scholarly journals Analyzing the formation of normal and abnormal O waves in thoracic impedance graph using the impedance change components for aorta, blood vessels in lung and ventricles

2014 ◽  
Vol 21 (2) ◽  
pp. 176-182 ◽  
Author(s):  
Kuang Nan-Zhen ◽  
Xiao Qiu-Jin ◽  
He Bai-Qing ◽  
Fu Jing-Juan ◽  
Kuang Ming-Xing
Keyword(s):  
Blood Vessels ◽  
Impedance Change ◽  
Thoracic Impedance ◽  
Change Components

Studies on separating the impedance change components of blood vessels and ventricles in thorax from mixed impedance signals on chest surface

2011 ◽  
Vol 38 (6Part1) ◽  
pp. 3270-3278 ◽  
Author(s):  
Kuang Ming-Xing ◽  
Xiao Qiu-Jin ◽  
Kuang Nan-Zhen ◽  
Cui Chao-Ying ◽  
Hu Ai-Rong
Keyword(s):  
Blood Vessels ◽  
Impedance Change ◽  
Change Components

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.

Impedance measurement of tidal volume and ventilation

1965 ◽  
Vol 20 (3) ◽  
pp. 565-568 ◽  
Author(s):  
L. H. Hamilton ◽  
J. D. Beard ◽  
R. C. Kory
Keyword(s):  
Standard Deviation ◽  
Tidal Volume ◽  
Breathing Pattern ◽  
Impedance Measurement ◽  
Normal Subjects ◽  
Impedance Change ◽  
Thoracic Impedance ◽  
Transthoracic Impedance ◽  
Tissue Resistance ◽  
Diode Voltage

Thoracic impedance changes have been used to measure tidal volume and ventilation in normal subjects. Tidal volume was measured directly and total ventilation was accumulated with a diode voltage pump. The size, shape, and placement of the electrodes affected the reliability with which the system measured ventilation. A high correlation was demonstrated between transthoracic resistance or capacitance changes and ventilation when special narrow ridged electrodes were applied bilaterally on the thorax. The variability between accumulated impedance changes and ventilation measured with a spirometer had a standard deviation less than ±6% of the ventilation. A linear relationship was demonstrated between lung volume change and impedance change for subjects in the standing, sitting, or supine positions, whether the breathing pattern was normal, predominantly thoracic, or predominantly abdominal. transthoracic impedance; tissue resistance; tissue capacitance Submitted on June 24, 1964

scholarly journals Study on the Improvement of Electrical Facility System of Automated External Defibrillators by Real-Time Measurement of Thoracic Impedance

2020 ◽  
Vol 10 (9) ◽  
pp. 3323
Author(s):  
Tae-Jin Ha ◽  
Hong-Gyu Park ◽  
Su-Kang Park ◽  
Sang-Geon Park
Keyword(s):  
Cardiac Arrest ◽  
Real Time ◽  
Electric Shock ◽  
Artificial Respiration ◽  
Cardiac Arrest Patient ◽  
Impedance Change ◽  
Thoracic Impedance ◽  
Peak Current ◽  
Shock Energy ◽  
Facility System

Sudden Cardiac Arrest (SCA) is a serious emergency disease that has increased steadily every year. To this end, an Automated External Defibrillator (AED) is placed in a public place so that even non-professional medical personnel can respond to SCA. However, the thoracic impedance of patients changes due to CardioPulmonary Resuscitation (CPR) and artificial respiration during first aid treatment. In addition, changes in chest statues due to gender, age, and accidents cause changes in thoracic impedance in real time. The change in thoracic impedance caused by this has a negative effect on the intended electrical energy of the automatic heart shocker to the emergency patient. To prove this, we divided it into adult and pediatric modes and experimented with the energy error of the AED according to the same impedance change. When the first peak current was up to 56.4 (A) and at least 8.4 (A) in the adult mode, the first peak current was up to 32.2 (A) and at least 4.8 (A), respectively, when the impedance changed, the error of the current figure occurred. In this paper, the inverse relationship between thoracic impedance and electric shock energy according to the state of the cardiac arrest patient is demonstrated through the results of the experiment, and the need for an electric facility system that can revise for changes in thoracic impedance of the cardiac arrest patient by reflecting them on electric shock energy in real time is presented.

