Cardiography impedance. Medical search

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.

The resistance to the flow of either alternating or direct electrical current.

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. (Stedman, 25th ed)

The volume of BLOOD passing through the HEART per unit of time. It is usually expressed as liters (volume) per minute so as not to be confused with STROKE VOLUME (volume per beat).

1,4:3,6-Dianhydro D-glucitol. Chemically inert osmotic diuretic used mainly to treat hydrocephalus; also used in glaucoma.

The region of the thorax that includes the PLEURAL CAVITY and MEDIASTINUM.

Act of listening for sounds within the heart.

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.

The amount of BLOOD pumped out of the HEART per beat, not to be confused with cardiac output (volume/time). It is calculated as the difference between the end-diastolic volume and the end-systolic volume.

The movement and the forces involved in the movement of the blood through the CARDIOVASCULAR SYSTEM.

The graphic recording of chest wall movement due to cardiac impulses.

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.

The force that opposes the flow of BLOOD through a vascular bed. It is equal to the difference in BLOOD PRESSURE across the vascular bed divided by the CARDIAC OUTPUT.

The number of times the HEART VENTRICLES contract per unit of time, usually per minute.

The continuous measurement of physiological processes, blood pressure, heart rate, renal output, reflexes, respiration, etc., in a patient or experimental animal; includes pharmacologic monitoring, the measurement of administered drugs or their metabolites in the blood, tissues, or urine.

PRESSURE of the BLOOD on the ARTERIES and other BLOOD VESSELS.

The statistical reproducibility of measurements (often in a clinical context), including the testing of instrumentation or techniques to obtain reproducible results. The concept includes reproducibility of physiological measurements, which may be used to develop rules to assess probability or prognosis, or response to a stimulus; reproducibility of occurrence of a condition; and reproducibility of experimental results.

A heterogeneous condition in which the heart is unable to pump out sufficient blood to meet the metabolic need of the body. Heart failure can be caused by structural defects, functional abnormalities (VENTRICULAR DYSFUNCTION), or a sudden overload beyond its capacity. Chronic heart failure is more common than acute heart failure which results from sudden insult to cardiac function, such as MYOCARDIAL INFARCTION.

Physical activity which is usually regular and done with the intention of improving or maintaining PHYSICAL FITNESS or HEALTH. Contrast with PHYSICAL EXERTION which is concerned largely with the physiologic and metabolic response to energy expenditure.

Recording of the moment-to-moment electromotive forces of the HEART as projected onto various sites on the body's surface, delineated as a scalar function of time. The recording is monitored by a tracing on slow moving chart paper or by observing it on a cardioscope, which is a CATHODE RAY TUBE DISPLAY.

Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)

Methods or programs of physical activities which can be used to promote, maintain, or restore the physical and physiological well-being of an individual.

Abnormally low BLOOD PRESSURE that can result in inadequate blood flow to the brain and other vital organs. Common symptom is DIZZINESS but greater negative impacts on the body occur when there is prolonged depravation of oxygen and nutrients.

The combination of hemodialysis and hemofiltration either simultaneously or sequentially. Convective transport (hemofiltration) may be better for removal of larger molecular weight substances and diffusive transport (hemodialysis) for smaller molecular weight solutes.

Therapy for the insufficient cleansing of the BLOOD by the kidneys based on dialysis and including hemodialysis, PERITONEAL DIALYSIS, and HEMODIAFILTRATION.

The end-stage of CHRONIC RENAL INSUFFICIENCY. It is characterized by the severe irreversible kidney damage (as measured by the level of PROTEINURIA) and the reduction in GLOMERULAR FILTRATION RATE to less than 15 ml per min (Kidney Foundation: Kidney Disease Outcome Quality Initiative, 2002). These patients generally require HEMODIALYSIS or KIDNEY TRANSPLANTATION.

Imaging methods that result in sharp images of objects located on a chosen plane and blurred images located above or below the plane.

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)

Ultrasonic recording of the size, motion, and composition of the heart and surrounding tissues. The standard approach is transthoracic.

The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH.

Ultrasonic recording of the size, motion, and composition of the heart and surrounding tissues using a transducer placed in the esophagus.

Measurement of intracardiac blood flow using an M-mode and/or two-dimensional (2-D) echocardiogram while simultaneously recording the spectrum of the audible Doppler signal (e.g., velocity, direction, amplitude, intensity, timing) reflected from the moving column of red blood cells.

Echocardiography amplified by the addition of depth to the conventional two-dimensional ECHOCARDIOGRAPHY visualizing only the length and width of the heart. Three-dimensional ultrasound imaging was first described in 1961 but its application to echocardiography did not take place until 1974. (Mayo Clin Proc 1993;68:221-40)

Composition of images of EARTH or other planets from data collected during SPACE FLIGHT by remote sensing instruments onboard SPACECRAFT. The satellite sensor systems measure and record absorbed, emitted, or reflected energy across the spectra, as well as global position and time.

Any visible result of a procedure which is caused by the procedure itself and not by the entity being analyzed. Common examples include histological structures introduced by tissue processing, radiographic images of structures that are not naturally present in living tissue, and products of chemical reactions that occur during analysis.

A principle of estimation in which the estimates of a set of parameters in a statistical model are those quantities minimizing the sum of squared differences between the observed values of a dependent variable and the values predicted by the model.

A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task.

Controlled physical activity which is performed in order to allow assessment of physiological functions, particularly cardiovascular and pulmonary, but also aerobic capacity. Maximal (most intense) exercise is usually required but submaximal exercise is also used.

The rate at which oxygen is used by a tissue; microliters of oxygen STPD used per milligram of tissue per hour; the rate at which oxygen enters the blood from alveolar gas, equal in the steady state to the consumption of oxygen by tissue metabolism throughout the body. (Stedman, 25th ed, p346)

Randomised comparison of electrode positions for cardioversion of atrial fibrillation. (1/174)

OBJECTIVE: To compare the relative efficacy of anteroanterior v anteroposterior electrode pad positions for external cardioversion of atrial fibrillation. DESIGN: Prospective randomised trial. SETTING: Tertiary referral cardiology centre in the United Kingdom. PATIENTS: 90 patients undergoing elective cardioversion for atrial fibrillation. INTERVENTIONS: Cardioversion was attempted with self adhesive electrode pads with an area of 106 cm2 placed either in the anteroanterior (AA) or anteroposterior (AP) positions. Initial shock was 100 J which, if unsuccessful, was followed by 200 J, 300 J, and 360 J if required. Peak current and transthoracic impedance were measured. MAIN OUTCOME MEASURES: Cardioversion success rate and energy requirements. RESULTS: Cardioversion was successful in 81% of the patients (73/90). There was no statistically significant difference in the cardioversion success rate (AA 84%, 38/45 patients; AP 78%, 35/45 patients; p = 0.42) or mean (SD) energy requirement for all patients (AA 223 (96.1) J; AP 232 (110) J) or for patients who were successfully cardioverted (AA 197.9 (82.4) J; AP 195.4 (97.2) J; p = 0.9) between the two pad positions. The mean transthoracic impedance (TTI) for the first shock (AA 77.5 (18.4) ohms; AP 73.7 (18.7) ohms; p = 0.34) was not significantly different between the two groups. TTI correlated significantly with body mass index, percentage body fat, and chest AP diameter. There was a progressive decrease in TTI with serial shocks. While aetiology and TTI were the two independent significant predictive factors for energy requirement, duration of atrial fibrillation was the only independent predictor of cardioversion success in a multivariate analysis. CONCLUSIONS: Electrode pad position is not a determinant of cardioversion success rate or energy requirement. (+info)

Cyclic changes in right ventricular output impedance during mechanical ventilation. (2/174)

