softwear Alceste. Os resultados da observação foram agrupados em Estrutura, Processo e Resultado na utilização da TIV, dos quais pôde-se constatar: inexistência de monitoramento dos registros dos trabalhos pela engenharia clínica; de treinamentos com simulações práticas e testes documentados; não conformidade no manejo das tecnologias no preparo das TIVs; medicamentos de emergência indisponíveis, não monitorados e sem segurança. Dos dados resultantes das entrevistas emergiram duas categorias: As Tecnologias em Saúde nas Terapias Intravenosas Centrais Contínuas e Desafios no Manejo das Tecnologias em Saúde nas Terapias Intravenosas. Concluiu-se que o gerenciamento das tecnologias em saúde visa a organização do trabalho permitindo ao enfermeiro estabelecer prioridades durante sua prática, minimiza desperdícios com redução de custos, evita a ocorrência do (re)trabalho e principalmente fortalece a qualidade assistencial / The VIT is considered as an important therapeutic resource worldwide, and is indicated for the majority of hospitalized patients, representing sometimes a basic condition in its treatment, it is a common practice in the daily lives of nursing professionals. In this study we will deal with the continuous and central VITs. Today we have the technology and innovation to our favor making available on the market a range of products that will contribute to an efficient and safe Nursing care during the VITs. Therefore, the awareness of hospitals for the quality is an important tool in the expansion of patient safety and post-marketing surveillance. It has as an object of this study, the health technology used in continuous and central VIT during nursing care. The following objectives were tracings: identify the available health technology for use during the continuous and central VIT in Intensive Care Unit (ICU), check the use of these technologies by the nursing team in the care of continuous and central VITs installed in hospitalized patients in the ICC and discuss the challenges in the use of technologies during the continuous and central VIT. Qualitative descriptive study conducted in a university hospital by not participant means of observation guided by roadmap based on international standards of the Joint Commission International and semi structured interview. It was drawn up a corpus of data obtained from the interviews which was analyzed by Alceste Softwear. The results were grouped into structure, process and result in the use of VIT, noting: lack of monitoring of the records of the work by clinical engineering; trainings with practical simulations and documented tests; bad practices of technologies management in the preparation of VITs; unavailable emergency drugs, not monitored and no security. The interviews emerged two categories: The health technologies in continuous and central intravenous therapies and challenges in the health technologies management in intravenous therapies. It was concluded that the management of technologies in health aims to the organization of work allowing the nurse to establish priorities during his practice, minimizes waste with cost reduction, prevents the occurrence of (re)working and mainly strengthens health care quality

The Peripherally Inserted Central Catheter (PICC), or Peripherally Inserted Central Venous Catheter (PICVC), is an intravenous device inserted through a superficial vein of the extremity that progresses for the blood flow and for insertion procedures, until the third distal of the vena cava, stayed in central level. Currently, the nurse is the main responsible for assessing the need of the use of this device and is the most professional directly involved in the insertion, maintenance and prevention of complications. The aim of this study was: to understanding the role of nurses in the use of PICC in neonates and children in a teaching hospital. The specific aims were: to describe the role of nurses in the use of PICC in neonates and children in a teaching hospital; to analyze the risks and benefits of using PICC considering the patient safety in neonates and children in a teaching hospital and to discuss the limits and possibilities of the use of PICC in neonates and children in the context of a teaching hospital. It was a qualitative and exploratory-descriptive study realized of April to May 2012. The subjects were 20 nurses from the Pediatric Inpatient Unit, Neonatal Intensive Care Unit and Pediatric, Emergency Room Pediatric and Center of Bone Marrow Transplantation, of a teaching hospital in the southern Brazil. The Creative Sensitive Method, using three dynamics of sensitivity and creativity: