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Current work is a part of long term research, which aim is to study the possibilities to diagnose the atherosclerosis in early stadium by using pulse wave velocity and its waveform analysis. The mobile experimental measurement complex is built and technically tested for the long term study in hospital. Measurement complex consists of ten physiological signal recording channels and reference devices:...
A non-invasive and portable apparatus is designed for the early detection of vascular stiffness in community use. The device is based on embedded system. It collects electrocardiograph (ECG) and plethysmograph (PPG) signals from human body, calculates characteristic parameters that reflect the state of the blood vessel and displays them on LCD real-time. Also, a network communication module is integrated...
Arterial stiffness is an important index for cardiovascular events. The objective of this study is to examine possible parameters related to arterial stiffness that can be estimated during simple arm movements. An experiment was conducted on 32 subjects divided into two groups, one with an age of 26plusmn4 years old, and the other 61plusmn9. The pulse transit time measured from electrocardiogram to...
Pulse transit time (PTT) has been widely used for noninvasive examination of the arterial viscoelastic properties, such as elasticity, compliance, and stiffness of the vessel walls. PTT is usually determined as the time interval between the peak of the electrocardiogram R wave and the foot of the photoplethysmogram (PPG). However, it was observed that the PPG is affected by the applied contact force...
The aim of this study is to determine if a noninvasive and cuffless blood pressure (BP) estimation method using pulse transit time (PTT) can accurately track the changes in BP after a treadmill exercise. Experiments were conducted on 12 healthy subjects, who were directed to run on a treadmill at 10 kph for 4 minutes. For each subject, 13 trials were recorded in total, including 11 trials obtained...
The aim of this study is to determine if a noninvasive and cuffless blood pressure (BP) estimation method using pulse transit time (PTT) can accurately track the changes in BP after a treadmill exercise. Experiments were conducted on 12 healthy subjects, who were directed to run on a treadmill at 10 kph for 4 minutes. For each subject, 13 trials were recorded in total, including 11 trials obtained...
Pressure is one of the most sensitive factors influencing the arterial wall compliance. Pulse transit time (PTT) is one simple way to assess arterial compliance changes. This study investigated the relationship between external cuff pressure and pulse transit time. The study was performed on 10 subjects with different cuff pressures (0, 10, 20 and 30 mmHg) on the lower arm, upper arm and whole arm...
Pulse transit time (PTT) is important in the study of arterial viscoelastic properties, wave reflections and sympathetic activities. PTT is usually defined as the time interval between the R-wave in the electrocardiogram (ECG) and a characteristic point in the photoplethysmogram. However, it was found that photoplethysmographic signals are affected by the contacting force between the photoplethysmographic...
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