A type of impedance plethysmography in which bioelectrical impedance is measured between electrodes positioned around the neck and around the lower thorax. It is used principally to calculate stroke volume and cardiac volume, but it is also related to myocardial contractility, thoracic fluid content, and circulation to the extremities.
In about 250 species of electric fishes, modified muscle fibers forming disklike multinucleate plates arranged in stacks like batteries in series and embedded in a gelatinous matrix. A large torpedo ray may have half a million plates. Muscles in different parts of the body may be modified, i.e., the trunk and tail in the electric eel, the hyobranchial apparatus in the electric ray, and extrinsic eye muscles in the stargazers. Powerful electric organs emit pulses in brief bursts several times a second. They serve to stun prey and ward off predators. A large torpedo ray can produce of shock of more than 200 volts, capable of stunning a human. (Storer et al., General Zoology, 6th ed, p672)
The sounds heard over the cardiac region produced by the functioning of the heart. There are four distinct sounds: the first occurs at the beginning of SYSTOLE and is heard as a "lubb" sound; the second is produced by the closing of the AORTIC VALVE and PULMONARY VALVE and is heard as a "dupp" sound; the third is produced by vibrations of the ventricular walls when suddenly distended by the rush of blood from the HEART ATRIA; and the fourth is produced by atrial contraction and ventricular filling.
Graphic registration of the heart sounds picked up as vibrations and transformed by a piezoelectric crystal microphone into a varying electrical output according to the stresses imposed by the sound waves. The electrical output is amplified by a stethograph amplifier and recorded by a device incorporated into the electrocardiograph or by a multichannel recording machine.
A technique of measuring the dielectric properties of materials, which vary over a range of frequencies depending on the physical properties of the material. The technique involves measuring, over a range of frequencies, ELECTRICAL IMPEDANCE and phase shift of an electric field as it passes through the material.
Classical loci in ACUPUNCTURE. They are main and collateral channels, regarded as a network of passages, through which vital energy (Qi) circulates and along which acupoints (ACUPUNCTURE POINTS) are distributed. The meridians are a series of 14 lines upon which more than 400 acupoints are located on the body. (The Pinyin Chinese-English Dictionary, p. 359; Dr. Wu Lancheng, Academy of Traditional Chinese Medicine, Beijing)
Electrical Equipment and Supplies
Encyclopedias as Topic
Radiotherapy Planning, Computer-Assisted
Magnetic Resonance Imaging
Cardiac Resynchronization Therapy
Cardiac Resynchronization Therapy Devices
Types of artificial pacemakers with implantable leads to be placed at multiple intracardial sites. They are used to treat various cardiac conduction disturbances which interfere with the timing of contraction of the ventricles. They may or may not include defibrillating electrodes (IMPLANTABLE DEFIBRILLATORS) as well.
Cardiac Pacing, Artificial
Abnormal cardiac rhythm that is characterized by rapid, uncoordinated firing of electrical impulses in the upper chambers of the heart (HEART ATRIA). In such case, blood cannot be effectively pumped into the lower chambers of the heart (HEART VENTRICLES). It is caused by abnormal impulse generation.
Agents used for the treatment or prevention of cardiac arrhythmias. They may affect the polarization-repolarization phase of the action potential, its excitability or refractoriness, or impulse conduction or membrane responsiveness within cardiac fibers. Anti-arrhythmia agents are often classed into four main groups according to their mechanism of action: sodium channel blockade, beta-adrenergic blockade, repolarization prolongation, or calcium channel blockade.
Impedance cardiography (often abbreviated as ICG, or Thoracic Electrical Bioimpedance (TEB)) measures changes in electrical ... Electrical cardiometry is a non-invasive method similar to Impedance cardiography; both methods measure thoracic electrical ... Ventura HO, Taler SJ, Strobeck JE (February 2005). "Hypertension as a hemodynamic disease: the role of impedance cardiography ... doi:10.1007/s00134-005-2781-3. Bernstein, Donald P (2010). "Impedance cardiography: Pulsatile blood flow and the biophysical ...
John G. Webster
Electrical impedance tomography, Adam Hilger, Bristol, England, 1990. Webster, J. G. (ed.), Teaching design in electrical ... including ongoing projects with impedance cardiography and atrial fibrillation. Honors And Awards,. Henderson R.P. and Webster ... He first proposed the idea of electrical impedance tomography as a medical imaging technique in a publication in 1978. In his ... of Electrical Eng., Univ. of Wisconsin-Madison 1976-80 Director of Biomedical Eng. Ctr., Univ. of Wisconsin-Madison 1973-1999 ...
... is similar to impedance cardiography in the fact that both methods measure thoracic electrical ... where Z0 is the quasi-static portion of the electrical impedance (base impedance), ΔZR are the changes of impedance due to the ... Both Impedance cardiography and Electrical Cardiometry derive SV and CO from measurements of TEB, but the underlying model is ... Impedance cardiography is a method of non-invasively monitoring hemodynamics, through the use of 4 dual sensors placed on the ...
... loudspeakers High impedance Immittance Impedance analyzer Impedance bridging Impedance cardiography Impedance control Impedance ... Instruments used to measure the electrical impedance are called impedance analyzers. The term impedance was coined by Oliver ... In electrical engineering, electrical impedance is the measure of the opposition that a circuit presents to a current when a ... to rapidly measure the electrical impedance of various electrical devices. The LCR meter (Inductance (L), Capacitance (C), and ...
... (ICG), also referred to as electrical impedance plethysmography (EIP) or Thoracic Electrical ... Impedance cardiography (ICG) is a non-invasive technology measuring total electrical conductivity of the thorax and its changes ... The use of impedance cardiography in psychophysiological research was pioneered by the publication of an article by Miller and ... The electrical and impedance signals are processed to determine fiducial points, which are then utilized to measure and ...
Quantium Medical Cardiac Output
The Impedance Cardiography (ICG or Ztot) signal represents the changes of the thoracic impedance due to variations in the blood ... The impedance plethysmography allows determining changes in volume of the body tissues based on the measurement of the electric ... Woltjer, H.H.; Bogaard, H.J.; de Vries, J.M. (1997). "The technique of impedance cardiography". Eur. Heart J. 18 (9): 1396-1403 ... quantium Medical Cardiac Output (qCO) uses impedance cardiography in a simple, continuous, and non-invasive way to estimate the ...
The principles behind the device Perl designed for this project became the foundation for impedance cardiography. This work ... Konietzny F, Perl ER, Trevino D, Light A, and Hensel H. Sensory experiences in man evoked by intraneural electrical stimulation ... Ainsley Iggo at the University of Edinburgh proved vital in allowing Perl expertise in recording the electrical activity of C- ...
William V. Judy
Already in 1981, Judy did a study showing that the transthoracic electrical impedance method for measuring cardiac output in ... 1981). "A comparison of cardiac output as simultaneously measured by indicator dilution and impedance cardiography in normal ... The non-invasive bioelectrical impedance technology is a low-cost high technology system designed by Judy as a solution to high ... Judy was introduced to the bioelectrical impedance method as a noninvasive means of measuring stroke volume and cardiac output ...
Electrical cardiometry. *Esophogeal doppler. *Hemodynamics of the Aorta. *Impedance cardiography. *Photoplethysmograph. * ...
... and/or impedance cardiography (ICG). Furthermore, there are no current cures for pulmonary arterial hypertension, but there are ... and perform various other functions to maintain chemical and electrical homeostasis in the neuronal environment. Constriction ...
Artificial cardiac pacemaker
Impedance: A test to measure lead integrity. Large and/or sudden increases in impedance can be indicative of a lead fracture ... "IEEE Milestone in Electrical Engineering and Computing". Retrieved September 5, 2009.. *^ "Paul Maurice Zoll". Harvard Gazette ... In 1950, Canadian electrical engineer John Hopps designed and built the first external pacemaker based upon observations by ... Note the circle around one of the sharp electrical spikes in the position where one would expect the P wave. ...
