scholarly journals Low Cost Non-İnvasive Portable Monitor Platform for Cardiac Biopotential and Transthoracic Impedance Measurements

2021 ◽  
Author(s):  
Oya Köksal ◽  
Erdem Haberal
Keyword(s):  
Reference Value ◽  
Raspberry Pi ◽  
Invasive Technique ◽  
Impedance Change ◽  
Thoracic Impedance ◽  
Current Frequency ◽  
Impedance Measurements ◽  
Non Invasive ◽  
Thoracic Electrical Bioimpedance ◽  
Electrical Bioimpedance

Abstract Purpose Simultaneous monitoring of ECG and thoracic electrical bioimpedance (TEB) is important in evaluating cardiovascular performance. TEB is a non-invasive technique based on measuring the impedance value that changes in the chest area depending on the heartbeat. Within the framework of this study, it can be used in home monitoring and biotelemetry applications to measure thoracic electrical bioimpedance (TEB), ECG and ICG. Methods Within the scope of this study, a four-electrode TEB measurement system was designed and built using the Raspberry Pi single board computer and its original monitor, ESP32 and EVAL-ADAS1000SDZ evaluation board. With the designed system, ECG and thoracic impedance measurements at 50 kHz current frequency were taken as real-time over a single channel. Delta_Z and ICG signals were created from thoracic impedance values with the developed software.ResultsWhile the thoracic impedance value varies between 15-45 Ω, the 67 thoracic impedance value measured with the designed system is approximately 1000 times the 68 reference value. The impedance change in the thoracic region was measured with the designed 69 system between 0.1-0.2 Ω values, and the compatibility of these values with reference values was 70 determined. While the reference value of the dZ / dt signal is 0.8 - 3.5 Ω / s, this value is between 2.3 - 71 5.3 Ω / s in the measurements taken with the designed system.Conclusion The prototype is achieved in detecting small changes in the thoracic impedance signal. The prototype is cheap, portable, small-sized and medically safe, so it is suitable for home care services and clinics. In addition, the developed system can be adapted to wearable technology. In order to increase the success of the system, the impedances values added to the thoracic impedance value should be determined and a calibration procedure should be established.

scholarly journals Thoracic electrical bioimpedance in the follow-up of patients with cardiovascular disorders

2005 ◽  
Vol 133 (5-6) ◽  
pp. 297-302
Author(s):  
Vesna Stojanov ◽  
Mirko Saranovic ◽  
Branko Jakovljevic ◽  
Katarina Paunovic
Keyword(s):  
High Frequency ◽  
Invasive Technique ◽  
Non Invasive ◽  
Arterial Blood ◽  
Thoracic Electrical Bioimpedance ◽  
Patients With Heart Failure ◽  
Before And After ◽  
Electrical Bioimpedance ◽  
Low Amplitude

Thoracic electrical bioimpedance is a new non-invasive technique for obtaining haemodynamic parameters. The method involves the passing of low amperage, high frequency current through the thorax. The current induces a change of resistance within the thorax, which is registered by electrodes. The overall impedance of the thorax is a measure of the electrical resistance of the thorax to this high frequency, low amplitude current. In clinical practice, thoracic electrical bioimpedance has been applied in diagnostic, therapeutic, and prognostic use in patients with heart failure and hypertension, patients with pacemakers, within the scope of early diagnosis of implant rejection following heart transplantation, as well as in patients with kidney disorders, before and after dialysis. However, one of its most important applications is in the determination of antihypertensive therapy, because it provides the parameters that reflect the genesis of arterial blood pressure, in assessing these parameters, optimal therapy adjusted to the haemodynamic status of each patient can be prescribed.

Transthoracic electrical bioimpedance: A non-invasive technique for the evaluation of the haemodynamic alterations in patients with liver cirrhosis

2005 ◽  
Vol 37 (10) ◽  
pp. 786-792 ◽  
Author(s):  
F. Dazzani ◽  
M. Micati ◽  
P. Caraceni ◽  
G.M. Drago ◽  
M. Domenicali ◽  
...  
Keyword(s):  
Liver Cirrhosis ◽  
Invasive Technique ◽  
Non Invasive ◽  
Electrical Bioimpedance

scholarly journals Non-invasive thoracic electrical bioimpedance technique-derived hemodynamic reference ranges in Chinese Han adults

2021 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Qing-Long Meng ◽  
Yan Sun ◽  
Hui-Jing He ◽  
Hao Wang ◽  
Guang-Liang Shan
Keyword(s):  
Reference Ranges ◽  
Chinese Han ◽  
Non Invasive ◽  
Thoracic Electrical Bioimpedance ◽  
Electrical Bioimpedance ◽  
Han Adults