Tree of Knowledge, Knowledge Body and Almanac. Data were sumitted to Discourse Analysis in this current French. The ethical aspects of the research were respected in accordance with Resolution 196/96 of the National Health Council, and the project was approved with the protocol number 00541812.6.0000.5346. The results indicate that the nurse holds a prominent position in the use of PICC in neonates and children, being that its preparation starts in the graduation, complemented with the legal training and extends into daily practice, racioning clinically and evaluating risks and benefits. The incorporation of new technologies in intravenous therapy brought the concern with the patient safety. The nurses have care to stabilize the child hemodynamically, manipulate your body the little possible and not to expose them to risk of infection, with observation of asseptic techniques. So, they choose carefully the acess and not exceed three attempts. In order to prevent the stress of the patient, family and group, should be pay attention in the guidance, analgesia and sedation. It is recommended to invidualization / uniqueness of each case with the implementation of the Systematization of Nursing Care (SNC), it enables the SNC, records and highlights the work of nurses. Thus, it is expected that this professional can assume and maintain autonomy in the face of indications, insertion, maintenance and removal of the PICC, working with technical and legal competence. Thus the nurse should be prepared for this activity developing it responsibly, conscious and preventive. / O Cateter Central de Inserção Periférica (CCIP), ou Peripherally Inserted Central Venous Catheter (PICC) é um dispositivo intravenoso inserido através de uma veia superficial da extremidade que progride, por meio da ajuda do fluxo sanguíneo e de procedimentos de inserção, até o terço distal da veia cava, ficando a nível central. Atualmente, o enfermeiro é um dos principais responsáveis pela avaliação da necessidade do uso desse dispositivo, além de ser o profissional mais diretamente envolvido na construção de protocolos institucionais. Assim, delimitou-se como objeto de estudo: a atuação das enfermeiras na utilização do PICC em neonatos e crianças em um hospital de ensino. O objetivo geral deste estudo foi compreender a atuação de enfermeiros na utilização do PICC em neonatos e crianças em um hospital de ensino. Os objetivos específicos foram: descrever as bases para a atuação dos enfermeiros na utilização do PICC em neonatos e crianças em um hospital de ensino; analisar os riscos e benefícios da utilização do PICC no cenário de estudo e discutir os limites e possibilidades da utilização do PICC em neonatos e crianças no contexto de um hospital de ensino. Tratou-se de um estudo qualitativo de caráter exploratório-descritivo, realizado de abril a maio de 2012. Os sujeitos foram 20 enfermeiros da Unidade de Internação Pediátrica, Unidade de Terapia Intensiva Neonatal e Pediátrica, Pronto Socorro Pediátrico e Centro de Transplante de Medula Óssea, de um hospital de ensino no sul do Brasil. Foi aplicado o Método Criativo Sensível, por meio de três Dinâmicas de Sensibilidade e Criatividade: Árvore do Conhecimento, Corpo Saber e Almanaque. Os dados foram submetidos à Análise de Discurso em sua corrente francesa. Os resultados apontam que o enfermeiro ocupa posição de destaque na utilização do PICC em neonatos e crianças, sendo que seu preparo inicia na graduação, complementa-se com a capacitação legal e estende-se na prática diária, raciocinando clinicamente e avaliando riscos e benefícios. A incorporação de novas tecnologias em terapia intravenosa traz a necessidade de atenção redobrada com a segurança do paciente. As enfermeiras tem o cuidado de estabilizar, hemodinamicamente, a criança, manipular o mínimo possível seu corpo e não a expor ao risco de infecção, com observação de técnicas assépticas. Para tanto, escolhem criteriosamente o local de acesso e não excedem três tentativas. Para prevenir o estresse do paciente, equipe e familiares deve-se atentar para as orientações, a analgesia e a sedação. Recomenda-se a invidualização/singularização de cada caso com a implementação da sistematização da assistência de enfermagem, pois esta viabiliza, registra e evidencia o trabalho do enfermeiro. Assim, espera-se que esse profissional possa assumir e manter a autonomia diante da indicação, inserção, manutenção e retirada do PICC, atuando com competência técnica e legal. Desse modo, o enfermeiro deve buscar capacitação continuada para assumir esta atividade desenvolvendo-a de forma responsável, consciente e preventiva.