Synchronized electrical cardioversion uses a therapeutic dose of electric current to the heart at a specific moment in the ... Electrical. To perform synchronized electrical cardioversion, two electrode pads are used (or, alternatively, the ... Defibrillation uses a therapeutic dose of electric current to the heart at a random moment in the cardiac cycle, and is the ... Electrical therapy is inappropriate for sinus tachycardia, which should always be a part of the differential diagnosis. ...
It is an electrical device, however, and should be kept dry; showering or swimming should probably be avoided. Monitors can be ... When used to study the heart, much like standard electrocardiography, the Holter monitor records electrical signals from the ... the monitoring of the electrical activity of the cardiovascular system) for at least 24 to 48 hours (often for two weeks at a ... keeping a log of the heart's electrical activity throughout the recording period. A 12 lead Holter system is also available ...
assess the electrical activity/conduction pathways of heart. A cardiac electrophysiology study (EP test or EP study) is a ... This is done by injecting electric current into the conductive pathways and into the endocardium at various places. Last, the ... If at any step during the EP study the electrophysiologist finds the source of the abnormal electrical activity, they may try ... minimally invasive procedure that tests the electrical conduction system of the heart to assess the electrical activity and ...
When ablating tissue near the AV node (a special conduction center that carries electrical impulses from the atria to the ... Cryotherapy is able to produce a temporary electrical block by cooling down the tissue believed to be conducting the arrhythmia ... Techniques also exist where incisions are used in the open heart to interrupt abnormal electrical conduction (Maze procedure). ... Another type of cryoablation is used to restore normal electrical conduction by freezing tissue or heart pathways that ...
... (RFA)[a] is a medical procedure in which part of the electrical conduction system of the heart, tumor ... Radiofrequency energy is used in heart tissue or normal parts to destroy abnormal electrical pathways that are contributing to ... The practitioner first "maps" an area of the heart to locate the abnormal electrical activity (electrophysiology study) before ...
... (ECG or EKG[a]) is the process of recording the electrical activity of the heart over a period of time ... The etymology of the word is derived from the Greek electro, because it is related to electrical activity, kardia, Greek for ... Look at electrical activity from the vantage point of the anterior wall of the right and left ventricles (Sternocostal surface ... Look at electrical activity from the vantage point of the septal surface of the heart (interventricular septum) ...
Administration of an electric shock to the subject's heart, termed defibrillation, is usually needed in order to restore a ... Impedance threshold device. *Slow code. *Lazarus syndrome, spontaneous autoresuscitation where attempts at artificial ... Even in the case of a "non-shockable" rhythm, such as pulseless electrical activity (PEA) where defibrillation is not indicated ... rather than asystole or pulseless electrical activity. Early shock when appropriate is recommended. CPR may succeed in inducing ...
Experimental and numerical study on optimal spot-electrodes arrays in transthoracic electrical impedance cardiography.
... for the non-invasive and continuous monitoring of stroke volume or cardiac output by detecting the electrical impedance of a ... Transthoracic electrical impedance (or admittance) cardiography is a simple technique ... Transthoracic electrical impedance (or admittance) cardiography is a simple technique for the non-invasive and continuous ... Cardiography, Impedance / methods*. Electrodes. Finite Element Analysis. Heart / physiology*. Humans. Models, Cardiovascular*. ...
Introduction Electric velocimetry (EV) is normally a kind of impedance cardiography, - Small Molecule Inhibitors of Protein...
Introduction Electric velocimetry (EV) is normally a kind of impedance cardiography,. by Ross Marshall ... Introduction Electric velocimetry (EV) is normally a kind of impedance cardiography, and it is a non-invasive and applicable ... After several adjustments towards the algorithm [1-5], impedance cardiography (thats, electric velocimetry (EV)) gadgets have ... Launch TC-DAPK6 supplier In the 1960s, impedance cardiography originated to monitor cardiac result (CO) . This technique is ...
Patent US7907998 - Bio-impedance apparatus and method - Google Patents
... the impedance measurements to determine the impedance of at least one of the lungs substantially independently of impedance of ... using the leads and the case to acquire at least a first and a second impedance measurement responsive to impedance of the ... A method of determining an impedance of at least one lung of a patient having an implanted pacemaker that comprises first and ... Hoetnik, A. E. et al.; "Comparing Spot Electrode Arrangements for Electric Impedance Cardiography"; Physiol. Meas. 23 (2002); ...
Impedance cardiography - Wikipedia
Impedance cardiography (ICG), also referred to as electrical impedance plethysmography (EIP) or Thoracic Electrical ... Impedance cardiography (ICG) is a non-invasive technology measuring total electrical conductivity of the thorax and its changes ... The use of impedance cardiography in psychophysiological research was pioneered by the publication of an article by Miller and ... The electrical and impedance signals are processed to determine fiducial points, which are then utilized to measure and ...
Chest electrical impedance tomography measures in neonatology and paediatrics - a survey on clinical usefulness.
Chest electrical impedance tomography (EIT) is currently applied in neonatal and paediatric patients mainly within clinical ... Cardiography, Impedance. A type of impedance plethysmography in which bioelectrical impedance is measured between electrodes ... Electrical Impedance Tomography of Stroke and Brain Injury. The purpose of this study is to determine if Electrical Impedance ... Electrical Impedance Tomography of Epilepsy. The purpose of this study is to determine if Electrical Impedance Tomography (EIT ...
element14 Essentials: Sensors II | element14 | Essentials
Bio-electrical (impedance cardiography). Despite the above time-tested technologies, photoplethysmographic technology (PPG) has ... While there are many types of physical conditions that IoT devices are capable of sensing - acoustic, electric, magnetic, ... "a device that receives a stimulus and responds with an electrical signal." ...
Cardiac output - Wikipedia
Impedance cardiography (often abbreviated as ICG, or Thoracic Electrical Bioimpedance (TEB)) measures changes in electrical ... Electrical cardiometry is a non-invasive method similar to Impedance cardiography; both methods measure thoracic electrical ... Ventura HO, Taler SJ, Strobeck JE (February 2005). "Hypertension as a hemodynamic disease: the role of impedance cardiography ... doi:10.1007/s00134-005-2781-3. Bernstein, Donald P (2010). "Impedance cardiography: Pulsatile blood flow and the biophysical ...
Patents filed at Sep 20 2016 | Electrical impedance techniques in tissue-mass detection and characterization | Patents.com
Respiration-gated cardiography , Signal analysis related to treatment sites , ... Electrical impedance techniques in tissue-mass detection and characterization. A device is described for measuring electrical ... Respiration-gated cardiography. In a cardiographic apparatus (10), a plurality of electrodes (16) are configured for operative ... A method includes storing baseline data representing at least one local or global electrical characteristics for at least a ...
The electrical impedance of pulsatile blood flowing through rigid tubes: an experimental investigation | SpringerLink
One such origin suggested in literature is the impedance variation... ... Small fluctuations present in an Impedance Cardiogram are often dismissed as noise, but may be due to unknown physiological ... K. R. Visser (1989) Electric properties of flowing blood and impedance cardiography. Ann Biomed Eng 17:463-73CrossRefGoogle ... 13th International Conference on Electrical Bioimpedance and the 8th Conference on Electrical Impedance Tomography pp 73-76 , ...
Human Physiology Core - SHP - Diabetes Research Center | UAB
Effects of the arterial radius and the center-line velocity on the conductivity and electrical impedance of pulsatile flow in...
