Orientador: Desanka Dragosavac / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Ciências Médicas / Made available in DSpace on 2018-08-23T05:41:33Z (GMT). No. of bitstreams: 1 Fusatto_HelenaAmaralGoncalves_M.pdf: 1612494 bytes, checksum: 6a0555f472010bd45b7020a576214e54 (MD5) Previous issue date: 2013 / Resumo: Introdução: A disfunção pulmonar é frequente no pós operatório de cirurgias cardíacas com o emprego da circulação extracorpórea e pode contribuir para o aumento do tempo de ventilação mecânica (VM). Além disso, fatores pré e perioperatórios tais como idade avançada, gênero feminino, baixa fração de ejeção, síndrome de baixo débito cardíaco, tempo de circulação extracorpórea prolongado (CEC) e uso do balão intra-aórtico (BIA) podem retardar a extubação bem como contribuir para o insucesso deste procedimento. O tempo aumentado de ventilação mecânica está associado à maior tempo de permanência na unidade de terapia intensiva (UTI) e mortalidade hospitalar. Objetivos: Avaliar os parâmetros de troca gasosa e fatores pré e perioperatórios associados ao tempo prolongado de VM, internação na UTI, insucesso da extubação e mortalidade hospitalar em pacientes submetidos à cirurgia eletiva de revascularização do miocárdio com ou sem reconstrução do ventrículo esquerdo que utilizaram BIA no período intra e pós operatório. Método: Estudo observacional no qual foram analisadas variáveis respiratórias, clínicas, demográficas e cirúrgicas que posteriormente foram relacionadas com os seguintes desfechos: tempo de ventilação mecânica, tempo de internação na UTI, insucesso na extubação e mortalidade hospitalar. Resultados: Foram avaliados 39 pacientes com idade média 61,2 anos e vinte e cinco dos 39 (64,1%) pacientes eram do gênero masculino. A disfunção pulmonar esteve presente no pós operatório imediato até o terceiro pós operatório, caracterizada por síndrome do desconforto respiratório agudo (SDRA) de grau leve. O tempo médio de VM foi de 94,4 horas e apresentou influência do tempo de uso do BIA e PaO2/FiO2 no POI, na análise univariada e na análise múltipla acrescentou-se o gênero feminino e o tabagismo. O tempo médio de internação na UTI foi de 15,1 dias e as variáveis que mais influenciaram este desfecho foram APACHE II e tempo de uso de BIA nas análises univariada e múltipla. O insucesso na extubação ocorreu em 18 (46,15%) dos 39 pacientes estudados e nenhuma das variáveis analisadas apresentaram influência sobre este evento. O óbito ocorreu em 19 (48,72%) dos 39 pacientes e apresentou forte influencia do APACHE II seguido do insucesso da extubação. Conclusão: A disfunção pulmonar esteve presente do pós operatório imediato até o terceiro pós operatório. O tempo de VM foi influenciado pelo gênero feminino, tabagismo, tempo de uso do BIA e PaO2/FiO2 no POI. O tempo de internação na UTI foi influenciado pelo APACHE II e tempo de uso do BIA. A mortalidade foi influenciada pelo APACHE II seguido do insucesso na extubação, e este último, quando analisado como desfecho não obteve influência das variáveis estudadas / Abstract: Introduction: Pulmonary dysfunction is common in the postoperative period of cardiac surgery with extracorporeal circulation and may contribute to the increased length of mechanical ventilation (MV). Furthermore, perioperative factors such as older age, female gender, low ejection fraction, low cardiac output syndrome, prolonged cardiopulmonary bypass time (CPB) and use of intra-aortic balloon pump (IABP) may delay extubation and contribute to the failure of this procedure. The increased time on mechanical ventilation is associated with increased length of stay in the intensive care unit (ICU) and hospital mortality. Objective: The aim of this study was to evaluate the respiratory function and perioperative factors associated with prolonged mechanical ventilation, ICU stay, extubation failure and mortality in patients undergoing elective coronary artery bypass grafting with or without reconstruction of the left ventricle that used BIA in intraoperative and