In a context such as acute respiratory distress syndrome, where optimum tidal volume and airway pressure levels are debated, the present study was designed to differentiate the right ventricular (RV) consequences of increasing lung volume from those secondary to increasing airway pressure during tidal ventilation. The study was conducted by combined two-dimensional echocardiographic and Doppler studies in 10 patients requiring mechanical ventilation in the controlled mode because of acute respiratory failure. Continuous monitoring of airway pressure on echocardiographic and Doppler recordings provided accurate timing of each cardiac event during the respiratory cycle, with particular attention being paid to end-expiratory and end-inspiratory atrial diameters, RV dimensions, and pulmonary artery and tricuspid flow estimated by the velocity-time integral (PA(VTI) and T(VTI), respectively). At baseline, lung inflation during the inspiratory phase of mechanical ventilation produced a drop in PA(VTI) from 14.3 +/- 2.6 cm at end expiration to 11.3 +/- 2.1 cm at end inspiration. This drop occurred without reduction in right atrial diameter or in RV diastolic dimensions. It was not preceded but was followed by a decrease in T(VTI), thus confirming an increase in RV outflow impedance. Manipulation of tidal volume without changing airway pressure and manipulation of airway pressure without changing tidal volume demonstrated that tidal volume, but not airway pressure, was the main determinant factor of RV afterloading during mechanical ventilation. (+info)

Three-dimensional endocardial impedance mapping: a new approach for myocardial infarction assessment. (3/174)

Precise identification of infarcted myocardial tissue is of importance in diagnostic and interventional cardiology. A three-dimensional, catheter-based endocardial electromechanical mapping technique was used to assess the ability of local endocardial impedance in delineating the exact location, size, and border of canine myocardial infarction. Electromechanical mapping of the left ventricle was performed in a control group (n = 10) and 4 wk after left anterior descending coronary artery ligation (n = 10). Impedance, bipolar electrogram amplitude, and endocardial local shortening (LS) were quantified. The infarcted area was compared with the corresponding regions in controls, revealing a significant reduction in impedance values [infarcted vs. controls: 168.8 +/- 11. 7 and 240.7 +/- 22.3 Omega, respectively (means +/- SE), P < 0.05] bipolar electrogram amplitude (1.8 +/- 0.2 mV, 4.4 +/- 0.7 mV, P < 0. 05), and LS (-2.36 +/- 1.6%, 11.9 +/- 0.9%, P < 0.05). The accuracy of the impedance maps in delineating the location and extent of the infarcted region was demonstrated by the high correlation with the infarct area (Pearson's correlation coefficient = 0.942) and the accurate identification of the infarct borders in pathology. By accurately defining myocardial infarction and its borders, endocardial impedance mapping may become a clinically useful tool in differentiating healthy from necrotic myocardial tissue. (+info)

Relations of stroke volume and cardiac output to body composition: the strong heart study. (4/174)

BACKGROUND: Although cardiac output (CO) plays the vital role of delivering nutrients to body tissues, few data are available concerning the relations of stroke volume (SV) and CO to body composition in large population samples. METHODS AND RESULTS: Doppler and 2D echocardiography and bioelectric impedance in 2744 Strong Heart Study participants were used to calculate SV and CO and to relate them to fat-free body mass (FFM), adipose mass, and demographic variables. Both SV and CO were higher in men than women and in overweight than normal-weight individuals, but these differences were diminished or even reversed by normalization for FFM or body surface area. In both sexes, SV and CO were more strongly related to FFM than adipose mass, other body habitus measures, arterial pressure, diabetes, or age. In multivariate analyses using the average of Doppler and left ventricular SV to minimize measurement variability, FFM was the strongest correlate of SV and CO; other independent correlates were adipose mass, systolic pressure, diabetes, age, and use of digoxin and calcium channel and beta-blockers. CONCLUSIONS: In a population-based sample, SV and CO are more strongly related to FFM than other variables; increased FFM may be the primary determinant of increased SV and CO in obesity. (+info)

Ventricular afterload and ventricular work in fontan circulation: comparison with normal two-ventricle circulation and single-ventricle circulation with blalock-taussig shunts. (5/174)

BACKGROUND: Recent studies have indicated that there are inherent limitations associated with Fontan physiology. However, there have been no quantitative analyses of the effects of right heart bypass on ventricular afterload, hydraulic power, and resultant overall hemodynamics. Methods and Results- During routine cardiac catheterization, aortic impedance and ventricular hydraulic power were determined, both at rest and under increased ventricular work induced by dobutamine, in 17 patients with Fontan circulation, 15 patients with a single ventricle whose pulmonary circulation was maintained only by Blalock-Taussig shunts, and 13 patients who had normal 2-ventricle circulation. Both vascular resistance (nonpulsatile load on the ventricle) and pulsatile components of ventricular afterload (represented by low-frequency impedance) were significantly higher in the Fontan group than in the other groups (P<0.01), and this was associated with decreased cardiac output in the Fontan patients. In addition, hydraulic power cost per unit forward flow was 40% lower in the 2-ventricle circulation than in the single-ventricle circulation, suggesting lower ventricular efficiency in single-ventricle circulation attributable to the lack of a pulmonary ventricle. Furthermore, in the Fontan group, beta-adrenergic reserve was markedly decreased because of a limited preload reserve. CONCLUSIONS: Fontan physiology is associated with disadvantageous ventricular power and afterload profiles and has limited ventricular reserve capacity. Thus, to improve the long-term prognosis of patients after Fontan surgery, future research should be conducted into medical interventions that can overcome these limitations inherent in Fontan circulation. (+info)

Endocardial and epicardial steroid lead pacing in the neonatal and paediatric age group. (6/174)

AIM: To compare the performance of steroid eluting epicardial and endocardial leads in infants and children requiring permanent pacing. METHODS: Evaluation of pacing and sensing characteristics, impedances, and longevity of 159 steroid eluting leads implanted in 95 children. Group A consisted of 24 children weighing less than 15 kg with 15 endocardial leads (five atrial, 10 ventricular) and 19 epicardial leads (five atrial, 14 ventricular). Group B consisted of 71 children weighing more than 15 kg with 106 endocardial leads (56 atrial, 58 ventricular) and 19 epicardial leads (nine atrial, 10 ventricular). RESULTS: Group A: Stimulation thresholds were lower for ventricular endocardial leads at implant (mean (SD) 0.84 (0.54) v 1.59 (0.64) V, p < 0.014) and at two year follow up (ventricular 0.64 (0.24) v 1.65 (0.69) V, p < 0.003). Impedance and sensing thresholds did not differ significantly at implant and follow up. Group B: Stimulation thresholds were lower for ventricular endocardial leads at implant (0.72 (0.48) v 1.48 (0.58) V, p < 0.001) and at follow up (0.88 (0.46) v 1.55 (0.96) V, p < 0.009). Impedance did not differ. Sensing thresholds were also better for ventricular endocardial leads at follow up (9.1 (5.2) v 14.2 (6.4) mV, p < 0.02). Complications requiring intervention occurred in both groups (n = 7 for endocardial v n = 18 for epicardial leads). CONCLUSIONS: Endocardial and epicardial steroid eluting leads have comparable performance in the paediatric population. (+info)

Changes in the transthoracic impedance signal predict the outcome of a 70 degrees head-up tilt test. (7/174)

We determined whether early changes in central haemodynamics, as determined by transthoracic impedance, induced by a 70 degrees head-up tilt (HUT) test could predict syncope. Heart rate, arterial blood pressure and central haemodynamics [pre-ejection period and rapid left ventricular ejection time ( T (1)), slow ejection time ( T (2)) and d Z /d t (max) (where Z is thoracic impedance), assessed by the transthoracic impedance technique], were recorded during supine rest and during a 45 min 70 degrees HUT test in 68 patients (40+/-2 years) with a history of unexplained recurrent syncope. We found that 38 patients (42+/-3 years) had a symptomatic outcome to 70 degrees HUT (fainters) and 30 (39+/-2 years) had a negative outcome (non-fainters). When measured between 5 and 10 min of 70 degrees HUT, T (2) had increased significantly only in the fainters, and a change in T (2) of >40 ms from baseline predicted a positive outcome with a sensitivity of 68% and a specificity of 70%. During supine rest prior to 70 degrees HUT, the fainters exhibited a shorter T (2) than non-fainters (183+/-10 compared with 233+/-14 ms; P <0.01), and a T (2) of <199 ms predicted a positive outcome to 70 degrees HUT with a sensitivity of 68% and a specificity of 63%. Incorporation of the changes that occurred from rest to 70 degrees HUT in other haemodynamic variables (heart rate >11 beats/min, systolic pressure <2 mmHg, diastolic pressure <7 mmHg and pulse pressure <-3 mmHg) increased the specificity to 97% and the positive predictive value to 93%. Thus transthoracic impedance could detect differences in central haemodynamics between fainters and non-fainters during supine rest and during the initial period of 70 degrees HUT with a consistent sensitivity and specificity when combined with peripheral haemodynamic variables. (+info)