Despite great technological advances in coronary artery bypass grafting (CABG) surgery, there is a high incidence of cardiac dysfunction and neurocognitive deficits in the postoperative period. Preventive measures are essential to reducing these adverse situations that are responsible for significant morbidity and impairment on life quality of these patients. Surgery and cardiopulmonary bypass (CPB) produces important changes in the immune system, directly involved in the incidence of these complications and is credible that anesthesia choice can it modified. We hypothezised that dexmedetomidine, an (α)-2-agonist, could the inflammatory response to CABG and CPB modified. In a prospective and randomized study, we intend to demonstrate the influence of dexmedetomidine (TIVA-DEX group), as a component of a conventional total intravenous anesthesia (TIVA-propofol+sufentanil) in patients undergoing CABG, with mini-CPB, on the behavior of this inflammatory response. The TIVA-DEX group received a continuous infusion of dexmedetomidine associated to a conventional venous anesthesia (continuous infusion of propofol+sufentanil). Intraoperative dosage of cytokines, such as interleukin-1 (IL-1), interleukin-6 (IL-6), interleukin-10 (IL-10), gamma interferon (INF-γ) and tumor necrosis factor (TNF-α) were performed, and also C-reactive protein (CRP), creatine phosphokinase (CPK), creatine phosphokinase-MB (CPK-MB), I troponin (cTnI), cortisol and glucose. The occurrence of lipid peroxidation, by the study of thiobarbituric acid reactive substances (TBARS) and the activity of delta-aminolevulinate dehydratase (δ-ALA-D) to oxidative stress verify were also avaliated. Dexmedetomidine induce a significative reduction of IL-1, IL-6, TNF-α and INF-γ, as compared to group that not receive dexmedetomidine. The levels of IL-10 were decreased in both groups along the time, at a similar pattern. Differences between groups on δ-ALA-D activity do not occur and TBARS was higher in TIVA-DEX group. We concluded that dexmedetomidine associated to TIVA was able to reduce plasma levels of proinflammatory cytokines IL-1, IL-6, TNF-α and INF-γ in patients submitted to CABG surgery under mini-CPB, as compared to a conventional TIVA. These results reinforce literature data about dexmedetomidine potentiality as an anti inflammatory agent. / Apesar dos grandes avanços tecnológicos nas cirurgias de revascularização miocárdica (CRM), ocorre uma grande incidência de disfunção cardíaca e déficit neurocognitivo no período pós-operatório. As medidas preventivas são essenciais para a redução destas situações adversas, responsáveis pelo comprometimento da qualidade de vida dos pacientes. A cirurgia e a circulação extra-corpórea (CEC) produzem alterações importantes no sistema imunológico, diretamente envolvidas na incidência das complicações e acredita-se que a escolha anestésica possa modificá-las. Em estudo prospectivo e randomizado, pretendemos demonstrar a influência da dexmedetomidina (grupo AIVT-DEX), um anestésico (α)-2-agonista, associado à anestesia intravenosa total (AIVT) no comportamento da resposta inflamatória em pacientes submetidos à CRM, sob mini-circulação extracorpórea (mini-CEC). O grupo AIVT-DEX recebeu infusão contínua de dexmedetomidina associado à técnica de AIVT convencional e o outro grupo foi submetido à AIVT convencional (infusão contínua de propofol e sufentanil). Os grupos foram comparados pela dosagem plasmática trans-operatória de citocinas, como a interleucina-1(IL-1), a interleucina-6 (IL-6), a interleucina-10 (IL-10), o interferon gama (INF-γ) e o fator de necrose tumoral alfa (TNF-α), bem como a proteína C reativa (PCR), creatinofosfoquinase (CPK), creatinofosfoquinase miocárdio específica (CPK-MB), troponina I (cTnI), cortisol e glicose. A peroxidação lipídica foi avaliada pelo estudo das substâncias reativas ao ácido tiobarbitúrico (TBARS) e a presença de estresse oxidativo pela atividade da enzima delta-aminolevulinato desidratase (δ-ALA-D). O uso da dexmedetomidina induziu redução significativa de IL-1, IL-6, TNF-α e INF-γ se comparado ao grupo sem dexmedetomidina. Houve redução progressiva dos níveis de IL-10 ao longo do tempo, de forma semelhante entre os grupos. Não houve diferença entre os grupos para a atividade da enzima δ-ALA-D e os níveis de TBARS foram maiores no grupo AIVT-DEX. Concluímos que a dexmedetomidina associada à AIVT convencional foi capaz de reduzir os níveis plasmáticos das citocinas pró-inflamatórias IL-1, IL-6, TNF-α e INF-γ em pacientes submetidos à CRM sob mini-CEC, se comparados aos pacientes que receberam apenas a AIVT convencional. Estes resultados reforçam os dados da literatura quanto à potencialidade da dexmedetomidina como agente modulador da resposta inflamatória no período trans- operatório.

