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Application of finite element method to real problems in hemodynamics.
Švihlová, Helena ; Hron, Jaroslav (advisor) ; Dolejší, Vít (referee)
The incompressible fluid flow around the geometries of cerebral artery aneurysms is studied in this thesis. The aneurysm is a local extension of a vessel. This disease is dangerous only in the case of rupture. Then the blood is released into the brain. The need of accurate computation of the velocity and pressure fields in this geometries is motivated exactly by the question which aneurysm has tendency to rupture. The finite element method (FEM) is used for the computation of the flow. A good domain discretization is one of the main step in FEM. Modern computed tomography is able to produce series of the two- dimensional images and it is necessary to create an appropriate three-dimensional model of the tissue. This thesis includes the description of the mesh generation and the ways to smooth and improve the meshes. In the theoretical part the equations of fluid flow are formulated. A suitability of a choice of boundary conditions is discussed. Weak formulation for the equations and its discretization are presented. In the practical part velocity and pressure fields are computed by the various finite elements. Wall shear stress which plays an important role in the evolution of an aneurysm is also computed on the introduced meshes. Comparison of mesh smoothing filters, used finite elements and used...
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SMV-2012-22: Data processing in cardiology
Jurák, Pavel ; Halámek, Josef ; Vondra, Vlastimil
Contracted research has been focused on data processing in cardiology. It includes specialized analyzes of large polysomnographic records mainly from long-term sleep studies. Research involves advanced techniques for detection and analysis of heart rate, heart depolarization and repolarization and hemodynamic changes during different sleep stages. Detected numerical parameters were further processed and analyzes by different statistical methods
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Hemodynamic monitoring in the intensive care - preparation of educational materials for newly hired nurses
MELICHAROVÁ, Jaroslava
This diploma thesis focuses on the monitoring of hemodynamics in intensive care units; the main objective was to create an educational material for newly employed nurses. This educational material should facilitate the adaptation process of nurses at Anaesthesiology-Resuscitation Units (AR) or Intensive Care Units (ICU).The diploma thesis is divided in two parts: theoretical and empirical. The topics covered by the theoretical part include the concept of intensive care, the technical equipment, the scope of work of intensive care nurses, anatomy and physiology of the cardiovascular system, cardiovascular system monitoring, hemodynamic monitoring, adaptation of new nurses at the workplace, and the possibilities of educational methods aimed at newly employed nurses. The empirical part was conducted as qualitative inquiry in the form of interview. The interviews were semi-standardised and they were held at the AR unit in the České Budějovice Hospital. The subjects were the nurses from the RES 1 and RES 2 stations. The first part of the research inquiry consisted in interviews with the nurses at the Anaesthesiology-Resuscitation unit. The interviews were not taped, due to the respondents' request. All the answers were carefully recorded and immediately transcribed and processed to prevent any inaccuracy of information. The results were organised in charts according to the categorisations, in a well-arranged manner. The second phase consisted in creating the educational material for the newly employed nurses and the third phase concluded the project by distributing the educational materials at the hospital unit where the interviews were conducted. The nurses could therefore assess whether the educational material meets their requirements and will be useful in practice. The respondents were interviewed again and the results were subsequently also organised in charts.The results of the research inquiry show that the nurses at the Anaesthesiology-Resuscitation Unit in the České Budějovice Hospital perceive the correct hemodynamic monitoring as important, that they know what hemodynamic monitoring is and are aware of the monitoring possibilities. The nurses of this unit perform both invasive and non-invasive monitoring of hemodynamic parameters. The basic task is measuring the central venous pressure and arterial pressure. Other parameters are monitored by the doctors with the application of the Swan-Ganz catheter. The most frequently used monitors are PICCO, Lidco, Vigileo and Vigilance. All interviewed respondents agreed that their only help during the adaptation process was the manufacturers' materials and the advice from the nurse-trainers. A small part of the respondents was trained directly by the company distributing the monitors. The final phase of the research inquiry revealed that the nurses like the new educational material but they are afraid that it will end up collecting dust as the other materials supplied by students. The interviews established that it is easier to directly communicate the necessary information to the new nurses along with practical demonstration than to recommend an educational material for studying of at least the theoretical part.