Respiratory sinus arrhythmia during speech production. (8/174)

The amplitude of the respiratory sinus arrhythmia (RSA) was investigated during a reading aloud task to determine whether alterations in respiratory control during speech production affect the amplitude of RSA. Changes in RSA amplitude associated with speech were evaluated by comparing RSA amplitudes during reading aloud with those obtained during rest breathing. A third condition, silent reading, was included to control for potentially confounding effects of cardiovascular responses to cognitive processes involved in the process of reading. Calibrated respiratory kinematics, electrocardiograms (ECGs), and speech audio signals were recorded from 18 adults (9 men, 9 women) during 5-min trials of each condition. The results indicated that the increases in respiratory duration, lung volume, and inspiratory velocity associated with reading aloud were accompanied by similar increases in the amplitude of RSA. This finding provides support for the premise that sensorimotor pathways mediating metabolic respiration are actively modulated during speech production. (+info)

The Impedance Cardiography (ICG or Ztot) signal represents the changes of the thoracic impedance due to variations in the blood ... 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 ... Several authors advocate the high reliability and good correlation of cardiography impedance compared to others techniques more ...

https://en.wikipedia.org/wiki/Quantium_Medical_Cardiac_Output

Impedance cardiography (often abbreviated as ICG, or Thoracic Electrical Bioimpedance (TEB)) measures changes in 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 ... Wang DJ, Gottlieb SS (September 2006). "Impedance cardiography: more questions than answers". Current Heart Failure Reports. 3 ...

https://en.wikipedia.org/wiki/Cardiac_output

The principles behind the device Perl designed for this project became the foundation for impedance cardiography. This work ...

https://en.wikipedia.org/wiki/Edward_Perl

"B-type natriuretic peptide and impedance cardiography at the time of routine echocardiography predict subsequent heart failure ... "Diagnostic ability of B-type natriuretic peptide and impedance cardiography: testing to identify left ventricular dysfunction ...

https://en.wikipedia.org/wiki/Ventricular_natriuretic_peptide

Impedance cardiography is a method of non-invasively monitoring hemodynamics, through the use of 4 dual sensors placed on the ... base impedance), ΔZR are the changes of impedance due to the respiratory cycle, and ΔZC 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 ... The Impedance Cardiography model contributes the rapid change of bioimpedance which occurs shortly after aortic valve opening ...

https://en.wikipedia.org/wiki/Electrical_cardiometry

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 ... Already in 1981, Judy did a study showing that the transthoracic electrical impedance method for measuring cardiac output in ... Judy was introduced to the bioelectrical impedance method as a noninvasive means of measuring stroke volume and cardiac output ...

https://en.wikipedia.org/wiki/William_V._Judy

... and/or impedance cardiography (ICG). Furthermore, there are no current cures for pulmonary arterial hypertension, but there are ...

https://en.wikipedia.org/wiki/Haemodynamic_response

... where blood flow velocity was compared to total body cardiac output as determined by impedance cardiography. Two rhesus ...

https://en.wikipedia.org/wiki/Kosmos_1667

... 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 ... Webster, J. G. (ed.), Electrical impedance tomography, Adam Hilger, Bristol, England, 1990. Webster, J. G. (ed.), Teaching ... J.G. (1978) "An Impedance Camera for Spatially Specific Measurements of the Thorax". IEEE Trans. Biomed. Eng. 25: 250-254.. ...

https://en.wikipedia.org/wiki/John_G._Webster

... recorded via impedance cardiography. These measures are beneficial because they provide accurate and perceiver-independent ...

https://en.wikipedia.org/wiki/Psychophysiology

... may refer to ICG Communications Illinois Central Gulf Railroad Impedance cardiography, a hemorheology technique for ...

https://en.wikipedia.org/wiki/ICG

... impedance MeSH E01.370.370.610.610.200 - cardiography, impedance MeSH E01.370.370.750 - tilt-table test MeSH E01.370.372.200 - ... impedance MeSH E01.370.610.610.200 - cardiography, impedance MeSH E01.370.610.615 - plethysmography, whole body MeSH E01.370. ... cardiography, impedance MeSH E01.370.370.380.170 - cardiotocography MeSH E01.370.370.380.200 - coronary angiography MeSH ... acoustic impedance tests MeSH E01.370.382.375.060 - audiometry MeSH E01.370.382.375.060.050 - audiometry, evoked response MeSH ...

https://en.wikipedia.org/wiki/List_of_MeSH_codes_(E01)

... 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 ... a calibrated reference impedance is adjusted to balance off the effect of the impedance of the device under test. Impedance ... In Cartesian form, impedance is defined as Z = R + j X {\displaystyle \ Z=R+jX} where the real part of impedance is the ...

https://en.wikipedia.org/wiki/Electrical_impedance

... (ICG), also referred to as electrical impedance plethysmography (EIP) or Thoracic Electrical ... The use of impedance cardiography in psychophysiological research was pioneered by the publication of an article by Miller and ... Impedance cardiography (ICG) is a non-invasive technology measuring total electrical conductivity of the thorax and its changes ... Kamath SA, Drazner MH, Tasissa G, Rogers JG, Stevenson LW, Yancy CW (August 2009). "Correlation of impedance cardiography with ...

https://en.wikipedia.org/wiki/Impedance_cardiography

Impedance cardiography. *Photoplethysmograph. *Windkessel effect. Notes and references[edit]. *^ a b Tortora, Gerard J.; ...

https://en.wikipedia.org/wiki/Haemodynamics

Once the catheter is in and all preparations are complete elsewhere in the lab, the EP study begins. The two large magnets are brought in on either side of the patient. They are large and looming and will sandwich the patient, but are able to precisely control the position of the electrodes that are on the end of the catheters. The X-ray machine will give the doctor a view of the heart and the position of the electrodes, and the magnets will allow the doctor to guide the electrodes through the heart. The magnets are controlled with either a joystick or game controller. The electrophysiologist begins by moving the electrodes along the conduction pathways and along the inner walls of the heart, measuring the electrical activity along the way. The next step is pacing the heart, this means he/she will speed up or slow down the heart by placing the electrode at certain points along the conductive pathways of the heart and control the depolarization rate of the heart. The doctor will pace each chamber ...

https://en.wikipedia.org/wiki/Electrophysiology_study

One of the first mentions of the possibility of heart transplantation was by American medical researcher Simon Flexner, who declared in a reading of his paper on "Tendencies in Pathology" in the University of Chicago in 1907 that it would be possible in the then-future for diseased human organs substitution for healthy ones by surgery - including arteries, stomach, kidneys and heart.[4] Not having a human donor heart available, James D. Hardy of the University of Mississippi Medical Center transplanted the heart of a chimpanzee into the chest of a dying Boyd Rush in the early morning of Jan. 24, 1964. Hardy used a defibrillator to shock the heart to restart beating. This heart did beat in Rush's chest for 60 to 90 minutes (sources differ), and then Rush died without regaining consciousness.[5][6][7] Although Hardy was a respected surgeon who had performed the world's first human-to-human lung transplant a year earlier,[8][9] author Donald McRae states that Hardy could feel the "icy disdain" from ...

https://en.wikipedia.org/wiki/Heart_transplantation

In 1923 Dr. Elliott Cutler of the Peter Bent Brigham Hospital performed the world's first successful heart valve surgery - a mitral valve repair. The patient was a 12-year-old girl with rheumatic mitral stenosis.. The development of the heart-lung machine in the 1950s paved the way for replacement of the mitral valve with an artificial valve in the 1960s. For decades after, mitral valve replacement was the only surgical option for patients with a severely diseased mitral valve. However, there are some significant downsides to a prosthetic mitral valve. Infection of the valve can occur, which is dangerous and difficult to treat. Patients with mechanical heart valves are required to take blood thinners for the rest of their lives, which presents a risk of bleeding complications. The artificial mitral valve has an elevated risk of stroke. Patients with mechanical heart valves who use warfarin for anticoagulation have to be on long-term anticoagulation therapy. This means they must go to the clinic ...