The aim of this study is to evaluate the supply of markers for the identification of syringes distributed by pharmacy needle exchanges and to determine if this product and service delivery offers a feasible method of marking syringes to promote the reduction of accidental sharing of syringes and needles amongst injecting drug users (IDU) and thereby reduce the risk of transmission of blood borne viruses (BBVs) and other related infections. This study involves the assessment, implementation and evaluation of syringe markers as a pilot study within three community pharmacy sites in Glasgow. The secondary aims of the study were to identify whether the supply of syringe markers from community pharmacy needle exchanges was acceptable to IDU and if it enabled them to mark their syringes. The literature review demonstrates that providing a means of identification of personal injecting equipment has been proposed as a viable option that should be promoted to prevent the inadvertent accidental sharing of syringes within a group setting. Needle exchanges (NEX) are important component parts of the harm reduction responses designed to reduce the physical health harms caused to individuals through injecting drug use. The literature is reviewed on BBV transmission and the historical, legal and policy context associated with the development of NEXs. Community pharmacies act as a source of health advice and can help to facilitate access to treatment services for those attending the NEX. However the specific aim of this study is not to investigate the totality of the benefits of a NEX but to examine the supply of a potential means of reducing accidental and unintentional sharing of all injecting equipment and thereby contribute to minimising some of the health harms linked to injecting drug use. Three established community pharmacies were identified as suitable sites to pilot the supply of syringe markers. A number of criteria were used to select the sites. These included an assessment of the geographic locations, staffing arrangements, NEX attendances and transactional activity and the availability of private consultation facilities. The health board central database which holds records on a range of factors including, the characteristics of those who attend NEX and detailed information on all transactions, was used to identify the most suitable sites to pilot the new intervention. This indicated that the characteristics of those who attended the three chosen sites were broadly similar to the wider NEX attending population. The evaluation was conducted in two separate periods. The first 4 week period was the supply phase where markers were distributed over this period to all patients receiving NEX packs from the 3 pharmacies. The second data collection phase was undertaken in the following 4 week period. Data was collected by means of a structured questionnaire. In order to reduce the potential interviewer bias it was decided to incorporate the use of peer researchers in the administration of the questionnaire. The Scottish Drugs Forum (SDF) was approached and agreement was reached to use members of the Service User Involvement Group (SUIG) to assist with the design and administration of the questionnaire. A submission was made to the health board Research Ethics Committee (REC) and approval was given to enable the study and the research evaluation to proceed. Before the start of the study, joint briefing and training sessions were held for pharmacy staff from the 3 sites and the 6 participating SUIG members. A total of 177 questionnaires were completed during the second data collection phase of the evaluation. Information was collected on personal details and injecting behaviours (including deliberate and accidental sharing), any current means of syringe identification, use of the markers and on the usefulness of the instruction card. Most individuals (75%, n=132) had been supplied with the markers to trial during the first supply phase of the study with 63% of the 132 (n=83) of those individuals reporting use of the markers. The results of the evaluation and subsequent analysis of the findings indicated that the syringe marker supply could be successfully implemented using pharmacy NEXs. The product and the supply method were acceptable to both staff and service users. Initial bivariate analysis was conducted using a number of dependent and independent variables identified within the questionnaire. These findings highlighted a number of areas worthy of further exploration, including emerging differences between male and female respondents, and indicated specific target groups for future developments in syringe identification. The contribution of the peer researchers was found to be a significant factor in successfully completing the evaluation. However it is not possible to make any definitive statements on how effective the intervention is in terms of reducing the transmission of BBVs and other related infections. The findings of the evaluation indicated a number of potential areas of work that could be usefully explored to investigate the effectiveness of the markers in reducing the transmission of infections. The limitations of the evaluation became apparent during the course of the study and the implications of these limitations are discussed.