Non-Invasive Measurement Techniques for Measuring Bilayers in Droplet-Interface-Bilayers

2009 ◽  
Author(s):  
M. Austin Creasy ◽  
Donald J. Leo
Keyword(s):  
Lipid Membranes ◽  
Measurement Techniques ◽  
Building Blocks ◽  
Invasive Technique ◽  
Impedance Measurements ◽  
Synthetic Membranes ◽  
Non Invasive ◽  
Droplet Interface Bilayer ◽  
A Cell ◽  
Living Organisms

Phospholipids and membrane proteins are two of the fundamental building blocks of cell membranes in living organisms. These molecules are amphipathic and synthetic membranes made of phospholipids, called bilayer lipid membranes (BLMs), are used to understand the characteristics of a cell membrane. Studies of these BLMs have been performed on both solid support and liquid support systems. A droplet interface bilayer (DIB) is a liquid support system where a monolayer is formed around a water droplet placed in oil and a bilayer is formed when two of these droplets are placed in contact. For impedance measurements, electrodes are placed in the water on each side of the bilayer. The measurements first insure there is a bilayer and second to obtain information about the bilayer. In a DIB system the electrodes pierce the monolayer surrounding the droplet causing instabilities in the monolayer. This study focuses on a non-invasive technique for measuring the bilayer by using the electrodes to contact the monolayer around the droplets and take impedance measurements without piercing the monolayer.

Cardiac Output Measured by Transthoracic Impedance Cardiography at Rest, during Exercise and at Various Lung Volumes

1982 ◽  
Vol 63 (2) ◽  
pp. 107-113 ◽  
Author(s):  
A. T. Edmunds ◽  
S. Godfrey ◽  
Marion Tooley
Keyword(s):  
Cardiac Output ◽  
Lung Volume ◽  
Impedance Cardiography ◽  
Close Correlation ◽  
Invasive Technique ◽  
Breath Holding ◽  
Impedance Measurements ◽  
Respiratory Illnesses ◽  
Non Invasive ◽  
Transthoracic Impedance

1. Cardiac output measured by transthoracic impedance cardiography has been compared with simultaneous measurements made by the indirect Fick CO2 rebreathing method in nine adults and 14 children. All were healthy normal volunteers. Sixty-six comparisons were made at rest and during steady exercise at work loads up to 100 W. 2. Impedance measurements of cardiac output were consistently higher than indirect Fick measurements of cardiac output, but after application of a correction factor related to packed cell volume there was close correlation between the results obtained by the two methods (r = 0·94). 3. The mean coefficient of variation of impedance measurements of cardiac output was 13% at rest and 5% during steady-state exercise. 4. Changes of lung volume due to breath holding or resulting from addition of an expiratory resistance did not affect the measurement of cardiac output by impedance. 5. Transthoracic impedance cardiography is a rapid, non-invasive technique for measurement of cardiac output. It requires very little active co-operation from the subject. The method would probably give reliable results for patients with respiratory illnesses such as acute asthma or bronchiolitis, during which changes of lung volume may be expected to occur.

Thoracic electrical bioimpedance: a non-invasive measure of cardiac output for porcine research

1998 ◽  
Vol 32 (3) ◽  
pp. 324-329
Author(s):  
C. J. Broomhead ◽  
S. J. Wright ◽  
K. M. Kiff ◽  
P. S. Withington
Keyword(s):  
Cardiac Output ◽  
Correlation Coefficient ◽  
Comparative Studies ◽  
Porcine Model ◽  
Continuous Data ◽  
Large White ◽  
Pearson Product Moment Correlation ◽  
Non Invasive ◽  
Thoracic Electrical Bioimpedance ◽  
Electrical Bioimpedance

A comparison of two techniques for measuring cardiac output, thermodilution (TD) and thoracic electrical bioimpedance (TEB), was undertaken in a porcine model. Eight anaesthetized large white pigs were studied. A total of 436 paired measurements were performed over a range of cardiac outputs from 1.7 to 15.11/min as measured by thermodilution. The Pearson product moment correlation coefficient was r=0.963 with P < 0.001. Analysis by Bland and Altman statistics revealed a mean difference (bias) of -0.021/min and the limits of ±1.6l/min, similar to figures found in human comparative studies. These results confirm that thoracic electrical bioimpedance is a valid method of measuring cardiac output in pigs. It has significant advantages compared to thermodilution, in particular it is cheap, simple to use, non-invasive and provides continuous data.

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