postoperative. Methods: Observational study analyzed respiratory, surgical and clinical demographic that later were related to the following outcomes: duration of mechanical ventilation, length of stay in the Intensive Care Unit, extubation failure and mortality. Results: We evaluated 39 patients with mean age 61.2 years and 25 of 39 (64.1%) were male. Pulmonary dysfunction this gift from immediate postoperative until the third postoperative characterized by mild ARDS. The mean duration of MV was 94.4 hours and was influenced by the time of use of BIA and PaO2/FiO2 in the IPO, in univariate and multivariate analysis added the female gender and smoking. The mean ICU stay was 15.1 days and the variables that most influenced this outcome were APACHE II and time of use of BIA in univariate and multivariate analyzes. The failure of extubation occurred in 18 (46.15%) of 39 patients and none of the variables had influence on this event. The death occurred in 19 (48.75%) of 39 patients and showed a strong influence of the APACHE II followed extubation failure. Conclusion: Pulmonary dysfunction was present in the immediate postoperative period until the third postoperative. The MV time was influenced by the female, smoking, time of use of BIA and PaO2/FiO2 in POI. The length of ICU stay was influenced by APACHE II and age of the BIA. Mortality was influenced by APACHE II followed the failure of extubation, and the latter, when analyzed as an outcome not achieved influence of the parameters / Mestrado / Fisiopatologia Cirúrgica / Mestra em Ciências

Mechanical ventilation in itself can harm the lung and cause ventilator-induced lung injury (VILI), which can induce or aggravate acute respiratory distress syndrome (ARDS). Much debate remains over pivotal concepts regarding the pathophysiology of VILI, especially about the precise contribution, kinetics, and primary role of potential VILI mechanisms. Consequently, it remains largely unknown how best to design a well-timed and full-bodied mechanical ventilation strategy. Little is known also about small airways dysfunction in ARDS. Dynamic positron emission tomography (PET) with [18F]fluoro-2-deoxy-D-glucose (18F-FDG) can be used to image cellular metabolism, which during lung inflammation mainly reflects neutrophil activity, allowing the study of regional lung inflammation in vivo. We studied the regional evolution of inflammation using dynamic PET/CT imaging of 18F-FDG in VILI and during different lung-protective mechanical ventilation strategies. By dynamic CT we investigated also the location and magnitude of peripheral airway closure and alveolar collapse under high and low distending pressures and high and low inspiratory oxygen fraction. Piglets were submitted to an experimental model of early ARDS combining repeated lung lavages and injurious mechanical ventilation. The animals were subsequently studied during sustained VILI, or submitted to distinct approaches of lung-protective mechanical ventilation: the one recommended by the ARDS Network (ARDSNet), or to one defined as open lung approach (OLA). The normally and poorly aerated regions - corresponding to intermediate gravitational zones - were the primary targets of the inflammatory process accompanying early VILI, which may be attributed to the small volume of the aerated lung that receives most of ventilation. The ARDSNet strategy did not attenuate global pulmonary inflammation during 27h and led to a concentration of inflammatory activity in the upper and poorly aerated lung regions. The OLA, in comparison with the ARDSNet approach, resulted in sustained and better gas exchange and lung mechanics. Moreover, the OLA strategy resulted in less global and regional inflammation. Dynamic CT data suggested that a significant amount of airway closure and related reabsorption atelectasis occurs in acute lung injury. Whether potential distal bronchioles injury (“bronchiolotrauma”) is a critical and decisive element in ventilator-associated lung injury is a matter for future studies.