Tau protein, a microtubule-associated protein localized in axonal projections of neurons, is a key molecule in the pathology of Alzheimer's disease (AD), the most common cause of dementia in the elderly population. Tau belongs to the group of natively unfolded proteins without globular structure and is prone to numerous posttranslational modifications (PTMs). Under pathological conditions, abnormal PTMs and misfolding of tau protein occurs and leads to oligomerization and aggregation into paired helical filaments forming neurofibrillary tangles, the histopathological hallmark of AD. Currently available drugs applied in AD treatment can only slow the disease progression and those, which halt the AD-specific neurodegenerative processes, are still missing. Very promising and evolving therapeutic approach is immunotherapy, and even immunomodulation by administration of intravenous immunoglobulin (IVIG) products, a reservoir of natural antibodies from the plasma of healthy donors, has been already tested. The discovery of naturally occurring antibodies directed to tau (nTau-Abs) in body fluids of both AD and healthy subjects and their presence in IVIG begin the investigation of their therapeutic potential. Considering a wide range of possible modifications of tau and of various tau species (oligomers,...

Introduktion: I dag är det många äldre som vårdas i hemmet med avancerad hemsjukvård. En ökning av antal äldre personer i samhället kommer sannolikt leda till ökat antal patienter med central venös infart i prehospital vård.Syfte: Syftet med studien var att studera sjuksköterskors upplevelser av befintliga centrala venösa infarter vid prehospital vård. Forskningsfrågorna var hur sjuksköterskorna upplevde användning av central venös infart och deras upplevelse av vad som påverkade valet av venös infart.Metod: Metoden som användes var deskriptiv kvalitativa design med semistrukturerade intervjuer av tjugo sjuksköterskor som arbetade inom Ambulanssjukvården i Region Dalarna. Samtliga sjuksköterskor hade arbetat mer än fem år inom ambulanssjukvård. Analysen av intervjuerna genomfördes genom innehållsanalys.Resultat: Resultatet visade att de intervjuade sjuksköterskorna upplevde osäkerhet, bristande erfarenhet och bristande stöd. Detta var avgörande för deras upplevelse av centrala venösa infarter. Det fanns skillnader i sjuksköterskornas kunskap avseende hantering av centrala venösa infarter. En annan faktor var en tydlig och stark vilja hos de intervjuade att inte göra fel och att inte skada.Slutsats: Slutsatsen av studien visade att Sjuksköterskorna önskade mer kunskap och ett kunskapsstöd i form av behandlingsriktlinjer samt möjligheter att öva. / Introduction: Today, numerous elderly people are cared for at home with advanced home health care. An increase in the number of elderly people in society is likely to lead to a rice in the number of patients with central venous access in prehospital care.Purpose: The purpose of the study was to investigate nurses' experiences of existing central intravenous inline in prehospital care. The research questions were how the nurses experienced the use of central venous access and their experience of what influenced the choice of venous access.Method: The method was based on descriptive qualitative semi-structured interviews with twenty nurses working in Ambulance Care in Region Dalarna. All nurses had more than five years work experience in ambulance care. The answers of the interviews have been compiled through a content analysis.Results: The result presented that almost all the nurses interviewed perceived their own insecurity or uncertainty with their colleagues when it comes to managing central intravenous catheters. There were differences in knowledge among the nurses to manage central intravenous catheters.Conclusion: The conclusion of the study showed that the Nurses wanted more knowledge and the results showed that the interviewed nurses experienced uncertainty, shortage of experience and of support. This was crucial for their experience of central venous entrances. There were differences in the nurses' knowledge regarding the management of central venous entrances. Another factor was a distinct and strong will of the interviewees not do mistakes and not to hurt knowledge support in the form of treatment guidelines and opportunities to practice.