https://en.wikipedia.org/wiki/Mitral_valve_repair

The Mustard procedure was largely replaced in the late 1980s by the Jatene procedure (arterial switch), in which the native arteries were switched back to normal flow, so that the RV (right ventricle) would be connected to the pulmonary artery and the LV (left ventricle) would be connected to the aorta. This surgery had not been possible prior to 1975 because of difficulty with re-implanting coronary arteries which perfuse the actual heart muscle itself (myocardium), and even after it was first performed the excellent results from the Mustard operation meant that it was a long time before the Jatene procedure took over. ...

https://en.wikipedia.org/wiki/Mustard_procedure

Impedance-pH monitoring. *Esophageal pH monitoring. *Esophageal motility study. Stomach. *Bariatric surgery *Adjustable gastric ...

https://en.wikipedia.org/wiki/Resection_

The size of the recorder differs depending on the manufacturer of the device. The average dimensions of today's Holter monitors are about 110x70x30 mm but some are only 61x46x20 mm and weigh 99 g. [6] Most of the devices operate with two AA batteries. In case the batteries are depleted, some Holters allow their replacement even during monitoring. Most of the Holters monitor the ECG via only two or three channels (Note: depending on manufacturer, different counts of leads and lead systems are used). Today's trend is to minimize the number of leads to ensure the patient's comfort during recording. Although two/three channel recording has been used for a long time in the Holter monitoring history, as mentioned above, 12 channel Holters have recently appeared. These systems use the classic Mason-Likar lead system, i.e. producing a signal in the same format as during the common rest ECG and/or stress test measurement. These Holters can occasionally provide information similar to that of a ECG stress ...

https://en.wikipedia.org/wiki/Holter_monitor

Open heart surgery is a procedure in which the patient's heart is opened and surgery is performed on the internal structures of the heart. It was discovered by Wilfred G. Bigelow of the University of Toronto that the repair of intracardiac pathologies was better done with a bloodless and motionless environment, which means that the heart should be stopped and drained of blood. The first successful intracardiac correction of a congenital heart defect using hypothermia was performed by C. Walton Lillehei and F. John Lewis at the University of Minnesota on September 2, 1952. The following year, Soviet surgeon Aleksandr Aleksandrovich Vishnevskiy conducted the first cardiac surgery under local anesthesia.. Surgeons realized the limitations of hypothermia - complex intracardiac repairs take more time and the patient needs blood flow to the body, particularly to the brain. The patient needs the function of the heart and lungs provided by an artificial method, hence the term cardiopulmonary bypass. ...

https://en.wikipedia.org/wiki/Cardiac_surgeon

Radiofrequency energy is used in heart tissue or normal parts to destroy abnormal electrical pathways that are contributing to a cardiac arrhythmia. It is used in recurrent atrial flutter (Afl), atrial fibrillation (AF), supraventricular tachycardia (SVT), atrial tachycardia, Multifocal Atrial Tachycardia (MAT) and some types of ventricular arrhythmia. The energy-emitting probe (electrode) is at the tip of a catheter which is placed into the heart, usually through a vein. This catheter is called the ablator. The practitioner first "maps" an area of the heart to locate the abnormal electrical activity (electrophysiology study) before the responsible tissue is eliminated. Ablation is now the standard treatment for SVT and typical atrial flutter and the technique can also be used in AF, either to block the atrioventricular node after implantation of a pacemaker or to block conduction within the left atrium, especially around the pulmonary veins. In some conditions, especially forms of intra-nodal ...

https://en.wikipedia.org/wiki/Facet_rhizotomy

The majority of atrial septostomies are performed on infants with d-TGA or other cyanotic heart defects. In these cases, a balloon catheter is guided through a large vein into the right atrium, during cardiac catheterization. The catheter is threaded into the foramen ovale, a naturally existing hole between the atria that normally closes shortly after birth. The balloon at the end of the catheter is inflated so as to enlarge the foramen ovale enough that it will no longer become sealed. This allows more oxygenated blood to enter the right heart (especially in the case of d-TGA) where it can be pumped to the rest of the body. The balloon is deflated and the catheter is removed. Sometimes the initial surgery is not entirely successful, or there are other factors that make a simple balloon atrial septostomy impossible, such as an older patient whose foramen ovale has already closed. This is when a blade atrial septostomy is performed. The details of the procedure are largely the same, except that a ...

https://en.wikipedia.org/wiki/Atrial_septostomy

The ballistocardiograph (BCG) is a measure of ballistic forces on the heart.[1] Ballistocardiography is a technique for producing a graphical representation of repetitive motions of the human body arising from the sudden ejection of blood into the great vessels with each heart beat.[2] It is a vital sign in the 1-20 Hz frequency range which is caused by the mechanical movement of the heart and can be recorded by noninvasive methods from the surface of the body. It was shown for the first time, after an extensive research work by Dr. Isaac Starr, that the effect of main heart malfunctions can be identified by observing and analyzing the BCG signal.[3] Recent work also validates BCG could be monitored using camera in a non-contact manner[4]. One example of the use of a BCG is a ballistocardiographic scale, which measures the recoil of the persons body who is on the scale. A BCG scale is able to show a persons heart rate as well as their weight. The term ballistocardiograph originated from the ...

https://en.wikipedia.org/wiki/Ballistocardiography

Impedance threshold device. *Slow code. *Lazarus syndrome, spontaneous autoresuscitation where attempts at artificial ...

https://en.wikipedia.org/wiki/Cardiopulmonary_resuscitation

The etymology of the word is derived from the Greek electro, because it is related to electrical activity, kardia, Greek for heart, and graph, a Greek root meaning "to write". Alexander Muirhead is reported to have attached wires to a feverish patient's wrist to obtain a record of the patient's heartbeat in 1872 at St Bartholomew's Hospital.[41] Another early pioneer was Augustus Waller, of St Mary's Hospital in London.[42] His electrocardiograph machine consisted of a Lippmann capillary electrometer fixed to a projector. The trace from the heartbeat was projected onto a photographic plate that was itself fixed to a toy train. This allowed a heartbeat to be recorded in real time. An initial breakthrough came when Willem Einthoven, working in Leiden, the Netherlands, used the string galvanometer (the first practical electrocardiograph) he invented in 1901.[43] This device was much more sensitive than both the capillary electrometer Waller used and the string galvanometer that had been invented ...

https://en.wikipedia.org/wiki/EKG

... is a palliative surgical procedure performed for patients with Tricuspid atresia. It is also part of the surgical treatment path for hypoplastic left heart syndrome. [1][2][3] This procedure has been largely replaced by Bidirectional Glenn procedure. It connects the superior vena cava to the right pulmonary artery.[4] ...

https://en.wikipedia.org/wiki/Glenn_procedure

Partial Anomalous Pulmonary Venous Drainage by CMR. CMR examinations in children typically last 15 to 60 minutes. In order to avoid blurry images the child must remain very still during the examination. Different institutions have different protocols for pediatric CMR, but most children 7 years of age and older can cooperate sufficiently for a good quality examination. Providing an age-appropriate explanation of the procedure to the child in advance will increase the likelihood of a successful study. After proper safety screening, parents can be allowed into the MRI scanner room to help their child complete the examination. Some centers allow children to listen to music or watch movies through a specialized MRI-compatible audiovisual system to reduce anxiety and improve cooperation. However, the presence of a calm, encouraging, supportive parent generally produces better results in terms of pediatric cooperation than any distraction or entertainment strategy short of sedation. If the child ...

https://en.wikipedia.org/wiki/Cardiac_magnetic_resonance_imaging

The original procedure was named for Alfred Blalock, surgeon, Baltimore (1899-1964), Helen B. Taussig, cardiologist, Baltimore/Boston (1898-1986) and Vivien Thomas (1910-1985) who was at that time Blalock's laboratory technician. They all helped to develop the procedure. Taussig, who treated hundreds of infants and children with this disorder, had observed that children with a cyanotic heart defect and a patent ductus arteriosus (PDA) lived longer than those without the PDA. It therefore seemed to her that a shunt which mimicked the function of a PDA might relieve the tetralogy patients' poor oxygenation. In 1943, having broached the possibility of a surgical solution to Robert Gross of Boston without success, Taussig approached Blalock and Thomas in their Hopkins laboratory in 1943. According to the account of the original consultation between the three provided in Vivien Thomas' 1985 autobiography Partners of the Heart, Taussig carefully described the anomaly of Tetralogy of Fallot, but made ...