Dans le secteur de la santé et particulièrement en unité des soins intensifs, diverses situations cliniques sont rencontrées et l'interprétation d'une grande quantité de données, y compris celles fournies par les équipements tels que moniteurs et ventilateurs, est exigée pour une prise de décision appropriée. La disparité entre cette quantité importante d'information et la capacité humaine limitée crée une variabilité inutile à la décision clinique. Pour faire face au problème, les experts médicaux ont défini des stratégies en vue de promouvoir une pratique fondée sur les données probantes. Cette méthode est devenue un standard pour la pratique clinique et a montré beaucoup d'avantages en menant à la définition de directives spécifiques ou des protocoles précis à appliquer dans certaines situations. Cependant, l'utilisation de directives/protocoles, particulièrement dans les soins intensifs, exige une participation continue des professionnels au chevet du malade et est ainsi difficile à appliquer en pratique clinique. La définition d'assistants informatisés est une solution technologique intéressante à explorer pour faciliter l'introduction des protocoles dans la routine clinique. En ventilation mécanique, on assiste à une prise de conscience croissante sur le potentiel de l'informatisation et son applicabilité au-delà de la recherche et plus concrètement dans le soutien du clinicien dans sa prise de décision quotidienne. Ceci à travers la prise en charge des tâches répétitives et la proposition de suggestions. Ce domaine constitue un environnement idéal pour de telles applications surtout que les ventilateurs de réanimation son aujourd'hui des équipements électroniques sophistiqués qui peuvent embarquer des protocoles informatisés. L'objectif de cette thèse était d'explorer les aspects de développement, déploiement et d'efficacité des « contrôleurs intelligents » en ventilation mécanique afin d'accélérer leur création et leur adoption. Pour examiner les phases de développement et de déploiement, nous nous sommes concentrés sur l'utilisation et l'extension du SmartCare®, une plateforme logicielle qui facilite l'automatisation des procédures thérapeutiques en ventilation mécanique à partir de la modélisation des connaissances expertes jusqu'à leur exécution en temps réel dans un équipement médical. A travers une approche ascendante, en se basant particulièrement sur notre expérience pratique dans le design de contrôleurs intelligents et après l'examen de divers contrôleurs existants, l'objectif était de définir un catalogue de pièces maitresses pour la représentation des protocoles en ventilation mécanique. L'utilisation d'une ontologie du domaine assure une formalisation saine de ces pièces.Sur base de cette approche, nous avons développé un contrôleur pour l'oxygénation testé au chevet du malade. Nous rapportons ses performances comparées à la pratique standard / In healthcare, especially in critical care, various clinical situations are encountered and a huge amount of data, including those provided by equipment such as monitors and ventilators, are required for an appropriate decision-making. The mismatch between this vast amount of information and the human capability creates unnecessary variability in clinical decision. To cope with this problem, medical experts have defined specific strategy called evidence based medicine. This method has become the standard of practice and showed many benefits by leading to the definition of specific guidelines or precise protocols to follow in specific situations. However, the use of guidelines/protocols, especially in critical care, requires the continuous involvement of professionals at the patient's bedside strongly limiting their application in practice. The introduction of computerized assistants for implementing such guidelines/protocols may be an interesting technological solution. In mechanical ventilation where various protocols are available there is a growing acceptance that such computerization might be useful beyond research, in assisting clinicians in their daily decision making by taking over some routine tasks or providing suggestions. Moreover, this domain constitutes an ideal environment because mechanical ventilators are presently powerful electronic equipments in which computerized protocols can be efficiently embedded. The objective of this thesis was to explore several aspects of the development, deployment, and effectiveness of computerized protocols or smart controllers in mechanical ventilation in order to accelerate their creation and adoption. For this purpose, we focused on the use and the extension of SmartCare®, a computer framework for the automation of respiratory therapy starting from clinical knowledge modelling to execution in real time of specific routines embedded into medical products [1]. Through a reengineering approach, from practical experience in smart controller design and investigation of existing controllers, the objective was to define a catalogue of building blocks to facilitate the creation of new controllers. The modeling of such blocks using dedicated domain ontology ensures a sound formalization. To prove the effectiveness of such a generic approach, we built a smart controller for oxygenation tested on the patient's bedside. We reported its performance compared to standard therapy