Infusion pumps are used in all departments of a hospital, in the emergency care unit as well as in pediatrics. The pumps administer intravenous medications for the purpose of helping patients to manage pain and are unfortunately not spared from emerging errors. Due to the complexity of the process involved in infusion pumps, errors regarding delay in administration are encountered. Especially vulnerable to errors are pediatric patients, due to the high risk of over- or under-dosing. This study aims to investigate the effects on administration delay by analysing the medical supply and system utilized for the infusion pumps. This is accomplished through implementation of Compartmental Modeling in Pharmacokinetics in combination with a self developed mathematical model for estimating the administration delay. Simulations were performed for analysing how various sizes of medical supply effected delay time. The result from the computed mathematical model indicates that increased volumes on utilized equipment will increase delay time. The combined use of a decreased flow rate and smaller equipment sizes will have the greatest affects on the delay in administration. The result obtained from the computed compartmental model can be useful for medical staff to be able to estimate the delay in administration. However, further validation is required before the utilization of the model can be applied in hospitals. / Infusionspumpar används på alla avdelningar på ett sjukhus, inom akutvården samt inom pediatrik. Pumparna administrerar olika mediciner i syfte att hjälpa patienten att hantera smärta och är tyvärr inte förskonade från att fel kan förekomma. På grund av komplexiteten i processen, involverad i infusionspumpar, uppstår fel gällande förseningar i administrering av medicin. Speciellt sårbara för dessa typer av förseninigar är pediatriska patienter, på grund av den förhöjda risker gällande över- eller underdosering. Denna studie syftar till att undersöka effekterna gällande administreringsfördröjning genom att analysera det medicinska utrustningen och systemet som används för infusionspumparna. Detta uppnås genom implementering av kompartmentmodellering i farmakokinetik i kombination med en egenutvecklad matematisk modell för att uppskatta administreringsfördröjningen. Simuleringar utfördes för att analysera effekterna av olika storlekar på medicinsk utrustning i förhållande till fördröjningen av administreringe. Resultatet från den beräknade matematiska modellen indikerar att ökade volymer gällande den medicinska utrustningen kommer att öka fördröjningstiden. Den kombinerade användningen av en minskad flödeshastighet och mindre utrustningsstorlekar kommer att ha störst inverkan på förseningen i administreringen. Resultatet som erhålls från den beräknade kompartmentmodellen kan vara användbar för sjukvårdspersonal för att kunna uppskatta förseningen i administrationen. Ytterligare validering krävs dock innan användningen av modellen kan tillämpas på sjukhus.

<p dir="ltr">Progress in deep learning methodologies has transformed the landscape of medical image analysis, opening fresh pathways for precise and effective diagnostics. Currently, multi-phase liver CT scans follow a four-stage process, commencing with an initial scan carried out before the administration of <a href="" target="_blank">intravenous (IV) contrast-enhancing material</a>. Subsequently, three additional scans are performed following the contrast injection. The primary objective of this research is to automate the analysis and prediction of 50% of liver CT scans. It concentrates on discerning patterns of intensity change during the second, third, and fourth phases concerning the initial phase. The thesis comprises two key sections. The first section employs the non-contrast phase (first scan), late hepatic arterial phase (second scan), and portal venous phase (third scan) to predict the delayed phase (fourth scan). In the second section, the non-contrast phase and late hepatic arterial phase are utilized to predict both the portal venous and delayed phases. The study evaluates the performance of two deep learning models, U-Net and U²-Net. The process involves preprocessing steps like subtraction and normalization to compute contrast difference images, followed by post-processing techniques to generate the predicted 2D CT scans. Post-processing steps have similar techniques as in preprocessing but are performed in reverse order. Four fundamental evaluation metrics, including <a href="" target="_blank">Mean Absolute Error (MAE), Signal-to-Reconstruction Error Ratio (SRE), Peak Signal-to-Noise Ratio (PSNR), and Structural Similarity Index Measure (SSIM), </a>are employed for assessment. Based on these evaluation metrics, U²-Net performed better than U-Net for the prediction of both portal venous (third) and delayed (fourth) phases. Specifically, U²-Net exhibited superior MAE and PSNR results for the predicted third and fourth scans. However, U-Net did show slightly better SRE and SSIM performance in the predicted scans. On the other hand, for the exclusive prediction of the fourth scan, U-Net outperforms U²-Net in all four evaluation metrics. This implementation shows promising results which will eliminate the need for additional CT scans and reduce patients’ exposure to harmful radiation. Predicting 50% of liver CT volumes will reduce exposure to harmful radiation by half. The proposed method is not limited to liver CT scans and can be applied to various other multi-phase medical imaging techniques, including multi-phase CT angiography, multi-phase renal CT, contrast-enhanced breast MRI, and more.</p>

No description available.