https://en.wikipedia.org/wiki/Blalock-Taussig_shunt

അഥവാ ഉള്ളടക്കം മറയ്ക്കാൻ നിർദേശിക്കുന്ന മറ്റേതെങ്കിലും പട്ടികകൾ ഉൾപ്പെടുത്തിയിട്ടുണ്ടെങ്കിൽ ഉള്ളടക്കം ...

https://ml.wikipedia.org/wiki/ഫലകം:Cardiac_procedures

... recorded via impedance cardiography. These measures are beneficial because they provide accurate and perceiver-independent ...

https://en.m.wikipedia.org/wiki/Psychophysiology

Impedance: A test to measure lead integrity. Large and/or sudden increases in impedance can be indicative of a lead fracture ... while large and/or sudden decreases in impedance can signify a breach in lead insulation. ...

https://en.wikipedia.org/wiki/Pacemaker

The use of cold for pain relief and as an anti-inflammatory has been known since the time of Hippocrates (460-377 B.C).[11] Since then there have been numerous accounts of ice used for pain relief including from the Ancient Egyptians and Avicenna of Persia (AD 982-1070).[12] Since 1899, Dr. Campbell White used refrigerants for treating a variety of conditions, including: lupus erythematosus, herpes zoster, chancroid, naevi, warts, varicose leg ulcers, carbuncles, carcinomas and epitheliomas. De Quervain successfully used of carbonic snow to treat bladder papillomas and bladder cancers in 1917. Dr Irving S Cooper, in 1913, progressed the field of cryotherapy by designing a liquid nitrogen probe capable of achieving temperatures of -196 °C, and utilizing it to treat of Parkinson's disease and previously inoperable cancer. Cooper's cryoprobe advanced the practice of cryotherapy, which led to growing interest and practice of cryotherapy. In 1964, Dr. Cahan successfully used his liquid nitrogen ...

https://en.wikipedia.org/wiki/Cryoablation

Various antiarrhythmic agents can be used to return the heart to normal sinus rhythm. Pharmacological cardioversion is an especially good option in patients with fibrillation of recent onset. Drugs that are effective at maintaining normal rhythm after electric cardioversion can also be used for pharmacological cardioversion. Drugs like amiodarone, diltiazem, verapamil and metoprolol are frequently given before cardioversion to decrease the heart rate, stabilize the patient and increase the chance that cardioversion is successful. There are various classes of agents that are most effective for pharmacological cardioversion. Class I agents are sodium (Na) channel blockers (which slow conduction by blocking the Na+ channel) and are divided into 3 subclasses a, b and c. Class Ia slows phase 0 depolarization in the ventricles and increases the absolute refractory period. Procainamide, quinidine and disopyramide are Class Ia agents. Class 1b drugs lengthen phase 3 repolarization. They include ...

https://en.wikipedia.org/wiki/Cardioversion

The Rastelli procedure is an open heart surgical procedure developed by Italian physician and cardiac surgery researcher, Giancarlo Rastelli in 1967 at the Mayo Clinic and involves using a pulmonary or aortic homograft conduit to relieve pulmonary obstruction in double outlet right ventricle with pulmonary stenosis. It is used to correct certain combinations of congenital heart defects (CHDs): ...

https://en.wikipedia.org/wiki/Rastelli_procedure

TECAB surgery uses the da Vinci tele-robotic Stereoscopic 3-D Imaging system. The system consists of a robotic "slave" system at the bedside. The robot relays its information to an external surgical control unit, where a cardiac surgeon has a three-dimensional view of the chest cavity, and twin controllers for the robotic arms. The procedure frequently involves grafting of the internal mammary artery to the diseased coronary artery, and therefore does not require external harvesting of blood vessels.[2] ...

https://en.wikipedia.org/wiki/Totally_endoscopic_coronary_artery_bypass_surgery

https://bs.wikipedia.org/wiki/Komorski_natriuretski_peptid

Commissurotomy of heart valves is called valvulotomy, valvotomy,[1] valvuloplasty, or valvoplasty and consists of making one or more incisions at the edges of the commissure formed between the two or three valve leaflets, which relieves the constriction of valvular stenosis (especially mitral valve stenosis). As with many other kinds of surgery, valvular commissurotomy may be done by either open or minimally invasive approaches, and sometimes (but not invariably) the terms surgery and surgical are understood to refer only to the open types, with the minimally invasive types then being referred to as interventional procedures. The minimally invasive approach is through the lumen of a vessel with a catheter, which is why it is often called a transluminal or transcatheter approach. Such approaches begin with a small skin incision to access a vessel that will lead to the heart, making them percutaneous approaches, and they use balloons whose inflation moves the valve leaflets. Thus, altogether, they ...

https://en.wikipedia.org/wiki/Valvulotomy

Impedance cardiography (ICG), also referred to as electrical impedance plethysmography (EIP) or Thoracic Electrical ... The use of impedance cardiography in psychophysiological research was pioneered by the publication of an article by Miller and ... Impedance cardiography (ICG) is a non-invasive technology measuring total electrical conductivity of the thorax and its changes ... Kamath SA, Drazner MH, Tasissa G, Rogers JG, Stevenson LW, Yancy CW (August 2009). "Correlation of impedance cardiography with ...

https://en.wikipedia.org/wiki/Impedance_cardiography

Impedance cardiography synonyms, Impedance cardiography pronunciation, Impedance cardiography translation, English dictionary ... definition of Impedance cardiography. n. 1. An instrument used to record the mechanical movements of the heart. 2. See ... The use of impedance cardiography in the diagnosis of various diseases. IMPEDANCE CARDIOGRAPHY--OLD METHOD, NEW OPPORTUNITIES. ... cardiography. (redirected from Impedance cardiography). Also found in: Thesaurus, Medical, Acronyms, Encyclopedia, Wikipedia. ...

https://www.thefreedictionary.com/Impedance+cardiography

Learn impedance cardiography techniques.. *Measure the change in cardiovascular responses-Stroke Volume (SV), Cardiac Output ( ... Suggested reading: Methodological Guidelines for Impedance Cardiography , PSYCHOPHYSIOLOGY, Vol. 27, No. 1. ... Principles of Impedance Cardiography (ICG), and Ideas for eliciting cardiovascular responses through physical maneuvers and ... This BSL PRO lesson describes hardware and software setup of the BSL System to record ECG, Impedance (Z0), and Derivative ...

https://www.biopac.com/curriculum/h21-impedance-cardiography/

Other: Impedance cardiography noninvasive measure of cardiac index by impedance cardiography.. Other Name: patients with a ... Non Invasive Measurement of Cardiac Index by Impedance Cardiography. The safety and scientific validity of this study is the ... Non Invasive Measurement of Cardiac Index by Impedance Cardiography. Official Title ICMJE Non Invasive Measurement of Cardiac ... In this study the investigators want to evaluate the impedance cardiography (ICG) as a non invasive method for CI measurement. ...

https://clinicaltrials.gov/ct2/show/record/NCT01607515?term=%22High+Blood+Pressure%22&lup_s=04%2F10%2F2013&lup_d=14&show_rss=Y&sel_rss=mod14

Impedance Cardiography to Decrease the Risk of Preeclampsia. The safety and scientific validity of this study is the ... Impedance cardiography helps determine whether vasoconstriction or an elevated cardiac output is occurring. The test is easy to ... To determine if the use of impedance cardiography can identify appropriate medications for use in treating chronic hypertensive ... Anti-hypertensive medication prescribed for increased systemic vascular resistance as determined by impedance cardiography ...

https://clinicaltrials.gov/ct2/show/NCT03245970

... 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 ...

https://www.bioportfolio.com/resources/trial/103114/PREVENT-HF-Prevention-of-Heart-Failure-Events-With-Impedance-Cardiography-Testing.html

Extremely useful for impedance cardiography and ECG signal analysis, ensemble averaging passes can be located around data- ...