In order to investigate the contribution of arterial radius and center-line velocity to the blood conductivity and electrical ... impedance of pulsatile flow in the human common carotid artery, we... ... Visser KR (1989) Electric properties of flowing blood and impedance cardiography. Ann Biomed Eng 17(5):463-473Google Scholar ... Proceedings 13th International Conference on Electrical Bio-impedance and the 8th Conference on Electrical Impedance Tomography ...
Magnetocardiograms in clinical medicine: unique information on cardiac ischemia, arrhythmias, and fetal diagnosis.
13th International Conference on Electrical Bioimpedance and the 8th Conference on Electrical Impedance Tomography | Ebook |...
13th International Conference on Electrical Bioimpedance and the 8th Conference on Electrical Impedance Tomography - Author: ... New Aspects of Estimating Electrical Participating Volume of the Thorax for Transthoracic Impedance Cardiography. J. Fortin, R ... Magneto-Acousto-Electrical Tomography: A New Imaging Modality for Electrical Impedance. Y. Xu, S. Haider, A. Hrbek. 78. ... 13th International Conference on Electrical Bioimpedance and the 8th Conference on Electrical Impedance Tomography. 308,80€ ...
Validation of the Ambulatory Impedance Cardiography Method | Springer for Research & Development
In this chapter it is described the problem of ambulatory impedance cardiography validation against the clinically accepted ... Validation of the Ambulatory Impedance Cardiography Method. In: Ambulatory Impedance Cardiography. Lecture Notes in Electrical ... Assessment of the haemodynamic response to exercise by means of electrical impedance cardiography: method, validation and ... Cybulski, G.: Dynamic impedance cardiography--the system and its applications. Pol. J. Med. Phys. Eng. 11(3), 127-209 (2005) ...
The Handbook of Cuffless Blood Pressure Monitoring - A Practical Guide for Clinicians, Researchers, and Engineers | Josep Solà ...
Age-related differences in the morphology of the impedance cardiography signal
... Journal of Electrical Bioimpedance. 2019, 10(1 ... Age-related differences in the morphology of the impedance cardiography signal. dc.date.accessioned. 2020-06-15T18:17:06Z. ... Impedance cardiography (ICG) is a non-invasive method of hemodynamic measurement, mostly known for estimation of stroke volume ... info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Electrical ...
DiVA - Sökresultat
Textrode-enabled transthoracic electrical bioimpedance measurements: towards wearable applications of impedance cardiography ... XV International Conference on Electrical Bio-Impedance (ICEBI) & XIV Conference on Electrical Impedance Tomography (EIT), 2013 ... Impedance Cardiography (ICG) is another modality of EBI that can benefit from the implementation and use of wearable sensors. ... In a similar way Impedance Cardiography (ICG) is anothermodality of EBI primarily concerned with the determination of Stroke ...
DE4243628A1 - Device for non-invasive determination of the spatial distribution of electrical impedance within a living...
System and method of impedance cardiography and heartbeat determination * 1992 * 1992-12-22 DE DE19924243628 patent/DE4243628A1 ... Impedance pneumography-A survey of instrumentation techniques. Smith et al. 1995. A real-time electrical impedance tomography ... Electrical impedance tomography; the construction and application to physiological measurement of electrical impedance images ... Electrical impedance tomography; the construction and application to physiological measurement of electrical impedance images ...
Medical Policies | Excellus BlueCross BlueShield
Noninvasive Measurement of Cardiac Bioimpedance: Impedance Cardiography (ICG), Thoracic Electrical Bioimpedance (TEB) Policy ... Electrical Stimulation: Transcutaneous Electrical Nerve (TENS), Percutaneous Electrical Nerve (PENS), H-Wave and Interferential ... Pelvic Floor Electrical Stimulation (PFES) as a Treatment of Urinary or Fecal Incontinence, Intravaginal Stimulation Policy ... Neuromuscular Electrical Stimulation (FNS, NMES, TES, VitalStim®) Policy 1.01.48 (posted 9/10/18) ...
Jan Olav Høgetveit - Fysisk institutt
Age-related differences in the morphology of the impedance cardiography signal. Journal of Electrical Bioimpedance. ISSN 1891- ... Impedance spectroscopy has been used to measure changes in electrical parameters during ischemia in various tissues. The ... Journal of Electrical Bioimpedance. ISSN 1891-5469. 6(1), s 18- 21 . doi: 10.5617/jeb.2571 ... Journal of Electrical Bioimpedance. ISSN 1891-5469. 2, s 13- 32 . doi: 10.5617/jeb.173 ...
Patent US7251524 - Apparatus and method for determining cardiac output in a living subject - Google Patents
Method of detecting a loss of electrical continuity in one or more of the terminals of the electrode patch, and selecting ... In one embodiment, the apparatus comprises a constant current source impedance cardiography (ICG) monitor adapted as a stand- ... can be obtained using impedance cardiography. Strictly speaking, impedance cardiography, also known as thoracic bioimpedance or ... prior art impedance cardiography techniques relates to the detection of a degraded electrical connection or loss of electrical ...
BLOOD FLOW ASSESSMENT OF VENOUS INSUFFICIENCY - Impedimed Limited
This may be done by applying electrical signals via a first set of electrodes, and measuring the impedance via a ... Impedance analysis can be used to measure calf muscle pump (CMP) function in a patient. ... This is used primarily for electromechanocardiography (ELMEC) or impedance cardiography (IKG) measurements for determining ... or an impedance parameter value to be determined.. At step 210, at least one second impedance value indicative of the impedance ...
PREVENT-HF: Prevention of Heart Failure Events With Impedance Cardiography Testing
... clinicaltrials.gov The purpose of this study is to determine whether outpatient therapeutic management guided by impedance ... Noninvasive impedance cardiography (ICG) is a simple test that utilizes changes in thoracic electrical impedance to measure ... Home » Topics » Heart Failure » Research » PREVENT-HF: Prevention of Heart Failure Events With Impedance Cardiography Testing ... More From BioPortfolio on "PREVENT-HF: Prevention of Heart Failure Events With Impedance Cardiography Testing". *Related ...
Bioimpedance and Bioelectricity Basics. (eBook, 2014) [WorldCat.org]
... and bioimpedance deals with the measurement of electrical conductivity. They are intimately linked to ... ... relates to the study of biological electrical currents, ... 9.3 Impedance Cardiography --. 9.4 Tissue Characterization in ... http:\/\/experiment.worldcat.org\/entity\/work\/data\/45070656#Topic\/electric_impedance<\/a>> # Electric Impedance<\/span>\n. ... impedance<\/a>> ; # Electric Impedance<\/span>\n. \u00A0\u00A0\u00A0\nschema:about<\/a>
StateMaster - Encyclopedia: Cardiac output
Impedance cardiography. Impedance cardiography (ICG) is a method which calculates CO from the measurement of changes in ... Electrical impedance, or simply impedance, is a measure of opposition to a sinusoidal alternating electric current. ... ... Impedance cardiography is a hemorheology technique of using sensors to detect the properties of the blood flow in the Thorax ... Electrical conduction system of the heart (Cardiac action potential). Category: Cardiology For transport in plants, see ...
Validity of cardiac output measurement by computer-averaged impedance cardiography, and comparison with simultaneous...
Mean impedance output was 4.5 +/- 1.27 liter/min Reproducibility was comparable for impedance (0.0059 +/- 0.639) and ... Impedance cardiac output values agree and correlate highly with quality-controlled thermodilution outputs across a wide range ... Individual impedance values correlated with paired thermodilution determinations (r = 0.75; p less than 0.0001). Each patients ... In all, 43 patients (14 men and 29 women = 201 pairs) were studied by simultaneously performed impedance and thermal ...
