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Analysis of pulse wave propagation in aorta
Tichoň, Dušan ; Klas, Roman (referee) ; Burša, Jiří (advisor)
The aim of this diploma thesis is to assess the applicability of pulse wave propagation monitoring in the cardiovascular system in the field of prediction and early diagnosis of abdominal aortic aneurysm (AAA). The very first part is focused on description of heart and blood vessels with its pathological changes in presence of aneurysm. For this reason, current methods of monitoring and surgical treating of AAA were mentioned. Due to their difficult clinical use widely in the population, new methods based on pulse wave monitoring were presented. Using an analytical approach we estimated the difference in the arrival of the pulse wave at measurable locations between healthy and pathological aorta in the order of miliseconds. By experimental monitoring using photoplethysmographic sensors, we observed significant changes of pulse wave velocity with respect to the mechanical properties of the artery wall (mainly associated with age), which we tried to implement by hyperelastic material models used in computational simulations of pulse wave proagation on simplified geometries by fluid structure interaction method. These analyzes should verify applicability of FSI simulations in further development of diagnostic methods of AAA.
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Breathing Rate Estimation from the Photoplethysmogram
Petrík, Jakub ; Králík, Martin (referee) ; Kozumplík, Jiří (advisor)
The main topic of this bachelor thesis are methods for breathing rate estimations from photopletysmographic signals. In the theoretical part of the thesis we find a biref review of methods that are used for breathing rate estimation. These methods are than tested and their performance is evaluated on two pubilc databases BIDMC and CapnoBase. These databases also contain reference values of respiratory rate.
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Vital Signs Monitoring
Kratochvíl, Pavel ; Mrázek, Vojtěch (referee) ; Vašíček, Zdeněk (advisor)
Cieľom tejto práce je navrhnúť dizajn, implementovať prototyp a evaluovať funkčnosť systému pre monitorovanie životných funkcií. Navrhnuté riešienie je založené na Bluetooth Low Energy Mesh sieti, v ktorej sa nachádzajú zariadenia štyroch typov: batériou napájané nositeľné monitorovacie zariadenie zbierajúce fotopletysmografické dáta zo senzora a rozosielajúce extrahované informácie o frekvencii srdcového tepu a periférneho okysličenia subjektu do mesh siete; zariadenia preposielajúceho dáta v sieti (relay node); nosného zariadenia konfigurujúceho mesh sieť pri jej inicializácii (provisioner node) a koncového zariadenia, ktoré odosiela dáta prijaté v mesh sieti pomocou protokolu MQTT na internet. Batériou napájané monitorovacie zariadenia sú implementované na module nRF52833 od firmy Nordic Semiconductor, zatiaľ čo koncové zariadenia komunikujúce cez MQTT protokol využívajú ESP32 moduly od firmy Espressif. Analýza zozbieraných PPG dát je dosiahnutá dvojitou filtráciou (spredu a zozadu) pomocou Chebyshev II band-pass filtra štvrtého rádu, následovanou vyhladením dát s použitím kĺzavého priemeru a extrakciou indikátorov životných funkcií algoritmom s jediným priechodom v nazbieraných vzorkách. Vďaka výbornej energetickej úspornosti zariadení a minimálnej vyžadovanej infraštruktúre predstavuje navrhnutý systém vhodné riešenie pre zdravotnícke zariadenia s obmedzenými finančnými zdrojmi.
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Analysis of pulse wave propagation in aorta
Tichoň, Dušan ; Klas, Roman (referee) ; Burša, Jiří (advisor)
The aim of this diploma thesis is to assess the applicability of pulse wave propagation monitoring in the cardiovascular system in the field of prediction and early diagnosis of abdominal aortic aneurysm (AAA). The very first part is focused on description of heart and blood vessels with its pathological changes in presence of aneurysm. For this reason, current methods of monitoring and surgical treating of AAA were mentioned. Due to their difficult clinical use widely in the population, new methods based on pulse wave monitoring were presented. Using an analytical approach we estimated the difference in the arrival of the pulse wave at measurable locations between healthy and pathological aorta in the order of miliseconds. By experimental monitoring using photoplethysmographic sensors, we observed significant changes of pulse wave velocity with respect to the mechanical properties of the artery wall (mainly associated with age), which we tried to implement by hyperelastic material models used in computational simulations of pulse wave proagation on simplified geometries by fluid structure interaction method. These analyzes should verify applicability of FSI simulations in further development of diagnostic methods of AAA.
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