https://www.biopac.com/application/icg-impedance-cardiographycardiac-output/advanced-feature/ensemble-averaging/

Cardiography, Impedance*. Female. Hemodynamics. Humans. Hypotension / etiology*, physiopathology. Kidney Failure, Chronic / ... resistance were investigated in 68 patients on chronic intermittent hemodialysis utilizing bioelectrical impedance cardiography ...

http://www.biomedsearch.com/nih/Systemic-vascular-resistance-in-intradialytic/9917537.html

... 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 ... Age-related differences in the morphology of the impedance cardiography signal. Journal of Electrical Bioimpedance. 2019, 10(1 ...

https://www.duo.uio.no/handle/10852/76959?show=full

... 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 ... Cardiography, Impedance / methods*. Electrodes. Finite Element Analysis. Heart / physiology*. Humans. Models, Cardiovascular*. ... Transthoracic electrical impedance (or admittance) cardiography is a simple technique for the non-invasive and continuous ...

http://www.biomedsearch.com/nih/Experimental-numerical-study-optimal-spot/18003025.html

Using the Impedance Cardiography signal, various valvular heart diseases (VHD) such as mitral & aortic insufficiency, mitral & ... paper an overview literature survey of the non-invasive methods for measuring the cardiac output by the impedance cardiography ... Using the Impedance Cardiography signal, various valvular heart diseases (VHD) such as mitral & aortic insufficiency, mitral & ... paper an overview literature survey of the non-invasive methods for measuring the cardiac output by the impedance cardiography ...

http://www.indianjournals.com/ijor.aspx?target=ijor:rjpt&volume=12&issue=2&article=074

In this chapter it is described the problem of ambulatory impedance cardiography validation against the clinically accepted ... Cybulski G. (2011) Validation of the Ambulatory Impedance Cardiography Method. In: Ambulatory Impedance Cardiography. Lecture ... Cybulski, G.: Dynamic impedance cardiography--the system and its applications. Pol. J. Med. Phys. Eng. 11(3), 127-209 (2005) ... Aust, P.E., Belz, G.G., Belz, G., Koch, W.: Comparison of impedance cardiography for measurement of stroke volume. Eur. J. Clin ...

https://rd.springer.com/chapter/10.1007/978-3-642-11987-3_4?error=cookies_not_supported&code=31d099d1-e0fa-4608-aafa-6b28e3e06ee4

... ... Materials and Methods: In the last years, impedance cardiography (ICG) is a technique which has gained much attention. However ... CitationEscrivá, J., Gambus, P., Jensen, E.W., Vallverdu, M. Time-frequency features for impedance cardiography signals during ... Time-Frequency Distributions (TFDs) with 5 different kernels are used in order to analyze impedance cardiography signals (ICG) ...

https://upcommons.upc.edu/handle/2117/115165

Cardiac Output Measured by Transthoracic Impedance Cardiography at Rest, during Exercise and at Various Lung Volumes A. T. ... 5. Transthoracic impedance cardiography is a rapid, non-invasive technique for measurement of cardiac output. It requires very ... A. T. Edmunds, S. Godfrey, Marion Tooley; Cardiac Output Measured by Transthoracic Impedance Cardiography at Rest, during ... 1. Cardiac output measured by transthoracic impedance cardiography has been compared with simultaneous measurements made by the ...

https://portlandpress.com/clinsci/article-abstract/63/2/107/72949/Cardiac-Output-Measured-by-Transthoracic-Impedance

The hemodynamic pattern and thoracic fluid content were evaluated by impedance cardiography. In addition, office and 24-hour ... Pilot Study Using Impedance Cardiography. Rev. am. med. respir. [online]. 2019, vol.19, n.3, pp.203-210. ISSN 1852-236X. ...

http://www.scielo.org.ar/scielo.php?script=sci_abstract&pid=S1852-236X2019000300008&lng=en&nrm=iso&tlng=en

... with impedance has been to measure changes in thoracic impedance for only those beats of the impedance cardiogram (IC) which ... Stroke volume measurement during supine and upright cycle exercise by impedance cardiography. *Jon K. Moon, Andrew R Coggan, ... Temporal stability of ambulatory stroke volume and cardiac output measured by impedance cardiography.. *Annebet D. Goedhart, ... with impedance has been to measure changes in thoracic impedance for only those beats of the impedance cardiogram (IC) which ...

https://www.semanticscholar.org/paper/Influence-of-respiration-on-stroke-volume-by-Doerr-Miles/258558cc1120d1686ad7d3e7579c521aa8391331

Thoracic impedance cardiography (ICG) allows continuous, non-invasive SV assessment. However, SV determination relies on ... Validation of thoracic impedance cardiography by echocardiography in healthy late pregnancy. *Jordan PR McIntyre. 1,2. , ... Impedance Cardiography. Broken lines indicate mean ± 1.96 SD. HR, SV and CO are in beats per minute, mL, and L.min−1, ... Thoracic impedance cardiography (ICG) may overcome some of the disadvantages of the other methods. ICG is a method of non- ...

https://bmcpregnancychildbirth.biomedcentral.com/articles/10.1186/s12884-015-0504-5

Whole Body Impedance Cardiography & Continuous Pulse Wave Analysis in the Measurement of Human Haemodynamics during Passive ... Non-invasive haemodynamic measurements were performed by applying whole body impedance cardiography, continuous pulse wave ...

http://coronetbooks.com/books/new/whol6258.html

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 ...

https://www.semanticscholar.org/paper/Validity-of-cardiac-output-measurement-by-impedance-Pickett-Buell/c00a01bb89ed9602c5f6bf8b7b7dc2db2a169e45

Antonyms for Impedance cardiography. 1 synonym for cardiography: electrocardiography. What are synonyms for Impedance ... Cybulski, "Ambulatory impedance cardiography," in Ambulatory Impedance Cardiography.. Simultaneous Recording of ICG and ECG ... One of such methods could be impedance cardiography (ICG).. Comparison of non-invasive methods--impedance cardiography and 2- ... Impedance cardiography synonyms, Impedance cardiography antonyms - FreeThesaurus.com https://www.freethesaurus.com/Impedance+ ...

https://www.freethesaurus.com/Impedance+cardiography

Impedance" by people in this website by year, and whether "Cardiography, Impedance" was a major or minor topic of these ... "Cardiography, Impedance" is a descriptor in the National Library of Medicines controlled vocabulary thesaurus, MeSH (Medical ... Below are the most recent publications written about "Cardiography, Impedance" by people in Profiles. ... A type of impedance plethysmography in which bioelectrical impedance is measured between electrodes positioned around the neck ...

https://profiles.wakehealth.edu/display/94960

Impedance Cardiography is a useful diagnostic tool with External Counterpulsation (ECP and EECP) Therapy to track improvements ... Filed Under: ECP Message Boards Tagged With: ecp therapy with impedance cardiography icg, eecp with icg, impedance cardiography ... Impedance Cardiography (ICG). October 16, 2013. External Counterpulsation Therapy has proven to remarkable benefits to overall ... Impedance Cardiography (ICG). ICG is a diagnostic tool that measures 12 different parameter relating to Flow, Resistance, ...

http://ecptherapy.com/impedance-cardiography/

Impedance Cardiography (ICG) is a simple diagnostic tools that derives 12 parameters related to cardiac flow, resistance, ... Filed Under: ECP Message Boards Tagged With: ecp therapy with impedance cardiography icg, eecp with icg, impedance cardiography ... Impedance Cardiography (ICG). ICG is a diagnostic tool that measures 12 different parameter relating to Flow, Resistance, ... in conjunction with Impedance Cardiography, you email our staff at [email protected] ...

http://ecptherapy.com/impedance-cardiography-icg/

... the reliability of impedance cardiography derived measures have not been evaluated. Thirty-three children, ages 8-11 ... Results indicated the impedance measures showed moderately high temporal stability (average scores r(avg) = 74; difference ... cardiovascular reactivity to laboratory stressors can be reliably and consistently assessed using impedance cardiography. ... OBrien, William H. and McGrath, Jennifer J., "Pediatric Impedance Cardiography: Temporal Stability and Intertask Consistency ...