Bioelectrical Impedance Methods for Noninvasive Health Monitoring: A Review
... electrical impedance plethysmography (IPG), impedance cardiography (ICG), and electrical impedance tomography (EIT) have been ... Under the alternating electrical excitation, biological tissues produce a complex electrical impedance which depends on tissue ... As the impedance responses of these tissue parameters vary with frequencies of the applied signal, the impedance analysis ... a number of impedance based noninvasive tissue characterization techniques such as bioelectrical impedance analysis (BIA), ...
Heart Success Program for Heart Failure - Atlantic Health
Early Poststroke Rehabilitation Using a Robotic Tilt-Table Stepper and Functional Electrical Stimulation
Impedance cardiography and transcranial doppler sonography were performed before, during, and after training. Hemiparesis was ... Early Poststroke Rehabilitation Using a Robotic Tilt-Table Stepper and Functional Electrical Stimulation. Alexey N. Kuznetsov,1 ... Tilt-table stepping robots and functional electrical stimulation (FES) may prevent these reactions. Objective. This controlled ...
Patente US20030028221 - Cardiac rhythm management system for edema - Google Patentes
Electrical Muscle Controller. US20080125826 *. 7 Nov 2007. 29 May 2008. Andres Belalcazar. Impedance Monitoring For Detecting ... System and method of impedance cardiography monitoring. US5454377 *. 8 Oct 1993. 3 Oct 1995. The Ohio State University. Method ... Non-invasive monitoring of hemodynamic parameters using impedance cardiography. US6186955 *. 16 Nov 1998. 13 Feb 2001. Gail D. ... System and method of impedance cardiography and heartbeat determination. US5355894 *. 23 Ago 1993. 18 Oct 1994. Siemens ...
TomographyPlethysmographyNoninvasiveMeasurementElectrodesBioelectrical impedancStroke volumeThoraxThermodilutionWhole-body Impedance CardiographyHigh Definition Impedance CardiographyHemodynamicConductivityEchocardiographyAmbulatory impedance cardiographySpectroscopyTransthoracicExpected impedance measurementsSignalsHypertensionChestArterialVelocimetryAdmittanceBioreactanceConductanceLeft ventricularBaseline thoracic impedanceElectrode polarization impedanceResistanceClinicalBioimpedance cardiographyDiagnosticImpedence CardiographyDiagnosisSignalApparatusParametersJournal of Electrical BioimpedanceAlgorithmFinite ElementCybulski1960sStatic impedanceSecond impedanceLungsElectrocardiogramFluidDilutionPhysioFlowPulsatile bloodPhysiologicalAssessmentHeart
- Imaging fast electrical activity in the brain during ictal epileptiform discharges with electrical impedance tomography. (bioportfolio.com)
- Electrical Impedance Tomography (EIT) is an emerging medical imaging technique which can produce tomographic images of internal impedance changes within an object using non-penetrating surface electro. (bioportfolio.com)
- Detection of Vesicoureteral Reflux using Electrical Impedance Tomography. (bioportfolio.com)
- The purpose of this study is to detect vesicoureteral reflux (VUR) non-invasively using electrical impedance tomography (EIT). (bioportfolio.com)
- Regional pulmonary effects of bronchoalveolar lavage procedure determined by electrical impedance tomography. (bioportfolio.com)
- Three-dimensional Electrical Impedance Tomography With Multiplicative Regularization. (bioportfolio.com)
- The multiplicative regularization scheme is applied to three-dimensional electrical impedance tomography (EIT) image reconstruction problem to alleviate its ill-posedness. (bioportfolio.com)
- Bi-frequency symmetry difference electrical impedance tomography - a novel technique for perturbation detection in static scenes. (bioportfolio.com)
- A novel method for the imaging of static scenes using Electrical Impedance Tomography (EIT) is reported with implementation and validation using numerical and phantom models. (bioportfolio.com)
- The goal of this feasibility study is to evaluate the ability of Electrical Impedance Tomography (EIT) for providing regional and quantitative information about the extent and nature of br. (bioportfolio.com)
- The purpose of this study is to evaluate the Genesis Electrical Impedance Tomography (EIT) imaging system for use in pediatric respiratory disease populations including neuromuscular and b. (bioportfolio.com)
- His research covered hybrid uses of Photo-Plethysmograhy (PPG), Electro-Cardiography (ECG), Impedance Cardiography (ICG), Phono-Cardiography (PCG) and Electrical Impedance Tomography (EIT). (springer.com)
- A non-invasive determination of the electrical impedance or their distribution can take place via a so-called elec trical impedance tomography, such. (google.com)
- Over past few decades, a number of impedance based noninvasive tissue characterization techniques such as bioelectrical impedance analysis (BIA), electrical impedance spectroscopy (EIS), electrical impedance plethysmography (IPG), impedance cardiography (ICG), and electrical impedance tomography (EIT) have been proposed and a lot of research works have been conducted on these methods for noninvasive tissue characterization and disease diagnosis. (hindawi.com)
- Abstract: Electrical impedance tomography (EIT) is an promising imaging technology for continuous bedside monitoring of ventilation and perfusion. (worldcat.org)
- He last taught Biomedical Engineering Introduction to Bioinstrumentation during spring He first proposed the idea of electrical impedance tomography as a medical imaging technique in a publication in In his spare time, Webster works with undergraduate biomedical engineering design teams at the University of Wisconsin-Madison, including ongoing projects with impedance cardiography and atrial fibrillation. (yug-avtosport.ru)
- 2. Inverse Problems of Electromagnetic Fields Theory, Optimal Shape Design, Shape Reconstruction and Image Reconstruction in Electrical Impedance, Diffuse Optical Tomography and Eddy Current Tomography, Neural Network Application to Field Theory, Set Level Method application to Inverse Problems of Electromagnetic Field. (docplayer.net)
- Electric Impedance Tomography: New algorithm for image reconstruction - research project supported by Government Commission for Scientific Research Project leader. (docplayer.net)
- Electrical impedance tomography (EIT), Diffuse optical tomography (DOT). (aalto.fi)
- A type of impedance plethysmography in which bioelectrical impedance is measured between electrodes positioned around the neck and around the lower thorax. (bioportfolio.com)
- Impedance cardiography (ICG), also referred to as electrical impedance plethysmography (EIP) or Thoracic Electrical Bioimpedance (TEB) has been researched since the 1940s. (wikipedia.org)
- Impedance Plethysmography techniques which use the changes in electrical impedance over body surface for measurement of changes in the tissue volumes can be used to study hemodynamics. (ukessays.com)
- Research in the field of Impedance Cardiography started with the study of flow of fluids in body, especially in cardiac area using Impedace Plethysmography techniques since 1940s [1Bonjer]. (ukessays.com)
- Many researchers have tried to apply the electrical impedance method to clinical measurement and therapy, such as impedance Plethysmography, impedance cardiography, impedance CT, fluid volume measurement, hyperthermia, estimation of the effects of electromagnetic wave and so on. (nii.ac.jp)
- Noninvasive impedance cardiography (ICG) is a simple test that utilizes changes in thoracic electrical impedance to measure thoracic fluid content, changes in the duration of cardiac ejection and the velocity of blood flow within the aorta. (bioportfolio.com)
- Under the alternating electrical excitation, biological tissues produce a complex electrical impedance which depends on tissue composition, structures, health status, and applied signal frequency, and hence the bioelectrical impedance methods can be utilized for noninvasive tissue characterization. (hindawi.com)
- The accuracy and reproducibility of noninvasive cardiac output determinations by computer-averaged impedance cardiography were compared with those of simultaneously performed thermodilution cardiac output. (semanticscholar.org)
- A noninvasive means of determining cardiac output in which the stroke volume of each cardiac contraction is determined by measuring beat-to-beat changes in the electrical impedance of the chest and neck. (thefreedictionary.com)
- Impedance Cardiography (ICG) is a noninvasive and flexible method of calculating cardiac stroke volume providing information that is similar to invasive monitoring at low cost and risk. (ukessays.com)
- This helps to achieve the application of noninvasive detection cardiac hemodynamic parameters in clinical treatments by using impedance method . (bvsalud.org)
- One type of noninvasive system is called impedance cardiography (ICG) or thoracic electrical bioimpedance. (aacnjournals.org)