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Invasive monitoring in intensive care
CUPER, Tomáš
Invasive monitoring is a repetitive, durative observation of physiological functions of a patient and functioning of apparatuses which serve as support of these functions. It is thus an active, repetitive and continuous process when both the patient and the medical apparatuses are regarded. The human factor is thus essential and vital. The reason for application of the invasive monitoring during an intensive hospital care is above all the ability to support physiological functions of a patient, at the same time, it serves to timely detect divergences in physiological values; it very often effectively helps in further decision-making of medical interventions, and clarifies the effectiveness of patient´s treatment. The theoretical part of this bachelor thesis deals with the issue of invasive monitoring in intensive hospital care. The beginning of the thesis provides an explanation what actually the invasive monitoring means, and clarifies and characterises intensive medicine and monitoring in general. The individual types of invasive monitoring are divided according to areas of basic living functions in cardiovascular, respiratory, and central nervous system. With every type of invasive monitoring comes an explanation and clarification of it, further, generally indicated and contraindicated statuses are provided, along with instruments and the way monitoring is applied. The theoretical part is concluded by a chapter that deals with general nursing care. The practical part focuses on mapping of the most often used types of invasive monitoring given critically ill patients in Anaesthesiology and Resuscitation wards, and Urgent Admittance wards in hospitals of the area of South Bohemia, and the region of Carlsbad, and mapping of knowledge of staff of Anaesthesiology and Resuscitation and Urgent Admittance in the particular regions given invasive monitoring. The research was implemented by a quantitative method using a printed standardised questionnaire. The amount of data was collected in March 2014. The target group of the research was a team of general nurses and paramedics, who work in Anaesthesiology and Resuscitation wards and Urgent Admittance wards. The anonymous questionnaire was handed out 100 exemplars for hospitals in South Bohemia, and 100 exemplars for hospitals in the region of Carlsbad. In South Bohemia, there were picked the hospitals in České Budějovice, Jindřichův Hradec, Písek, Prachatice, and Tábor, there. In the region of Carlsbad, there were picked the hospitals in Cheb, Carlsbad, and Sokolov, there, to fill in the questionnaire. There took part 141 respondents in the research. The total amount of responses out of 200 exemplars (100%) of the questionnaire thus reached 70, 5%. The questionnaire contained the total of 28 questions, out of which the opening 4 were stratification-like, question nr. 5 was closed, question nr. 6 were half-open and the remaining 22 questions were dealing with knowledge of respondents in the issue of invasive monitoring in intensive care. The results were progressed by the statistic programme SPSS into well arranged tables, and the set hypotheses were statistically evaluated with help of X2 square test. The goal of this bachelor thesis was to map the most often used types of invasive monitoring with critically ill patients in Anaesthesiology and Resuscitation wards, and Urgent Admittance wards in hospitals of South Bohemia, and in region of Carlsbad. This goal was fulfilled. The next goal was to map knowledge of invasive monitoring given staff of Anaesthesiology and Resuscitation wards, and Urgent Admittance wards in hospitals of South Bohemia, and in region of Carlsbad. This goal was fulfilled too. Statistically evaluated questionnaire proved that the workers have the knowledge in the area of treatment, hemodynamic values, as well as techniques in taking care of critically ill patients in Intensive Care wards.
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Detection of the pulse wave velocity in an elastic tube
Chlup, Hynek ; Macková, H. ; Vilímek, M. ; Žitný, R. ; Konvičková, S.
The velocity of the pulse wave in blood vessels is one of the important hemodynamical parameters to detect health condition or a degree of damage of a diseased artery. To understand the problem, the physiological values must be known. In our laboratory, the velocity of pulsewave in elastic tubes and arteries is measured in vitro by non-invasive method. The method is based on optical measurements of displacement of the pulsating pipe wall. A crash test camera with high frame rate of 1000 Hz (fps) was used.
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