https://scholarworks.bgsu.edu/psych_pub/6/

Impedance cardiography (ICG) is a noninvasive and low-cost method of examination. The survey technique is simple and ICG ... Impedance cardiography (ICG) is a noninvasive and low-cost method of examination. The survey technique is simple and ICG ... Comparing impedance cardiography and echocardiography in the assessment of reduced left ventricular systolic function. ... Thompson B, Drazner MH, Dries DL, Yancy CW: Systolic time ratio by impedance cardiography to distinguish preserved vs impaired ...

https://bmcresnotes.biomedcentral.com/articles/10.1186/1756-0500-6-114

ICG is sensitivity to movement artifacts inter alia breathing, which distorts impedance signal. Several methods were proposed ... Impedance cardiography (ICG) allows to measure parameters of heart mechanical function. ... Impedance cardiography (ICG) allows to measure parameters of heart mechanical function. ICG is sensitivity to movement ... Adaptive Filter Removes Variability Caused by Respiration from Impedance Cardiography Signal. Marek Żyliński , Małgorzata ...

https://repo.pw.edu.pl/info/article/WUT40975bb554404fb79bb4bdefb03844c2/

Keywords: PhysioFlow, Impedance Cardiography, hemodynamic variables, cardiac output, stroke volume, non-invasive ... Repeatability of Impedance Cardiography Hemodynamic Variables During Treadmill Exercise Purpose To analyze the day to day ... Repeatability of Impedance Cardiography Hemodynamic Variables During Treadmill Exercise Purpose To analyze the day to day ... Repeatability of Impedance Cardiography in the Measurement of Cardiovascular Hemodynamics During Exercise ...

http://commons.lib.jmu.edu/honors201019/299/

Clinical assessment of electrical impedance cardiography in estimation of stroke volume.. A. Harley, R. J. Bache, J. C. ... Harley A, Bache RJ, Greenfield JC, Howitt G. Clinical assessment of electrical impedance cardiography in estimation of stroke ... Harley, A., Bache, R. J., Greenfield, J. C., & Howitt, G. (1970). Clinical assessment of electrical impedance cardiography in ... Clinical assessment of electrical impedance cardiography in estimation of stroke volume. / Harley, A.; Bache, R. J.; Greenfield ...

https://experts.umn.edu/en/publications/clinical-assessment-of-electrical-impedance-cardiography-in-estim

Impedance Cardiography using Band and Regional Electrodes in Supine, Sitting, and During Exercise. / Patterson, Robert P.; Wang ... Impedance Cardiography using Band and Regional Electrodes in Supine, Sitting, and During Exercise. In: IEEE Transactions on ... Impedance Cardiography using Band and Regional Electrodes in Supine, Sitting, and During Exercise. IEEE Transactions on ... Patterson, R. P., Wang, L., & Raza, S. B. (1991). Impedance Cardiography using Band and Regional Electrodes in Supine, Sitting ...

https://experts.umn.edu/en/publications/impedance-cardiography-using-band-and-regional-electrodes-in-supi

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 ... Lower impedance indicates greater the intrathoracic fluid volume, and as the only fluid volume which changes beat to beat ...

http://www.statemaster.com/encyclopedia/Cardiac-output

In this study the investigators want to evaluate the impedance cardiography (ICG) as a non invasive method for CI measurement. (clinicaltrials.gov)
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)
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)
Validity of cardiac output measurement by computer-averaged impedance cardiography, and comparison with simultaneous thermodilution determinations. (semanticscholar.org)
We conclude that impedance cardiography and carotid technique differ with respect to the measurement of left ventricular ejection times, but not with respect to the measurement of other STI-variables. (forskningsdatabasen.dk)
As a diagnostic tool, bioimpedance sensors have the potential to be used in applications such as detection of cancerous cells, brain and pulmonary function monitoring, impedance cardiography and pneumography, diagnosis of cutaneous pathologies, ischemia monitoring, edema determination, and noninvasive measurement of blood pressure or glucose level. (hindawi.com)
Impedance cardiography (ICG) enables the non-invasive, reproducible, beat-to-beat estimation of stroke volume (SV) changes, and the measurement of the absolute values of the ejection time (ET) and pre-ejection period (PEP), which allows the indirect evaluation of cardiac contractility. (kardiologiapolska.pl)
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)
The impedance plethysmography allows determining changes in volume of the body tissues based on the measurement of the electric impedance at the body surface. (wikipedia.org)
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)
Cardiac output measurement by impedance cardiography (CO-ICG) is a valid and reproducible method. (clinicaltrials.gov)
Validity of the adaptive filter for accurate measurement of cardiac output by impedance cardiography. (nii.ac.jp)
2013) Continuous Measurement of Hemodynamic Alterations during Pharmacologic Cardiovascular Stress Using Automated Impedance Cardiography. (scirp.org)
Evaluation of Impedance Cardiography for Measurement of Stroke Volume in Congenital Heart Disease. (rchsd.org)
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)
Improvement of Left Ventricular Ejection Time Measurement in the Impedance Cardiography Combined with the Reflection Photoplethysmography. (annals.org)

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)
Temporal stability of ambulatory stroke volume and cardiac output measured by impedance cardiography. (semanticscholar.org)
Ambulatory impedance cardiography : the systems and their applications / Gerard Cybulski. (opal-libraries.org)

Impedance cardiography (ICG), also referred to as electrical impedance plethysmography (EIP) or Thoracic Electrical Bioimpedance (TEB) has been researched since the 1940s. (wikipedia.org)
A type of impedance plethysmography in which bioelectrical impedance is measured between electrodes positioned around the neck and around the lower thorax. (wakehealth.edu)
Furthermore a system to assess the relationship between internal pressure and diameter change of the artery was also developed by using the tonometry and the impedance plethysmography. (nii.ac.jp)
The IsenseU-BP+ device presented in this article measures single channel ECG, impedance cardiography and photo plethysmography at the chest. (sintef.no)

Experimental and numerical study on optimal spot-electrodes arrays in transthoracic electrical impedance cardiography. (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)
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 electrical impedance and its first derivative (dZ/dt) were measured at 100 kHz on 10 normal males in supine, sitting, and during upright bicycle exercise in order to compare the contribution of regional electrodes to the standard band electrode signal and to evaluate the possible use of spot electrodes for stroke volume (SV) measurements. (umn.edu)
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)
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)
The electrodes transmit and detect electrical and impedance changes in the thorax. (deltexmedical.com)

Systemic vascular resistance in intradialytic hypotension determined by means of impedance cardiography. (biomedsearch.com)

Luther, "Intraoperative cardiac output monitoring: Comparison of impedance cardiography and thermodilution," Journal of Cardiothoracic and Vascular Anesthesia, vol. (thefreedictionary.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)
Impedance Cardiography: Can It Replace Thermodilution and the Pulmonary Artery Catheter? (ebscohost.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 purpose of this study was to compare the systolic time intervals (STI) obtained by impedance cardiography and by the conventional carotid technique. (forskningsdatabasen.dk)
Impedance cardiography (ICG) is a low-cost, noninvasive test that measures systolic time intervals and may be a method for detecting impaired vs intact EF. (elsevier.com)

Abstract: Electrical impedance tomography (EIT) is an promising imaging technology for continuous bedside monitoring of ventilation and perfusion. (worldcat.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)

Non-invasive haemodynamic measurements were performed by applying whole body impedance cardiography, continuous pulse wave analysis and plethysmographic finger blood pressure measurements in supine position and during head-up tilt. (coronetbooks.com)
Parameters of blood flow, vascular resistance, myocardial contractility and thoracic fluid content were measured in a 10-minute supine resting test by impedance cardiography. (aaem.pl)

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)
Can noninvasive impedance cardiography (ICG) now be used to measure CO (COICG) in place of COTD? (ebscohost.com)