- Most research employing impedance cardiography , which provides noninvasive and affordable measurements of the cardiovascular response, has focused on the study of exercise physiology (Bogaard et al. (freethesaurus.com)
- A method of determining an impedance of at least one lung of a patient having an implanted pacemaker that comprises first and second leads and a case, the method comprising: a) using the leads and the case to acquire at least a first and a second impedance measurement responsive to impedance of the patient's. (google.ca)
- 3. A method according to claim 1 , wherein, for each impedance measurement, a different configuration of the first and second leads is used than is used for any other of the impedance measurements, for generating current or for measuring voltage or for both. (google.ca)
- 4. A method according to claim 3 , wherein, for the first and second impedance measurements, the current is generated only between the case and one of the leads, the same lead for both the first and second impedance measurements, and the voltage involves only a potential difference between the case and one of the leads, a different one for the first impedance measurement than for the second impedance measurement. (google.ca)
- 6. A method according to claim 5 , wherein the impedance measurements also comprise a third impedance measurement. (google.ca)
- Ebrahim M, Hegde S, Printz B, Abcede M, Proudfoot JA, Davis C (2016) Evaluation of impedance cardiography for measurement of stroke volume in congenital heart disease. (springer.com)
- Impedance cardiography (ICG) is a non-invasive method of hemodynamic measurement, mostly known for estimation of stroke volume and cardiac output based on characteristic features of the signal. (uio.no)
- Bioelectricity (or bioelectromagnetism) relates to the study of biological electrical currents, and bioimpedance deals with the measurement of electrical conductivity. (worldcat.org)
- Validity of cardiac output measurement by computer-averaged impedance cardiography, and comparison with simultaneous thermodilution determinations. (semanticscholar.org)
- A number of techniques have been devised in recent years for the measurement of heart and lung volume of patients by the application to the thorax of the patient of an oscillating electrical current, and the measurement of the resulting voltages produced in the thorax across the organs of interest. (google.com)
- In a paper in Anesthesia (1983 Volume 38, pages 892-897), A.B. Baker and C. McLeod refer to the use of an oesophageal electrical probe for various measurements within the chest region, for example ECG, pacing, temperature, sound measurement, and pressure measurement. (google.com)
- Since the inception of impedance cardiography there has been an increase in the reliability of the technique and improvement in measurement of cardiac parameters [7Greenfield - 13Dilek]. (ukessays.com)
- These theoretical and experimental results could be widely used for the application of electrical method to clinical measurement and therapy. (nii.ac.jp)
- 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. (portlandpress.com)
- 5. Transthoracic impedance cardiography is a rapid, non-invasive technique for measurement of cardiac output. (portlandpress.com)
- The final section is an abbreviated summary of the 1994 National Institutes of Health (NIH) Technology Assessment Conference on Bioelectrical Impedance Analysis in Body Composition Measurement. (nap.edu)
- In this work, an eight-channel frontend was developed for contacting a 2×8 electrode array (8 measurement and 8 reference electrodes) with a large common electrode to the impedance gain-phase analyzer Solartron 1260 (S-1260). (sciendo.com)
- One of the non-invasive methods of monitoring changes in cardiovascular haemodynamics is the measurement of transthoracic impedance (TTI). (eajem.com)
- One of the non-invasive methods to monitor changes in cardiovascular haemodynamics is the measurement of transthoracic impedance cardiography (ICG). (eajem.com)
- Haemodynamic parameters are calculated from the impedance difference obtained after the measurement. (eajem.com)
- In this work, a real-time Android biofeedback application based on a Bluetooth enabled ECG and thoracic electrical bioimpedance (respiration) measurement device has been developed. (diva-portal.org)
- Experimental and numerical study on optimal spot-electrodes arrays in transthoracic electrical impedance cardiography. (biomedsearch.com)
- In our previous reports, we have confirmed that a thorax is nearly assumed as an electrical cylinder model when a pair of current injection spot-electrodes are placed far from the thorax like a placement of the forehead - left medial knee or the mastoid process - lower right abdomen, and that the changes in current distributions associated with cardiac blood ejection are roughly homogeneous around the medial line of the thorax. (biomedsearch.com)
- The present study concerns with determination of an optimal spot-electrodes array for voltage pick-up through the detailed measurements of pulsatile components of the thoracic impedance along the medial line of the thorax using an 11x2 channels impedance mapping system. (biomedsearch.com)
- Recording changes in electrical impedance between electrodes placed on opposite sides of a part of the body, as a measure of volume changes in the path of the current. (bioportfolio.com)
- A device is described for measuring electrical characteristics of biological tissues with plurality of electrodes and a processor controlling the stimulation. (patents.com)
- R. K. Kauppinen, J. A. Hyttinen and J. A. Malmivuo (1998) Sensitivity distributions of impedance cardiography using band and spot electrodes analyzed by a three-dimensional computer model. (springer.com)
- With the goal of finding novel biocompatible materials suitable to replace silver in the manufacturing of textile electrodes for medical applications of electrical bioimpedance spectroscopy, three different polymeric materials have been investigated. (diva-portal.org)
- Tetrapolar total right side electrical bioimpedance spectroscopy (EBIS) measurements have been performed with polymer and with standard gel electrodes. (diva-portal.org)
- This may be done by applying electrical signals via a first set of electrodes, and measuring the impedance via a second set of electrodes. (freepatentsonline.com)
- If an electric current is applied to the thorax and measurements of the potential difference between points within the thorax are made, then no reliable assumption can be made on the value of current flowing between these measuring electrodes. (google.com)
- There are multiple ways of monitoring hemodynamics through ICG of which Thoracic Electrical Bioimpedance (TEB) is a basic variant that involves placement of electrodes on the root of the neck and at the cartilaginous section at the lower end of the sternum which is not attached to any ribs. (ukessays.com)
- A tiny electrical charge (which cannot be felt) is introduced onto the skin of the chest, and electrodes placed on the neck and chest measure how well that charge can travel. (medibid.com)
- The electrodes transmit and detect electrical and impedance changes in the thorax. (deltexmedical.com)
- ICG is a method of non-invasively estimating SV and assessing haemodynamic status via ECG surface electrodes, using complex algorithms to convert changes in thoracic impedance into volume changes. (biomedcentral.com)
- The impedance baseline (Z0) is combined with an estimation of the shape/volume of the thorax, and L (length) or distance between electrodes to estimate thoracic fluid content (TFC). (physioflow.com)
- While multiple methods exist for estimating this body component, anthropometry and bioelectrical impedance analysis (BIA) are the most widely available in low- to middle-income countries. (sciendo.com)
- Transthoracic electrical impedance (or admittance) cardiography is a simple technique for the non-invasive and continuous monitoring of stroke volume or cardiac output by detecting the electrical impedance of a thorax which is roughly assumed to be a two-compartment coaxial cylindrical model composed of the aorta and its surrounding thoracic tissues. (biomedsearch.com)
- Bernstein DP, Henry IC, Banet MJ, Dittrich T (2012) Stroke volume obtained by electrical interrogation of the brachial artery: transbrachial electrical bioimpedance velocimetry. (springer.com)
- Cybulski, G.: Computer method for automatic determination of stroke volume using impedance cardiography signals. (springer.com)
- Cybulski, G., Szulc, M.J., Torbicki, A., Pasierski, T.: A comparison between impedance cardiography and two dimensional echocardiography methods for measurements of stroke volume (SV) and systolic time intervals (STI). (springer.com)