Introdução: As complicações decorrentes da permanência prolongada na ventilação mecânica invasiva (VMI) contribuem negativamente na funcionalidade do paciente crítico. A intervenção fisioterapêutica busca diminuir este impacto negativo, promovendo a recuperação e preservação funcional. Geralmente suas condutas são baseadas em julgamentos clínicos, estilos individualizados e sem padronização, gerando questionamentos sobre o real impacto da sua inserção no manejo destes pacientes. Objetivos: Avaliar a eficácia da intervenção fisioterapêutica no centro de terapia intensiva (CTI) em pacientes críticos que foram submetidos a um protocolo de extubação da VMI e também a efetividade da fisioterapia nos seguintes itens: percentual de sucesso no protocolo de extubação, tempo de permanência na VMI, permanência no CTI, tempo de internação hospitalar e taxa de mortalidade; através da comparação entre os grupos (com e sem intervenção fisioterapêutica). Material e Métodos: Foram incluídos neste trabalho pacientes que necessitaram de VMI por um período maior que 48 horas e que foram considerados aptos para extubação pela equipe médica assistente. Foram excluídos pacientes que não fossem extubados em até 6 horas após ventilação espontânea em tubo T, paciente com traqueostomia e com doença neuromuscular periférica. Após, o paciente foi colocado em ventilação espontânea com tubo T, e em seguida foi registrado o índice de respiração rápida e superficial (IRRS) através da relação freqüência respiratória/volume corrente, sendo este calculado no 1º (IRRS 1) e 30o (IRRS 2) minuto do teste. Os dados foram expressos em freqüência e percentual, média e desvio padrão e mediana (percentil 25-percentil 75), a variável sucesso foi corrigida por análise de covariância (ANCOVA), com nível de significância p<0,05. Resultados: Foram incluídos 265 pacientes neste estudo, divididos em dois grupos: grupo 1 (sem intervenção fisioterapêutica) possuindo 149 pacientes e o grupo 2 (com intervenção fisioterapêutica) possuindo 116 pacientes. Na comparação entre o grupo 1 e 2 encontramos os seguintes resultados: média de idade 58,3 versus 57,7 (p = 0,79), média de APACHE II (Acute Physiology Chronic Health Evaluation) 18,9 versus 22,3 (p=0,003), sucesso de extubação 80,5% versus 88,8% (p=0,05), IRRS 1 58,2 versus 50,5 (p=0,11), IRRS 2 56,0 versus 45,0 (p=0,01), dias de intubação 7,0 versus 7,0 (p=0,34), dias de internação no CTI 13,0 versus 10,0 (p<0,05), dias de internação hospitalar 33,0 versus 35,0 (p=0,25), óbito 21 versus 25 (p=0,13). Conclusão: O grupo com intervenção fisioterapêutica demonstrou um aumento no sucesso da extubação orotraqueal e diminuição nos dias de internação no CTI. Também apresentou maior tempo de internação hospitalar e taxa de mortalidade, podendo ser justificado pela maior gravidade demonstrada no grupo pelo APACHE II. / Introduction: Complications arising from prolonged invasive mechanical ventilation (IMV) contribute negatively to the functionality of the critically ill patient. The physiotherapy intervention seeks to reduce this negative impact, promoting the recovery and functional preservation of the patient. Generally the physiotherapist’s conducts are based on clinical trials and individualized styles without standardization, raising questions about the real impact of their insertion in the management of these patients. Objectives: To evaluate the efficacy of physical therapy intervention in the intensive care unit (ICU) in critically ill patients who were submitted to a protocol of extubation from IMV and also the effectiveness of physiotherapy in the following items: percentage of success in the extubation protocol implementation, length of stay at IMV, length of stay in ICU, length of hospital stay and mortality rate; by comparing the groups (with and without physical therapy intervention). Material e Methods: This study enrolled patients who required IMV for a period longer than 48 hours and who were considered suitable for extubation by medical assistant staff. We excluded patients who were not extubated within 6 hours after spontaneous breathing in T-tube, tracheostomy and patients with peripheral neuromuscular disease. After, the patient was placed on spontaneous ventilation with T-tube and then it was recorded the rapid shallow breathing index (RSBI) using the ratio of respiratory rate / tidal volume, which is calculated on the 1st (RSBI 1) and 30th (RSBI 2) minutes of the test. The data were expressed as frequency and percentage, mean and standard deviation and median (25th percentile – 75th percentile), the variable ‘success’ was adjusted by analysis of covariance (ANCOVA), with significance level p < 0.05. Results: 265 patients were included in this study, divided into two groups: group 1 (no physiotherapy intervention) with 149 patients and group 2 (physical therapy) with 116 patients. In the comparison between groups 1 and 2, we found the following results: mean age 58.3 versus 57.7 (p = 0.79), mean APACHE II (Acute Physiology Chronic Health Evaluation) 18.9 versus 22.3 (p = 0.003) , successful extubation 80.5 % versus 88.8 % (p = 0.05) , RSBI 1 58.2 versus 50.5 (p = 0.11) , RSBI 2 56.0 versus 45, 0 (p = 0.01) , days of intubation 7.0 versus 7.0 (p = 0.34) , days of ICU stay 13.0 versus 10.0 (p < 0.05) , days of hospitalization 33.0 versus 35.0 (p = 0.25) , deaths 21 versus 25 (p = 0.13). Conclusion: The group with physiotherapy intervention showed an increased success in performing orotracheal extubation and a decrease in ICU stay. Also, it resulted in longer hospital stay and higher mortality rate, which can be explained by the greater severity demonstrated in the group by APACHE II.

