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Detection and filtering of ECG signals
Princ, Martin ; Kozumplík, Jiří (referee) ; Provazník, Ivo (advisor)
The aim of this thesis is to provide insight into certain elementary methods/ways of electrocardiographical signals filtration. Also, the thesis aims to introduce different techniques of detecting the EKG signal waves. The first part of the work analyses the theory of heart, electrical processes in heart, and the EKG signals systems. Further, the elementary methods of filtration and QRS detection are introduced.In the second part, the thesis analyses the BIOPAC student Lab system and presents simple methods of measuring the static EKG. The measure data results are then processed using the MATLAB program, and they are further used to demonstrate and practice the elementary methods of EKG filtration and QRS complex detection. Operation detectors QRS test on database EKG signal.
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Measurement of cardiovascular parameters
Szpyrc, Bogdan ; Rychtárik, Milan (referee) ; Kolářová, Jana (advisor)
This bachelor thesis deals with the questions of anatomy and physiology of the heart. The diagnostic system BIOPAC is used in order to measure the electrical activity of the heart by a 12-lead electrocardiogram (ECG) and to evaluate the heart rate. The ECG signal is transformed into a vectorcardiogram (VCG) from which the direction of the electrical axis of the heart is deducted. Own experiment will be suggested in order to detect a load reaction and cessation of breath on the heart rate and a load reaction on an inclination of the electrical axis of the heart. A programme application will be designed so as to simplify the analysis of values. The application will allow reconstruction of the ECG signal into a VCG scheme and an automatic calculation of the heart rate and the inclination of the electrical axis of the heart. By means of a statistical analysis the results of measurements will be evaluated.
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The heartbeat counter
Malínský, Zdeněk ; Dlouhý, Jiří (referee) ; Švrček, Martin (advisor)
Heart rate variability belongs to basic and most frequently interpretation of physiologic statement in medicine. The pulse rate serves as an indicator of the heart activity. The subject of this diploma thesis is projection of the heartbeat counter. The work describes electrocardiograph and separated waves, ways of calculation heart rate, characteristics mechanism for measuring and other necessary information about heart rate measuring. This master thesis fixates on heart rate-calculation from including R-R intervals. Here is described whole project of heartbeat counter, properties of separated blocks and calculation of useful parameters. Further there is noted software resolution for the microcontroller and program for the calculation of heart rate frequency including unwinding signal preprocessing and detection of separated QRS complexes. The products of this diploma thesis are the circuit including the board circuit and codes of separated programs.
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Filtering of the ECG Signals
Slezák, Roman ; Kolář, Radim (referee) ; Kozumplík, Jiří (advisor)
Main objective of this thesis was to learn about possibility of suppression of narrow band disturbances. We focused on use of Lynn’s filters. The objective was to realize these filters with respect to a fast algorithm of filtering. Concretely, for suppression of drift we realized the fast high pass filter with flexible cut off frequency. Then we realized filter for suppression of electrical network disturbance. We have realized these filters for sampling frequencies 250 and 500 Hz and we tested them with real ECG signals. Then we have evaluated their efficiency.
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ECG generator for equipment testing
Čech, Petr ; Rampl, Ivan (referee) ; Chmelař, Milan (advisor)
This diploma thesis is focused on testing ECG monitors and ECG instruments. There are discussed origin and charakteristics of ECG signal. The ECG signal is presented by standard leads. This is the reason, why the way of making leads is mentioned. One chapter is aimed at generating ECG signal. There are set requierements for the ECG generator. These requierements results from ECG instrument possibilities and from ECG signal character. Next part of this diploma thesis includes hardware design of each part of the system. The system was designed with respect to mobility and 12-leads systems compatibility. Finaly the thesis includes design of the controll software.
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Application of neural networks for classification of T-wave alternations
Procházka, Tomáš ; Harabiš, Vratislav (referee) ; Hrubeš, Jan (advisor)
This thesis deals with analysis of T-wave Alternans (TWA), periodical changes of T wave in ECG signal. Presence of these alternans may predict higher risk of sudden cardiac death. From the several possible ways of TWA classification, the training algorithms of self organizing maps are used in this thesis. Result of the thesis is a program, which in the first step detects QRS complexes in the signal. Then, in the next step, gained reference points are used for T-waves detection. Detected waves are represented by a vector of significant points, which is used as an input for artificial neural network. Final output of the program is a decision about presence of TWA in the signal and its rate.