- The monitor assesses electrocardiogram and thoracic impedance changes to calculate stroke volume. (aacnjournals.org)
- In this paper a new non-invasive, operator-free, continuous ventricular stroke volume monitoring device (Hemodynamic Cardiac Profiler, HCP) is presented, that measures the average stroke volume (SV) for each period of 20 seconds, as well as ventricular volume-time curves for each cardiac cycle, using a new electric method (Ventricular Field Recognition) with six independent electrode pairs distributed over the frontal thoracic skin. (biomedcentral.com)
- Standard ICG filters out the respiratory component of the impedance signal but uses the impedance baseline in the equation to compute Stroke Volume (SV) and subsequently Cardiac Output (CO = SV X Heart Rate). (physioflow.com)
- Examples include electrodermal activity (EDA), cardiac impedance (stroke volume) and thoracic impedance (respiration). (alanmacy.com)
- 7. A method according to claim 6 , also including determining a third parameter of the patient's thorax, in addition to the two specific impedances of tissue of the lungs. (google.ca)
- With ICG, the placement of four dual disposable sensors on the neck and chest are used to transmit and detect electrical and impedance changes in the thorax, which are used to measure and calculate cardiodynamic parameters. (wikipedia.org)
- L. Wang and R. Patterson (1995) Multiple sources of the impedance cardiogram based on 3-D finite difference human thorax models. (springer.com)
- 2 . The method of claim 1 , in which the sensing includes detecting a change in a baseline thoracic impedance associated with fluid buildup in a portion of a thorax of the subject. (google.es)
- Luther, "Intraoperative cardiac output monitoring: Comparison of impedance cardiography and thermodilution," Journal of Cardiothoracic and Vascular Anesthesia, vol. (thefreedictionary.com)
- Thoracic impedance cardiography (ICG) is a non-invasive technique, but conflicting results concerning the validity and reliability of ICG have been reported, varying from satisfactory correlations [ 8 - 10 ] to poor correlations [ 11 , 12 ] in comparison to thermodilution CO measurements. (biomedcentral.com)
Whole-body Impedance Cardiography3
- It is based on the Whole-body Impedance Cardiography, a technology that was developed by NI Medical's scientists over years of research and development following by extensive testing and validation. (sandor.co.in)
- Volunteers ( n = 470) without medication with cardiovascular effects were examined using radial pulse wave analysis, whole-body impedance cardiography, and heart rate variability analysis. (biomedcentral.com)
- Whole-body impedance cardiography (ICGWB) has previously been shown to be a fast and operator-independent method to measure PWV, but the lack of reference values has limited its use in clinical practice. (tuni.fi)
High Definition Impedance Cardiography2
- Exciting new upgrades see the addition of " best-in-class" Pulse Pressure Waveform Analysis (PPWA) and High Definition Impedance Cardiography (HD-ICG) to the proven ODM Doppler flow-based platform. (deltexmedical.com)
- In yet another first, Deltex has added High Definition Impedance Cardiography (HD-ICG), a non-invasive central blood flow monitoring option for the awake patient. (deltexmedical.com)
- Calculation of cardiac hemodynamic parameters is based on accurate detection of feature points in impedance cardiogram. (bvsalud.org)
- Hypertension as a hemodynamic disease: the role of impedance cardiography in diagnostic, prognostic, and therapeutic decision making. (semanticscholar.org)
- Multiple searches were performed using the following keywords: non-invasive hemodynamic monitoring AND/OR non-invasive cardiac output monitoring AND/OR thoracic electrical bioimpedance AND/OR impedance cardiography AND/OR bioreactance AND/OR NICOM AND trauma. (biomedcentral.com)
- Cardiac output and concomitant hemodynamic data were recorded from 11th-13th week of gestation every 5th week as well as at two occasions post partum employing bioimpedance cardiography. (springer.com)
- K. R. Visser (1992) Electric conductivity of stationary and flowing human blood at low frequencies. (springer.com)
- In order to investigate the contribution of arterial radius and center-line velocity to the blood conductivity and electrical impedance of pulsatile flow in the human common carotid artery, we proposed three simplified mathematical models to describe the relationship between the center-line velocity, the arterial radius, and the blood conductivity. (springer.com)
- Moreover, the change in arterial radius contributed much more to the electrical impedance than the change in blood conductivity induced by the center-line velocity. (springer.com)
- These sensors monitor the electrical conductivity of the body-information that is converted into blood flow data and is displayed in real time on a monitoring screen. (federallabs.org)
- Serum and urinary NGAL were not associated with systemic arterial flow status as assessed by echocardiography and transthoracic impedance cardiography , pulmonary arterial systolic pressure, echocardiographic measures of LV and RV functions, and BNP. (thefreedictionary.com)
Ambulatory impedance cardiography3
- In this chapter it is described the problem of ambulatory impedance cardiography validation against the clinically accepted reference methods, basing on data from own research. (springer.com)
- It also contains the discussion of the motion artefacts in ambulatory impedance cardiography. (springer.com)
- Background: The reliability of ambulatory impedance cardiography has not been evaluated. (elsevier.com)
- Bioelectrical impedance spectroscopy (BIS) has been used in combination with the Cole model for monitoring body composition including fluid status. (sciendo.com)
- 1. Cardiac output measured by transthoracic impedance cardiography has been compared with simultaneous measurements made by the indirect Fick CO 2 rebreathing method in nine adults and 14 children. (portlandpress.com)
- Transthoracic BIS is sensitive to small variations in intrathoracic blood volume, in particular the resistances of fluid compartments and the geometric properties of the impedance arc. (sciendo.com)
Expected impedance measurements1
- 11. A method according to claim 10 , wherein calculating expected impedance measurements comprises using one or more of a finite element method, a finite difference method, a finite boundary element method, and a finite volume method. (google.ca)
- 7. The apparatus of claim 4 , wherein said first signals comprise an impedance waveform, said second signals comprise ECG signals, and said computer program is adapted to identify at least one fiducial point within each of said impedance waveform and said ECG signals. (google.com)
- 12. The apparatus of claim 3 , further comprising apparatus adapted to measure the difference in at least two of said first signals, said difference being compared to a first predetermined value to evaluate the electrical continuity of at least one of the electrical terminals associated with said first signal source. (google.com)
- According to these parameters , doctors can determine heart conditions, so it is very important to accurately detect the feature point of impedance differential signals. (bvsalud.org)
- Multielectrode arrays for measuring electrical signals or impedance require multichannel readout systems. (sciendo.com)
- Impedance cardiography is a non-invasive means of testing heart functioning that uses electrical impedance - the interference of electrical signals by liquids - to measure blood flow through the heart. (phoenixrising.me)
- 2) the advantage of RIC is the use of peripheral rather than thoracic impedance signals, supported by correcting factors. (ne.jp)
- Biopotentials are electrical signals (voltages) that are generated by physiological processes occurring within the body. (alanmacy.com)
- Impedance changes are sensed by applying external excitation signals that convert impedance to voltage. (alanmacy.com)
- We performed a retrospective analysis of 202 patients followed at our Hypertension Clinic with the diagnosis of primary HT and who performed an impedance cardiography (ICG) test. (springer.com)
- b) determining the specific impedance of tissue of at least a first one of the patient's lungs substantially independently of specific impedance of tissue of the second one of the patient's lungs, such that Poisson's equation for a model of the chest has a solution consistent with the at least two impedance measurements. (google.ca)
- 2. A method according to claim 1 , wherein the model of the chest treats the specific impedances of tissue of the two lungs as two independent variables. (google.ca)