Orientadores: Sebastião Araujo / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Ciencias Medicas / Made available in DSpace on 2018-08-08T00:31:25Z (GMT). No. of bitstreams: 1 Monteiro_LudmilaSoccio_M.pdf: 1802463 bytes, checksum: 2ba5bfd3d0b955709113de784abbcd7c (MD5) Previous issue date: 2006 / Resumo: Antecedentes. A aferição da pressão inspiratória máxima (PImax) é um método efetivo para avaliação da força muscular inspiratória, usada também como método diagnóstico e como índice preditivo de desmame da ventilação mecânica. Porém, não existe consenso na literatura sobre o tempo de oclusão de vias aéreas necessário para se obter uma PImax verdadeira durante o desmame da ventilação mecânica. Objetivos. Comparar dois métodos de mensuração da PImax e avaliar se o nível de consciência interfere nos valores obtidos. Métodos. Vinte e oito pacientes de ambos os sexos, hemodinamicamente estáveis, sem sedação, com suporte ventilatório mecânico por tempo = 48 horas, com parâmetros mínimos de desmame da ventilação, foram divididos em dois grupos: pacientes com pontuação na escala de coma de Glasgow (ECGL) = 15 e ECGL < 15. A aferição foi dividida em duas fases e, em cada fase, foram realizadas três mensurações com um intervalo de um minuto entre elas, obtendo-se assim a média entre as três: a via aérea foi ocluída com uma válvula unidirecional por 20 segundos (PImaxT20), ou, por um tempo máximo de um minuto, se um platô de pressão inspiratória não fosse observado durante três inspirações consecutivas (PImaxTid). Após um descanso de 15 minutos, foram realizadas novamente as mensurações na ordem previamente estabelecida (aleatória). Resultados. A média das medidas da PImaxTid (55,8 ± 25,0 cmH2O), no grupo total (n = 28), foi maior que a média das medidas da PImaxT20 (43,1 ± 15,5 cmH2O), com p = 0,002, e o tempo médio para a obtenção da PImaxTid foi de 30,2 ± 11 segundos. Quando divididos em dois grupos, ECGL = 15 (n = 14) e ECGL < 15 (n = 14), esse tempo médio foi de 23,8 ± 7,7 e 36,7 ± 10,0 segundos, respectivamente (p = 0,0019). Conclusões. A PImaxTid, neste grupo heterogêneo de pacientes em desmame da ventilação mecânica, mostrou valores superiores àqueles da PImaxT20, especialmente naqueles com algum grau de comprometimento do estado de consciência (ECGL < 15), sugerindo que necessitem de um tempo maior de oclusão da válvula unidirecional para se atingir a PImax real. Assim, o método comumente utilizado de 20s parece ser insuficiente para se mensurar a verdadeira PImax em pacientes com ECGL < 15. Novos estudos são necessários, agora num grupo mais homogêneo de pacientes (exemplo: com comprometimento neurológico estrutural), para determinar se realmente há necessidade de um tempo de oclusão maior que 20 segundos, ou se os valores obtidos no presente estudo simplesmente representam uma supervalorização desta PImax / Abstract: Background. Maximum inspiratory pressure (PImax) is an effective parameter for the evaluation of inspiratory muscular force and an useful predictive index during weaning from mechanical ventilation (MV). However, there is no consensus in the literature concerning the time of airway occlusion necessary to get a true PImax during weaning from MV. Objectives. To compare two methods of PImax measurement and to evaluate the influence of patients¿ level of conscience (LOC) on their values. Methods. Twenty eight patients of both sexes, hemodynamically stable, without sedation, with MV support for a time = 48 hours and in a weaning process, were divided into two groups: patients with Glasgow coma scale score (GCS) = 15 and GCS < 15. PImax measurement was done in two phases and, in each phase, three measures, with an interval of one minute between them, had been carried through, getting thus the average between the three ones: the airway was occluded with an unidirectional valve for 20 seconds (PImaxT20), or, for a maximum time of one minute, if a plateau of inspiratory pressure was not observed during three consecutive inspirations (PImaxTid). After a rest of 15 minutes, PImax measurement had been carried through again in an order previously randomized. Results. The average of measures of the PImaxTid (55.8 ± 25.0 cmH2O), in the total group (n = 28), was greater that the