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Use of neural networks in classification of heart diseases
Skřížala, Martin ; Tannenberg, Milan (referee) ; Hrubeš, Jan (advisor)
This thesis discusses the design and the utilization of the artificial neural networks as ECG classifiers and the detectors of heart diseases in ECG signal especially myocardial ischaemia. The changes of ST-T complexes are the important indicator of ischaemia in ECG signal. Different types of ischaemia are expressed particularly by depression or elevation of ST segments and changes of T wave. The first part of this thesis is orientated towards the theoretical knowledges and describes changes in the ECG signal rising close to different types of ischaemia. The second part deals with to the ECG signal pre-processing for the classification by neural network, filtration, QRS detection, ST-T detection, principal component analysis. In the last part there is described design of detector of myocardial ischaemia based on artificial neural networks with utilisation of two types of neural networks back – propagation and self-organizing map and the results of used algorithms. The appendix contains detailed description of each neural networks, description of the programme for classification of ECG signals by ANN and description of functions of programme. The programme was developed in Matlab R2007b.
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Analysis of T wave alternations in programming language C - Radek Poul
Poul, Radek ; Vítek, Martin (referee) ; Rychtárik, Milan (advisor)
The thesis deals with detection of T-wave alternans. The presence of T-wave in surface ECG is recognized as a marker of electrical instability of heart in stage his repolarization, arise increased risk of emergence ventricular fibrillation and sudden cardiac death. The goal of our project is familiarize with methods of detection T-wave alternans. In particular spectral method and spectral method which was realized in variant for running reading values in time (“sliding window”). To suggest a QRS complex detector, localize the T-wave and to make TWA detection using spectral method and modified spectral method. This project is to be made in C language in appropriate user interface.
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Monitoring of blood pressure and heart activity via ECG in prehospital urgent care
VRÁNOVÁ, Anna
The topic of this thesis is monitoring of blood pressure and heart activity via ECG in prehospital emergency care. So the thesis deals with a necessary part of a patient´s examination that precedes effective treatment. In the theoretical part the prehospital emergency care is defined and the emergency medical service, which provides this care, is characterized. Anatomy and physiology of heart is outlined there. Also blood pressure and its measurement is discussed there. Electrocardiography is described and information needed to basic orientation in ECG recording is introduced. The practical part was carried out using mixed methods research. The first method was a quantitative research in the form of a standardized anonymous questionnaire. Employees of the Emergency Medical Service of the South Bohemia Region who work as paramedics became the respondents of this questionnaire. The qualitative research strategy consisted in observation of paramedics when they were monitoring blood pressure and heart activity via ECG in the prehospital emergency care. The aims of the research part were these: mapping of states and situations that lead paramedics to monitor patient´s blood pressure and heart activity, description of different methods of blood pressure and heart activity monitoring and finding the paramedics´ experience with available apparatuses. The last aim was a detailed introduction to monitoring of blood pressure and heart activity via ECG. The results show the following information. Paramedics measure every or nearly every patient´s blood preasure. They begin to monitor heart activity via ECG when the patient suffers from chest pain, is unconcsious, when there is a risk of arrhythmias or when the patient is circulatory unstable. Auscultatory method mediated via aneroid sphygmomanometer is the most frequent way of blood pressure monitoring in prehospital emergency care. Paramedics are satisfied with apparatuses and tools used to blood pressure and heart activity monitoring. All the acquired knowledge serves to detailed introduction to the issue which a paramedic meets in his or her everyday work and must have full control of it.
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Nursing intervencion with middle age patients suffering from arrhythmia.
KOLÁŘOVÁ, Libuše
Current rapid development medical science is already at such level that its aim is to meet need of patients in maximum possible extend and there are significant achievements in modern medical treatment. It does not promise full recovery, however quality of patients life may improve earlier or acute problems can be eliminated on time thanks to early diagnostics, well chosen treatment or early medical action and last but not least approach of entire attending medical staff and professional attitude of a nurse, who is an essential part of complex care, since he/she is often the first one in contact with patients, can recognize a problem and make sure it will be looked at.
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