Browsing by Author "Zikich, Dragoslav (35084745200)"

We performed continuous synchronized recordings of the blood flow in the brachial artery, electrocardiogram (ECG) and respiration, in different body positions, using a newly developed photoplethysmograph (PPG) sensor. Study of the arterial blood flow was done using a novel mathematical method developed for this purpose. The analyses of 5-minute recording sessions, at constant breathing frequency, showed a high correlation between the arterial blood flow and the heart rate. In addition, the analyses of blood flow recordings from the carotid artery revealed a significant correlation with the heart rate, despite the signal disturbance induced by neck muscle movement during the respiratory circle. Along with arterial blood flow, we performed recordings of peripheral blood flow using an identical PPG sensor. The analyses demonstrate that the arterial blood flow is in better correlation with the heart rate than the peripheral blood flow. © 2010 Taylor & Francis.

We performed continuous synchronized recordings of the blood flow in the brachial artery, electrocardiogram (ECG) and respiration, in different body positions, using a newly developed photoplethysmograph (PPG) sensor. Study of the arterial blood flow was done using a novel mathematical method developed for this purpose. The analyses of 5-minute recording sessions, at constant breathing frequency, showed a high correlation between the arterial blood flow and the heart rate. In addition, the analyses of blood flow recordings from the carotid artery revealed a significant correlation with the heart rate, despite the signal disturbance induced by neck muscle movement during the respiratory circle. Along with arterial blood flow, we performed recordings of peripheral blood flow using an identical PPG sensor. The analyses demonstrate that the arterial blood flow is in better correlation with the heart rate than the peripheral blood flow. © 2010 Taylor & Francis.

The velocity by which the disturbance travels through the medium is the wave velocity. Pulse wave velocity is one of the main parameters in hemodynamics. The study of wave propagation through the fluid-fill elastic tube is of great importance for the proper biophysical understanding of the nature of blood flow through of cardiovascular system. The effect of viscosity on the pulse wave velocity is generally ignored. In this paper we present the results of experimental measurements of pulse wave velocity (PWV) of compression and expansion waves in elastic tube. The solutions with different density and viscosity were used in the experiment. Biophysical model of the circulatory flow is designed to perform measurements. Experimental results show that the PWV of the expansion waves is higher than the compression waves during the same experimental conditions. It was found that the change in viscosity causes a change of PWV for both waves. We found a relationship between PWV, fluid density and viscosity. © 2015 Elsevier Ltd.

The velocity by which the disturbance travels through the medium is the wave velocity. Pulse wave velocity is one of the main parameters in hemodynamics. The study of wave propagation through the fluid-fill elastic tube is of great importance for the proper biophysical understanding of the nature of blood flow through of cardiovascular system. The effect of viscosity on the pulse wave velocity is generally ignored. In this paper we present the results of experimental measurements of pulse wave velocity (PWV) of compression and expansion waves in elastic tube. The solutions with different density and viscosity were used in the experiment. Biophysical model of the circulatory flow is designed to perform measurements. Experimental results show that the PWV of the expansion waves is higher than the compression waves during the same experimental conditions. It was found that the change in viscosity causes a change of PWV for both waves. We found a relationship between PWV, fluid density and viscosity. © 2015 Elsevier Ltd.