average of the measures of the PImaxT20 (43.1 ± 15.5 cmH2O), with p = 0.002, and the average time for the attainment of the PImaxTid was of 30.2 ± 11 seconds. When divided in two groups, GCS = 15 (n = 14) and GCS < 15 (n = 14), the average times were of 23.8 ± 7.7 and 36.7 ± 10.0 seconds, respectively (p = 0.0019). Conclusions. PImaxTid, in this heterogeneous group of patients in MV weaning, has shown greater values than those of PImaxT20 especially in those with some degree of the state of LOC alteration (GCS < 15), suggesting that the formers need a longer time of airway occlusion with the unidirectional valve to reach the real PImax. Thus, the method commonly used of 20 seconds seems to be insufficient to measure the true PImax in patients with GCS <15. Further studies, now in a more homogeneous group of neurological patients (example: with structural neurological injury), are needed to verify if these patient are really dependent of a longer airway occlusion time to reach their real PImax, or if the values that have been found in the present study simply represent an overestimation of this variable / Mestrado / Pesquisa Experimental / Doutor em Cirurgia

Historiquement, dans les essais randomisés de réanimation, le critère de jugement privilégié était la mortalité à 28 jours. Cependant, la difficulté à montrer une différence inter-groupes a conduit à utiliser des critères en rapport avec la ventilation mécanique invasive connue pour sa morbidité. La durée de ventilation a tout d’abord été retenue. Mais un taux de décès élevé peut conduire à observer une durée de ventilation faible, et faussement conclure à une efficacité. Le critère « ventilator-free days, VFDs » a été proposé pour pallier cette difficulté. Il correspond au nombre de jours vivants sans ventilation. Mais ce critère pose également des difficultés d’interprétation. Les objectifs de ce travail étaient d’identifier les éléments permettant de bien définir les critères relatifs à l’exposition à la ventilation, et de discuter leur interprétation et analyse statistique.Dans le premier travail, à l’aide d’une revue systématique, nous avons montré qu’il existe différentes définitions et avons explicité les différents items à spécifier. Dans le deuxième travail, nous avons construit une courbe iso-VFDs qui illustre que pour une même valeur de VFDs de multiples interprétations sont possibles. Puis nous avons montré à l’aide d’une base de données fictive que les analyses statistiques classiques ne sont pas adaptées pour comparer l’exposition à la ventilation entre deux groupes et qu’il est nécessaire de recourir à des analyses statistiques prenant en compte les risques compétitifs entre extubation et décès. / The primary outcome of randomized controlled trials in intensive care was usually “mortality at day 28”. However, with reduction of mortality in intensive care units, applying an effective intervention to reduce mortality even more is difficult. Therefore, outcomes related to exposure to mechanical ventilation are used. “Mechanical ventilation duration”(MVD) was first used but raises problems when the mortality is high: the intervention might be considered effective (i.e., reduction of MVD) when actually this reduction is due to increased mortality. “Ventilator-free days” (VFDs) combines mortality and MVD. However,interpreting VFDs is challenging. This thesis collected the different outcomes definitions related to mechanical ventilation used in randomized controlled trials and analyzed the different interpretations of the VFDs outcome and the different approaches for their statistical analysis. We performed a systematic review of articles published over 10 years and found all definitions for outcomes related to mechanical ventilation and identified the items that needed to be specified to define MVD and VFDs. Then we built an iso-VFDs curve, which illustrated that a VFDs value corresponded to very different combinations in terms of mortality and MVD. We showed that parametric (Student t test) and non-parametric (Wilcoxon test) statistical analyses are not adapted to compare mechanical ventilation exposure because mortality competes with extubation. Competitive risk analysis is a more suitable approach and is illustrated.

