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Many cardiovascular diseases can be detected using a non-invasive measurement of thoracic impedance. For this purpose, a device was designed and constructed, allowing the simultaneous evaluation of both impedance cardiography (ICG) and electro-cardiographic (ECG) signals. The acquired data is displayed online and further processed within the ICGstudio software application. The mentioned software allows...
This paper presents a wearable vital signs monitor at the ear. The monitor measures the electrocardiogram (ECG), ballistocardiogram (BCG), and photoplethysmogram (PPG) to obtain pre-ejection period (PEP), stroke volume (SV), cardiac output (CO), and pulse transit time (PTT). The ear is demonstrated as a natural anchoring point for the integrated sensing of physiological signals. All three signals...
The paper aims to develop a method to non-invasively characterize cardiac blood-flow dynamics, including stroke volume and cardiac output along with spatial resolution of flow profiles. The research develops techniques to gather additional information about blood flow that can supplement present non-invasive ultrasound techniques for the evaluation of heart failure. This additional blood flow information...
A mathematical model, based on our previous pulsatile nonlinear multi-element cardiovascular model, was tested and improved to study cardiovascular response under graded exercise levels. Ten healthy subjects were studied using cycle-ergometry exercise test with constant workloads ranging from 25 Watt to 125 Watt. Breath by breath gas exchange, heart rate, cardiac output, stroke volume and blood pressure...
To study the possible cardiac function alternation in hypertension, 13 cardiac function parameters such as blood pressure (BP), cardiac output (CO), ejection time (ET) and stroke volume (SV), etc. were measured in 898 subjects. The subjects were grouped into 3 groups by blood pressure, namely: normotension, prehypertension and hypertension group. Statistic analyses showed that in prehypertension subjects,...
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