- 12. A method according to claim 1 , wherein determining the specific impedance of tissue of at least one lung comprises determining the specific impedance of tissue of the lung responsive to a solution of equations that satisfy constraints defined by the first and second impedance measurements, for a model of the chest with two specific impedances of lung tissue as unknowns. (google.ca)
- This system works by injecting a constant, low-grade (1-4 mA) electrical current into the chest to sense change in thoracic electrical impedance that is associated with change in blood flow in the aorta during the cardiac cycle. (aacnjournals.org)
- A number of confounding variables (i.e. sex, chest size, percentage of fat, etc.) reduced impedance cardiography's reliability at one time. (phoenixrising.me)
- This allows one to accurately measure cardiac output by measuring the electrical impedence across the chest wall. (prohealth.com)
- The Bioreactance ® approach is based on the assumption that when blood flows out of the heart, phase shifts are created in alternating radiofrequency electrical currents applied across the patients chest wall. (physioflow.com)
- Chest wall configuration, another factor that could conceivably alter thoracic electrical bioimpedance measurements, likewise did not seem to alter the accuracy or reliability of impedance determination of Q. Although not formally tested in pediatric patients with other diseases characterized by airway obstruction such as asthma or bronchopulmonary dysplasia, one should have no reservations in generalizing findings in the present study to children with these disorders. (advances-in-medicine.net)
- For example, adipose tissue, bones, lungs and muscles are poor conductors of electricity while blood is a good conductor, and the blood flow and circulation result in a difference in chest impedance. (eajem.com)
- Heart rate, cardiac (CI) and stroke indexes were assessed by impedance cardiography while arterial blood pressures were assessed with a brachial sphygmomanometer. (clinical-practice-and-epidemiology-in-mental-health.com)
- Introduction Electric velocimetry (EV) is normally a kind of impedance cardiography, and it is a non-invasive and applicable approach to cardiac result monitoring continuously. (welbourneprimary.com)
- After several adjustments towards the algorithm [1-5], impedance cardiography (that's, electric velocimetry (EV)) gadgets have grown to be commercially available. (welbourneprimary.com)
- Electrical velocimetry suggests left ventricular failure as the etiology of sudden hypoxemia, rales and wheezing immediately after cesarean delivery under general anesthesia. (soap.org)
- We report a case of a parturient with von Willebrand's Disease, type 2b, undergoing cesarean section under general anesthesia, who developed sudden hypoxemia, diffuse rales and wheezing, in whom electrical velocimetry corroborated a diagnosis of sudden left ventricular failure due to increased venous return at delivery, exacerbated by prior iatrogenic fluid overload. (soap.org)
- Electrical velocimetry, a new impedance cardiography algorithm, demonstrated decreases in nominal stroke and cardiac indices during the hypoxemic episode, suggesting that the etiology may have been acute left ventricular failure. (soap.org)
- Electrical velocimetry is easy to apply and completely painless and non-invasive. (soap.org)
- The aim of the present study was to continuously assess haemodynamic changes during transition in term infants for the first time by using electrical velocimetry (EV), a new method of non-invasive cardiac output monitoring (NICOM), based on impedance cardiography technology. (portsaidneogrp.com)
- Objective tests of middle ear function based on the difficulty (impedance) or ease (admittance) of sound flow through the middle ear. (bioportfolio.com)
- P. M. de Vries, J. W. Langendijk and P. M. Kouw (1995) The influence of alternating current frequency on flow related admittance changes of blood: a concept for improvement of impedance cardiography. (springer.com)
- F. M. Liebman, J. Pearl and S. Bagno (1962) The electrical conductance properties of blood in motion. (springer.com)
- This technique is dependant on a big change in level of resistance through the cardiac routine to a transcutaneously used electric AC Rabbit polyclonal to BMPR2 voltage, and can be used to calculate still left ventricular stroke quantity (LVSV), and CO thus. (welbourneprimary.com)
- Automated impedance cardiography for detecting ischemic left ventricular dysfunction during exercise testing. (semanticscholar.org)
- In a preferred embodiment impedance measurements are obtained for determining the timing of right heart valve closure or right ventricular contractions, and the timing of delivery of left ventricular pace pulses is adjusted so as to optimally synchronize left ventricular pacing with the right ventricular contractions. (google.co.uk)
Baseline thoracic impedance2
Electrode polarization impedance1
- The influence of the electrode mismatch, stray capacitances and large electrode polarization impedance are unclear and they need to be clarified with further studies. (diva-portal.org)
- Hemodynamics is a fluidic counterpart to the Ohm's law in electronics: pressure is equivalent to voltage, flow to current, vascular resistance to electrical resistance and myocardial work to power. (wikipedia.org)
- Impedance means 'resistance'--so the test is measuring the resistance to conduction of the electrical charge. (medibid.com)
- Fluids conduct the electrical charge better, so the more fluid there is in the heart, blood vessels, and lungs, the less impedance (resistance) there is. (medibid.com)
- Total peripheral resistance (TPR) was determined from cardiac output derived by electrical impedance cardiography. (semanticscholar.org)
- A measure of impedance (Z) is composed of the sum of two vectors, resistance (R) and reactance (Xc), measured at a particular frequency and is described mathematically by the equation Z 2 = R 2 + Xc 2 . (nap.edu)
- Resistance is the opposition of a conductor to the alternating current, and as the electric current travels through the body, resistance is basically the same as in nonbiological conductors (Kay et al. (nap.edu)
- FIGURE 7-1 Impedance plot curve of resistance and reactance with frequency. (nap.edu)
- ICG™ measures the Baseline Impedance (Resistance or Z0) to this current together with variations induced by the respiration and the cardiac flow. (physioflow.com)
- Our measurements of thoracic fluid volume support occult volume expansion as a mediator of antihypertensive drug resistance and use of impedance measurements to guide advancing diuretic dose and adjustment of multidrug antihypertensive treatment. (ahajournals.org)
- The provision of guidance in ventilator therapy by continuous monitoring of regional lung ventilation, aeration and respiratory system mechanics is the main clinical benefit of electrical impedance to. (bioportfolio.com)
- Increased emphasis on bioelectricity and potential clinical applications* Two all new chapters dealing with electrical properties of passive and excitable tissue* Expanded discussion of finite element modelling and a broad range of applications* Provides a complete?all in one? (worldcat.org)
- However, we have only a few impedance method which is sufficient and is widely and reliably used in clinical field. (nii.ac.jp)
- Bioimpedance cardiography may provide additional outcome-relevant information early in pregnancy and may also be used as a predictive instrument for pregnancy-associated diseases. (springer.com)
- The assessment of cardiac parameters by bioimpedance cardiography could be performed at low costs without additional risks. (springer.com)
- Vocal tract shape estimation from speech signal, Enhancement of electrolaryngeal speech using spectral subtraction, Multi-band frequency compression for hearing-impaired, Speech enhancement by modification of stop consonant landmarks, Speech transformation using multivariate polynomial modeling, Cardiac output monitoring using impedance cardiography, Diagnostic information from impedance cardiography. (iitb.ac.in)
- stands for cardiac output in litres per minute and this can be measured using a totally non-invasive method called Impedence Cardiography. (prohealth.com)
- Impedance sensing is provided for between selected pairs of the four chambers, to enable optimizing of information for control and diagnosis. (google.co.uk)
- According to The Handbook of Modern Sensors: Physics, Designs and Applications, a sensor is defined as "a device that receives a stimulus and responds with an electrical signal. (element14.com)
- Method of detecting a loss of electrical continuity in one or more of the terminals of the electrode patch, and selecting between a plurality of signal inputs based on signal quality, are also disclosed. (google.com)