Master thesis solves the level of CO2 concentration in the premises of universities in Brno. The main objectives of the processed data measured from two monitored rooms, compare it with the permissible limits of concentration, evaluate the effectiveness of natural ventilation and develop a more efficient way to exchange air with forced venti-lation. Space solutions are part of the Philosophical Faculty of Masaryk University, the fourth above-ground floors of buildings A and B1. The theoretical part deals with CO2 concentrations, measurement methods, the influence of CO2 on the organism and the assessment of daylight.

Humans are increasingly influencing the climate and the temperature of the Earth by burning fossilfuels, destroying forests, and raising livestock. This adds massive amounts of greenhouse gases(GHG) to those already present in the atmosphere, amplifying the greenhouse effect andcontributing to global warming. The building sector accounts for a significant amount ofgreenhouse gas emissions. Decarbonizing the building industry can result in significant emissionreductions in the future years. Sweden's energy and climate goals have been updated, and some ofthem include reducing GHG emissions in the building sector, increasing energy efficiency, andmaking electricity production 100 percent renewable. In Sweden, energy renovations in singlefamily houses (SFHs) have the potential to reduce GHG emissions and improve energy efficiency,but the rate of energy renovations remains low because of financial, social, and behavioral barriers.This thesis aims to use LCA and LCC methodologies to assess energy renovations on SFH inVäxjö by combining various combinations of energy efficiency measures (EEMs) to reduce energyuse. The energy performance and eight different renovation scenarios using different EEMs havebeen evaluated for the selected single-family building. To evaluate building renovation measures,we developed a method based on life cycle assessment (LCA) and life cycle cost (LCC) thatincorporates building information modeling (BIM). Five different renovation measures werecombined in eight scenarios in this research, including different thicknesses of thermal insulationfor walls and roofs, triple-glazed windows, and doors with different U-values, air-source heatpumps, mechanical ventilation with heat recovery, and solar photovoltaic. The present cost valuesof renovation measures over 50 years for LCC calculation were calculated. The global warmingpotential (GWP) of each renovation measure was estimated over 50 years using One-click LCA.According to the findings of this thesis project, scenarios 1 and 8 had the lowest and highestreductions in primary energy number, respectively. Scenarios 5, 6, 7, and 8 are the most costeffective in comparison to other scenarios. All scenarios resulted in a reduction in GWP impactfrom an LCA perspective in which scenario 7 resulted in the highest reduction in GWP impact.

Mechanical ventilators are devices in critical care to assist breathing in case of expiratory dysfunction. The expiratory valve is a critical component to the ventilator as it controls the pressure in the patient’s lungs. The design process of a new expiratory valve assembly is a time consuming one due to the wide range of possible design solutions both the voice-coil actuators and membrane valves typically used in ventilators. This thesis evaluates the possibility of creating and using analytical models for model based development to speed up the early design phases of a expiratory valve assembly. The main components, voice-coil actuator and membrane valve are modelled separately and experimentally verified. A complete expiratory system model and hardware-in-the-loop test setup are constructed in order to explore how well can the dynamic properties and control performance of valve assembly be predicted. Finally various questions in the valve assembly design are explored and a new design is proposed to demonstrate the capabilities of the model based approach. The resulting voice-coil and membrane valve models can be considered accurate enough for fast exploration of the design space, as an error rate below 10% is reached without manual tuning for each design. / Mekaniska ventilatorer är en utrustning inom intensivvården för assisterad andning för patienter med nedsatt andningsförmåga. Utandningsventilen är en kritisk komponent till ventilatorn då den kontrollerar lungtrycket hos patienten. Design processen för en ny utandningsventil är en tidskrävande process mycket på grund av den mängd olika design möjligheter som kan utforskas för både talspole aktuatorn samt membran ventilen som oftast används i ventilatorerna. I detta examensarbete utforskades möjligheterna till att skapa och använda analytiska modeller för modellbaserad utveckling för att accelerera de tidiga design stadierna för en utandningsventil. Huvudkomponenterna, talspole aktuatorn och membran ventilen är modellerade separat och experimentellt verifierade. En fullständig modell för hela utandningssystemet samt en hardware-in-the-loop test plattform är konstruerad för att utforska hur väl de dynamiska egenskaperna samt kontroll prestandan för en utandningsventil kan prediceras. Slutligen utforskas diverse frågor angående ventil designen och en ny design föreslås för att demonstrera möjligheterna med en modellbaserad metod. Den slutliga modellen för både talspole aktuatorn och membran ventilen kan betraktas som tillräcklig precisa för snabb utforskning inom de olika design möjligheterna, då en felprocent under 10% är uppnådd utan manuell finjustering för varje design.