Thoracic impedance change equation deduced on the basis of parallel impedance model and Ohm's law

2012 ◽  
Vol 39 (2) ◽  
pp. 1042-1045 ◽  
Author(s):  
Xiao Qiu-Jin ◽  
Wang Zhen ◽  
Kuang Ming-Xing ◽  
Wen Ping ◽  
Liu Pei ◽  
...  
Keyword(s):  
Impedance Change ◽  
Thoracic Impedance ◽  
Impedance Model ◽  
Ohm’S Law ◽  
Ohm's Law

Thoracic Impedance Change Rates in Implantable Devices Related to Clinical Scenarios of Patients with Decompensated Heart Failure

2012 ◽  
Vol 18 (10) ◽  
pp. S160
Author(s):  
Noboru Oda ◽  
Yukiko Nakano ◽  
Hiroki Ikenaga ◽  
Yoshikazu Watanabe ◽  
Hiroshi Kawazoe ◽  
...  
Keyword(s):  
Heart Failure ◽  
Decompensated Heart Failure ◽  
Implantable Devices ◽  
Impedance Change ◽  
Thoracic Impedance ◽  
Clinical Scenarios

Mechanism of the Formation for Thoracic Impedance Change

2010 ◽  
Vol 38 (3) ◽  
pp. 1007-1016 ◽  
Author(s):  
Ming-Xing Kuang ◽  
Qiu-Jin Xiao ◽  
Chao-Ying Cui ◽  
Nan-Zhen Kuang ◽  
Wen-Qin Hong ◽  
...  
Keyword(s):  
Impedance Change ◽  
Thoracic Impedance

Author response for "Hemovasculogenic origin of blood vessels in the developing mouse brain"

2020 ◽  
Author(s):  
Miguel A. Gama Sosa ◽  
Rita De Gasperi ◽  
Gissel M. Perez ◽  
Patrick R. Hof ◽  
Gregory A. Elder
Keyword(s):  
Blood Vessels ◽  
Mouse Brain ◽  
Author Response ◽  
Developing Mouse Brain

Evidence for a Blood Ganglion Barrier in the Superior Cervical Ganglion of the Rat

1982 ◽  
Vol 40 ◽  
pp. 204-204
Author(s):  
D. M. DePace
Keyword(s):  
Blood Vessels ◽  
Superior Cervical Ganglion ◽  
Peripheral Nerves ◽  
Time Schedule ◽  
Transmission Electron ◽  
Cervical Ganglion ◽  
The Central Nervous System ◽  
Cervical Ganglia ◽  
Capillary Circulation ◽  
And Control

The majority of blood vessels in the superior cervical ganglion possess a continuous endothelium with tight junctions. These same features have been associated with the blood brain barrier of the central nervous system and peripheral nerves. These vessels may perform a barrier function between the capillary circulation and the superior cervical ganglion. The permeability of the blood vessels in the superior cervical ganglion of the rat was tested by intravenous injection of horseradish peroxidase (HRP). Three experimental groups of four animals each were given intravenous HRP (Sigma Type II) in a dosage of.08 to.15 mg/gm body weight in.5 ml of.85% saline. The animals were sacrificed at five, ten or 15 minutes following administration of the tracer. Superior cervical ganglia were quickly removed and fixed by immersion in 2.5% glutaraldehyde in Sorenson's.1M phosphate buffer, pH 7.4. Three control animals received,5ml of saline without HRP. These were sacrificed on the same time schedule. Tissues from experimental and control animals were reacted for peroxidase activity and then processed for routine transmission electron microscopy.

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