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Photoplethysmographic method of the arterial compliance measurement
Nejedlý, Petr ; Chmelař, Milan (referee) ; Svačinová,, Jana (advisor)
The purpose of this study is a description of dynamic photoplethysmography as a method for assessment of viscoelastic properties of small diameter arteries. The first part of this work defines a mathematical model for the description of the arterial wall features and parasitic effects, that might occur during measurement. Furthermore, the experimental part of the work deals with the measurement of arterial wall compliance on healthy volunteers during physiological and induced ischemia conditions. Moreover, the mathematical model and statistical methods are applied for interpretation of experimental data.
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Automatic determination of the pulse wave velocity in a body segment
Kampo, Dávid ; Svačinová, Jana (referee) ; Vondra, Vlastimil (advisor)
This Bachelor´s thesis deals with a propagation of a pulse wave velocity in different body segments and its measurement through bioimpedance. In connection with this topic, the work includes a profound description of a pulse wave and its velocity in regards to diagnostics and prevention of cardiovascular diseases that have been prevailing in recent years. During the process of determination of PWV, ECG is recorded, as it helps to accurately estimate the relevant transition times and the reulting PWV. The main purpose of this work is to validate that PWV can be determined without supportive ECG signals, what as a result makes the whole process simpler, more effective and available. The main target of this work has been successfully achieved and the algorithm for an evaluation of transition times and determination of PWV is described in the work. Moreover, the algorithm is implied to the structure of GUI in Matlab programm where the interface has been designed to suit the user´s needs to analyse PWV. Highlighting the validation process and functionality of the algorithm, signals from 21 subjects have been used to assess some of the most frequent analysed PWVs and all average values of velocities are within a physiological range from 5 m/s to 15 m/s. cfPWV is considered as a golden standard when it comes to PWV and the average value for all 21 subjects has been estimated to 7,54 m/s what corresponds with values from scientific studies that have been assessing cfPWV.
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Automatic determination of the pulse wave velocity in a body segment
Kampo, Dávid ; Svačinová, Jana (referee) ; Vondra, Vlastimil (advisor)
This Bachelor´s thesis deals with a propagation of a pulse wave velocity in different body segments and its measurement through bioimpedance. In connection with this topic, the work includes a profound description of a pulse wave and its velocity in regards to diagnostics and prevention of cardiovascular diseases that have been prevailing in recent years. During the process of determination of PWV, ECG is recorded, as it helps to accurately estimate the relevant transition times and the reulting PWV. The main purpose of this work is to validate that PWV can be determined without supportive ECG signals, what as a result makes the whole process simpler, more effective and available. The main target of this work has been successfully achieved and the algorithm for an evaluation of transition times and determination of PWV is described in the work. Moreover, the algorithm is implied to the structure of GUI in Matlab programm where the interface has been designed to suit the user´s needs to analyse PWV. Highlighting the validation process and functionality of the algorithm, signals from 21 subjects have been used to assess some of the most frequent analysed PWVs and all average values of velocities are within a physiological range from 5 m/s to 15 m/s. cfPWV is considered as a golden standard when it comes to PWV and the average value for all 21 subjects has been estimated to 7,54 m/s what corresponds with values from scientific studies that have been assessing cfPWV.
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Arterialwall Nonlinear Features Identification By Vibrational Photoplethysmography Technique
Nejedlý, Petr
The presented paper describes a mathematical model for estimation of an arterial compliance by vibrational photoplethysmography technique. The first section of the article describes non-linear viscoelastic properties of the arterial wall. Furthermore, the second part of the paper specifies interactions between the arterial segment and measuring cuff. The viscoelastic model was created for the purpose of arterial compliance experimental research and computer simulations of parasitic effects that might occur during measurement.
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Photoplethysmographic method of the arterial compliance measurement
Nejedlý, Petr ; Chmelař, Milan (referee) ; Svačinová,, Jana (advisor)
The purpose of this study is a description of dynamic photoplethysmography as a method for assessment of viscoelastic properties of small diameter arteries. The first part of this work defines a mathematical model for the description of the arterial wall features and parasitic effects, that might occur during measurement. Furthermore, the experimental part of the work deals with the measurement of arterial wall compliance on healthy volunteers during physiological and induced ischemia conditions. Moreover, the mathematical model and statistical methods are applied for interpretation of experimental data.
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