Bakgrund Medicinska gaser är kalla och torra, därav behövs de befuktas och värmas för att inte åsamka skador på lungorna hos patienter som behandlas i respirator. De vanligaste metoderna är aktiv och passiv befuktning, så kallad heated humidification (HH) och heat and moisture exchanger (HME filter). Syfte Att sammanfatta befintlig forskning om för- och nackdelar samt skillnader som framkommit med aktiv respektive passiv befuktning i respirationsvård på intensivvårdsavdelning. Metod En systematiskt genomförd litteraturstudie med narrativ summering. Sökningar gjordes i databaserna CINAHL, PubMed samt Cochrane. Nio vetenskapliga artiklar med kvantitativ ansats mellan tidsintervallet 2012–2022 inkluderades utifrån PICO. Kvalitetsgranskning utfördes med validerade granskningsmallar från Joanna Briggs Institute. Huvudresultat HH tillförde mindre mekaniskt dead space för intuberade som gav bättre PaCO2 värden, vilket är specifikt fördelaktigt för patienter med acidos. Den metoden är dock mer kostsam och fungerar ej lika effektivt vid stigande rumstemperatur och direkt solljus på apparaturen. Den kräver därav mer kontroller samt tillsyn vid dessa förhållanden. Vid non-invasiv behandling och tracheostomi i respirator ger HME filter inte sämre PaCO2 värden eftersom det större mekaniska dead space den tillför inte har samma negativa effekt vid dessa behandlingar och tillstånd. Den inkrementella kostnaden är bättre för HME filter, men huruvida den ger upphov till fler incidenser av tubocklusion är ej klarlagt. Slutsats Båda befuktningsmetoderna har klara fördelar och nackdelar, därav är det fördelaktigt att ha tillgång till båda metoderna på intensivvårdsavdelningar tillsammans med en tydlig rutin om när metoderna skall användas till patienten. / Background Medical gases are cold and dry, therefore the need for adding humid and heat is highly important, otherwise they can cause damage at the lungs in patients undergoing mechanical ventilation. The most common methods are active and passive humidification so called heated humidification (HH) and heat and moisture exchanger (HME). Aim Summarize existing research on advantages, drawbacks and differences that have emerged with active and passive humidification in respiratory care in the intensive care unit. Method A systematic conducted literature review with a narrative summary to compile the results. Searches were made on the databases CINAHL, PubMed and Cochrane. Nine scientific articles with a quantitative approach between 2012-2022 were included based on PICO. Quality review was performed with validated review templates from Joanna Briggs Institute. Results HH provided less mechanical dead space for intubated patients which provided better PaCO2 values, specifically beneficial for patients with acidosis. However, this method is more expensive and does not work as effectively with increasing room temperature and direct sunlight on the equipment. It therefore requires more controls and supervision in presence of these conditions. In patients undergoing non-invasive mechanical ventilation and in patients with tracheostomy who are mechanically ventilated, HME filters do not give higher PaCO2 values. ​​The increased mechanical dead space it adds does not have the same negative effect in these treatments and conditions. The incremental cost is better for HME filters, but whether it gives rise to more incidences of tube occlusion is not clear. Conclusion Both humidification methods have clear advantages and drawbacks, hence it is advantageous to have access to both methods at intensive care units together with a clear routine about when the methods should be used.