- As the impedance responses of these tissue parameters vary with frequencies of the applied signal, the impedance analysis conducted over a wide frequency band provides more information about the tissue interiors which help us to better understand the biological tissues anatomy, physiology, and pathology. (hindawi.com)
- After stabilising, using HD-Z signal filter technology, these electrical currents are then utilised to measure and calculate haemodynamic parameters. (deltexmedical.com)
- The sensed impedance signal (delta Z or dZ) is then processed and analyzed together with its derivative over time (dZ/dt) a mirror image of dP/dt. (physioflow.com)
- The pulsatile waveform is indeed the part of the impedance signal that is in motion in accordance with the blood flow generated by the heart. (physioflow.com)
- The impedance signal is of very low magnitude (1/1000 of the magnitude of an EKG signal) and therefore its sensitivity to interferences and artifacts is high. (physioflow.com)
- It is now possible to improve the stability and signal/noise ratio of impedance cardiography thanks to newly developed filtering techniques. (physioflow.com)
- SM-ICG™ uses a first level optimized input filter finely adapted to the high frequency current transmitted, so that the Impedance signal measured is mostly free from noise coming from other electronic or physiologic emitters. (physioflow.com)
- Amplifies the electrical signal resulting from stomach and intestinal smooth muscle activity. (alanmacy.com)
- In one embodiment, the apparatus comprises a constant current source impedance cardiography (ICG) monitor adapted as a stand-alone system. (google.com)
- An apparatus for monitoring the tumescent state of the penis of a patient includes a plurality of sensing elements to be placed in proximity to the penis for sensing penile impedance values. (justia.com)
- According to one embodiment, cardiac-signature data is determined using the penile impedance values, and the apparatus indicates periods of erectile activity using the cardiac-signature data. (justia.com)
- We acquired BIS data before, during and after compression of the legs and examined the effect of thoracic fluid variations on parameters derived based on the Cole model and on geometrical properties of the impedance arc. (sciendo.com)
- The system utilizes impedance sensing for determining optimum pacing parameters, e.g., for pacing the left ventricle so that left. (google.co.uk)
Journal of Electrical Bioimpedance1
- Journal of Electrical Bioimpedance. (uio.no)
- To compare the performances of the TIC and RIC algorithms, the raw data of peripheral impedance changes yielded by RIC in 43 cardiac patients were used here for software processing and calculating the CO with the TIC algorithm. (ne.jp)
- The highly effective, easy to follow organization has been retained, with new discussion of state-of-the-art advances in finite element analysis, endogenic sources, control theory, tissue electrical properties, and invasive measurements. (worldcat.org)
- Cybulski, G.: Dynamic impedance cardiography--the system and its applications. (springer.com)
- Launch TC-DAPK6 supplier In the 1960s, impedance cardiography originated to monitor cardiac result (CO) . (welbourneprimary.com)
- These include static impedance and dynamic impedance (i.e., tympanometry and impedance tests in conjunction with intra-aural muscle reflex elicitation). (bioportfolio.com)
- The detected static impedance indicates thoracic fluid volume, while the dynamic impedance is affected by aortic blood volume and velocity. (eajem.com)
- b) using the impedance measurements to determine the impedance of at least one of the lungs substantially independently of impedance of the other lung. (google.ca)
- 5. A method according to claim 1 , wherein determining the specific impedance of tissue of at least one lung comprises determining the specific impedances of tissue of both lungs. (google.ca)
- 9. A method according to claim 6 , wherein a least squares method is used to find a fit of the two specific impedances of tissue of the lungs to the at least three impedance measurements. (google.ca)
- Impedance cardiography (ICG), also known as thoracic electrical bioimpedance (TEB) - a non-invasive method of measuring changes in blood flow in the heart and lungs over time. (atlantichealth.org)
- Electrocardiogram, impedance cardiography, beat-to-beat blood pressure and electroencephalography were measured simultaneously and continuously during the experiments. (biomedcentral.com)
- One of the most interesting applications of impedance method is the estimation of fluid distribution in the body. (nii.ac.jp)
- In this research, we theoretically discussed the electrical properties of cell suspension, and we could accurately measure the intra- and extra-cellular fluid distribution. (nii.ac.jp)
- Publications] Katsayuki Sakamoto: 'Study of the Relation between Fluid Distribution change and Impedance Change 'Annals of the NY Academy of Sciences. (nii.ac.jp)
- and determining an indicator using the at least one impedance value, the indicator being indicative of extracellular fluid levels in the at least one leg segment and being used in the assessment of venous insufficiency. (patentsencyclopedia.com)
- 5) A method according to claim 1, wherein the method includes, in a processing system, determining an index using the at least one impedance value, the index being indicative of a ratio of extracellular to intracellular fluid levels in the at least leg segment, the index being used in the assessment of venous insufficiency. (patentsencyclopedia.com)
- The inverse of the basal thoracic impedance relative to impact can give the amount of intrathoracic fluid. (eajem.com)
- The impedance of an electrolytic dilution series was measured and compared to the theoretical values. (sciendo.com)
- and cardiac output, CO] were continuously recorded using an impedance cardiography device (PhysioFlow[R] PF07 Enduro[TM], USA). (thefreedictionary.com)
- Gaw RL, Cornish BH, Thomas BJ (2007) Comparison of a theoretical impedance model with experimental measurements of pulsatile blood flow. (springer.com)
- Gaw RL, Cornish BH, Thomas BJ (2008) The electrical impedance of pulsatile blood flowing through rigid tubes: a theoretical investigation. (springer.com)
- Small fluctuations present in an Impedance Cardiogram are often dismissed as noise, but may be due to unknown physiological origins. (springer.com)
- The phase angle (see Figure 7-1 ), which has been found to be important for describing relationships between bioelectrical impedance and the body and for measuring physiological variables (Baumgartner et al. (nap.edu)
- Another class of indirectly generated biopotentials include those in which the physiological process acts to modulate light energy, versus electrical energy. (alanmacy.com)
- and, b) determining an indicator using the change impedance, the indicator being indicative of an ejection volume to allow assessment of CMP function. (freepatentsonline.com)
- Thoracic impedance cardiography (ICG) allows continuous, non-invasive SV assessment. (biomedcentral.com)
- Cole Parameter Estimation from the Modulus of the Electrical Bioimpeadance for Assessment of Body Composition. (uio.no)
- The major focus has been centered on tests evaluating the perfusion of the heart with imaging techniques or detecting alterations in electrical or mechanical function of the heart. (biomedsearch.com)
- Acoustic cardiography - a non-invasive technology that enables clinicians to integrate heart sounds and echocardiogram data to measure heart function and blood flow. (atlantichealth.org)
- Beyond the four quadrants: The critical and emerging role of impedance cardiography in heart failure. (thefreedictionary.com)
- The recording and study of the electrical activity of the heart. (thefreedictionary.com)
- Beyond the Four Quadrants: The Critical and Emergong Role of Impedance Cardiography in Heart Failure. (sandor.co.in)
- Amplifies electrical activity generated by the heart and will reliably record ECG from humans, animals and isolated organ preparations. (alanmacy.com)
- The impedance sensing also is used for determination of arrhythmias or progression of heart failure. (google.co.uk)
- Impedance sensing in the left heart also provides timing of mechanical contraction, and the pacemaker controls pacing to maintain bi-ventricular mechanical synchronization adjusted for maximum cardiac output. (google.co.uk)
- CardioDynamics International Corporation (CDIC) has created the BioZR System through a Small Business Innovation Research (SBIR) award from Johnson Space Center, providing patients and physicians with a cost-effective and highly accurate monitoring system.The BioZ non-invasive heart monitor is based on a technology known as Impedance Cardiography (ICG). (federallabs.org)
- The heart relies on an organized sequence of electrical impulses in order to beat effectively. (google.ca)