Thoracic impedance cardiography (ICG) allows continuous, non-invasive SV assessment. (biomedcentral.com)
Clinical assessment of electrical impedance cardiography in estimation of stroke volume. (umn.edu)
Introduction: Impedance cardiography (IC) derived from morphological analysis of the thoracic impedance signal is now commonly used for noninvasive assessment of cardiac output (CO) at rest and during exercise. (northumbria.ac.uk)
A. P. Hills and N. M. Byrne, "Bioelectrical impedance and body composition assessment," Malaysian Journal of Nutrition , vol. 4, pp. 107-112, 1998. (hindawi.com)
W. J. Rutherford, "Comparison of bioelectrical impedance and skinfolds with hydrodensitometry in the assessment of body composition in healthy young adults," Journal of Research , vol. 6, no. 2, pp. 56-60, 2011. (hindawi.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)
d) determining a second indicator using the second impedance change, the second indicator being indicative of a venous volume for use in assessment of CMP function. (freepatentsonline.com)

Cybulski, G.: Computer method for automatic determination of stroke volume using impedance cardiography signals. (springer.com)
Cybulski, G.: Dynamic impedance cardiography--the system and its applications. (springer.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)

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)
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)
has been widely used for the detection of the electrical impedance. (biomedsearch.com)
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)
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)
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)
T. Repo, D. H. Paine, and A. G. Taylor, "Electrical impedance spectroscopy in relation to seed viability and moisture content in snap bean ( Phaseolus vulgaris L.)," Seed Science Research , vol. 12, no. 1, pp. 17-29, 2002. (hindawi.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)
Apfel H (1990) Electrical impedance of the carotid artery in response to various types of stress. (springer.com)
Gaw RL, Cornish BH, Thomas BJ (2008) The electrical impedance of pulsatile blood flowing through rigid tubes: a theoretical investigation. (springer.com)

The conventional method of calculating stroke volume (SV) with impedance has been to measure changes in thoracic impedance for only those beats of the impedance cardiogram (IC) which cross on a specific baseline. (semanticscholar.org)

M. E. Orazem and B. Tribollet, Impedance Spectroscopy , The ECS Series of Texts and Monographs, Wiley-Inter Sc, 2008. (hindawi.com)

Utility of impedance cardiography to determine cardiac vs. noncardiac cause of dyspnea in the emergency department. (elsevier.com)
The usefulness of bioelectrical impedance analysis in differentiating dyspnea due to decompensated heart failure," Journal of Cardiac Failure , vol. 14, no. 8, pp. 676-686, 2008. (hindawi.com)

D. A. Schoeller, "Bioelectrical impedance analysis. (hindawi.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)

The hemodynamic pattern and thoracic fluid content were evaluated by impedance cardiography. (scielo.org.ar)

Influence of respiration on stroke volume determined by impedance cardiography. (semanticscholar.org)

Impedance cardiography permits continuous noninvasive monitoring of hemodynamic variables on a beat to beat basis. (bgu.ac.il)
quantium Medical Cardiac Output (qCO) uses impedance cardiography in a simple, continuous, and non-invasive way to estimate the Cardiac output (CO) and other hemodynamic parameters such as the Stroke Volume (SV) and Cardiac index (CI). (wikipedia.org)
Impedance cardiography (ICG) is a known non-invasive method which allows continuous estimation of Cardiac Output of the heart of a patient. (tu-ilmenau.de)

Bioimpedance signal (BIS) represents the aorta impedance variation during the heart cycle activity. (scirp.org)

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)

Objective: This works investigates the time-frequency content of impedance cardiography signals during a propofol-remifentanil anesthesia. (upc.edu)
Time-Frequency Distributions (TFDs) with 5 different kernels are used in order to analyze impedance cardiography signals (ICG) before the start of the anesthesia and after the loss of consciousness. (upc.edu)
2) the advantage of RIC is the use of peripheral rather than thoracic impedance signals, supported by correcting factors. (ne.jp)
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)

METHODS: In the present study the variations in blood volume, stroke volume, cardiac output and systemic vascular resistance were investigated in 68 patients on chronic intermittent hemodialysis utilizing bioelectrical impedance cardiography. (biomedsearch.com)
Materials and Methods: In the last years, impedance cardiography (ICG) is a technique which has gained much attention. (upc.edu)
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). (portlandpress.com)
Thoracic impedance cardiography (ICG) may overcome some of the disadvantages of the other methods. (biomedcentral.com)
Both methods had a high degree of reproducibility and this parameter was significantly better within the same day, when impedance cardiography was used (p less than 0.01). (forskningsdatabasen.dk)
We furthermore conclude that both methods are reliable, but we recommend the use of impedance cardiography because it is easier to apply, it may be more precise and it can be used for simultaneous measurements of other haemodynamic variables. (forskningsdatabasen.dk)
Background: Both serum measurements of B-type natriuretic peptide (BNP) and impedance cardiography (ICG) are used to evaluate patients for congestive heart failure (CHF) in the Emergency Department (ED), but the agreement between the data obtained by these two methods remains uncertain. (elsevier.com)
For this purpose an additional bio-medical signal of the peripheral pulse wave the impedance plethysmographic (IPG) curve and its interaction with the impedance cardiographic (ICG) signal of the heart have been evaluated using new methods of signal analysis and modeling to identify new information suitable to appraise the expectable accuracy of impedance cardiography. (tu-ilmenau.de)

and cardiac output, CO] were continuously recorded using an impedance cardiography device (PhysioFlow[R] PF07 Enduro[TM], USA). (thefreedictionary.com)

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)

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)
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)

Cardiography, Impedance" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings) . (wakehealth.edu)

Launch TC-DAPK6 supplier In the 1960s, impedance cardiography originated to monitor cardiac result (CO) [1]. (welbourneprimary.com)

Objective tests of middle ear function based on the difficulty (impedance) or ease (admittance) of sound flow through the middle ear. (bioportfolio.com)

To determine if the use of impedance cardiography can identify appropriate medications for use in treating chronic hypertensive patients to decrease the risk of preeclampsia. (clinicaltrials.gov)

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)
and, c) determining the impedance change using the first and second impedance values. (freepatentsonline.com)

Collete, M., Leftheriotis, G. and Humeau, A. (2009) Modeling and Interpretation of the Bioelectrical Impedance Signal for the Determination of the Local Arterial Stiffness. (scirp.org)
Mansouri, S., Mahjoubi, H. and Ben Salah, R. (2010) Determination of Instantaneous Arterial Blood Pressure from Bio-Impedance Signal. (scirp.org)

The impedance changes with the pulsatile blood flow. (clinicaltrials.gov)
Gaw RL, Cornish BH, Thomas BJ (2007) Comparison of a theoretical impedance model with experimental measurements of pulsatile blood flow. (springer.com)

Kubicek, W.G., Patterson, R.P. and Witsoe, D.A. (1970) Impedance Cardiography as a Non Invasive Method of Monitoring Cardiac Function and Other Parameters of the Cardiovascular System. (scirp.org)

Impedance cardiography (ICG) is a simple and inexpensive method to acquire data on hemodynamic parameters. (cst.com)

Several authors advocate the high reliability and good correlation of cardiography impedance compared to others techniques more established. (wikipedia.org)

They collected symptom data and measured cardiac output using impedance cardiography in 38 people with CFS and 27 matched, sedentary controls. (thefreedictionary.com)
Impedance cardiography and symptom data were collected from 38 patients with CFS grouped into cases with severe (n = 18) and less severe (n = 20) illness and compared with those from 27 matched, sedentary control subjects. (cfids-cab.org)

4. Haemodynamic and autonomic response, both at rest and at 70°, by impedance cardiography. (bmj.com)

ICG is sensitivity to movement artifacts inter alia breathing, which distorts impedance signal. (edu.pl)
The Impedance Cardiography (ICG or Ztot) signal represents the changes of the thoracic impedance due to variations in the blood flow. (wikipedia.org)

The purpose of this study was to evaluate the ability of impedance cardiography to determine the change in cardiac output caused by modifications in the atrioventricular (AV) delay in DDD (dual-chamber) pacing mode while pacing the atrium and ventricle at different programmed rates. (bgu.ac.il)

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)
FIGURE 7-1 Impedance plot curve of resistance and reactance with frequency. (nap.edu)

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Analytical, Diagnostic and Therapeutic Techniques and Equipment26

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Randomised comparison of electrode positions for cardioversion of atrial fibrillation. (1/174)

Cyclic changes in right ventricular output impedance during mechanical ventilation. (2/174)

Three-dimensional endocardial impedance mapping: a new approach for myocardial infarction assessment. (3/174)

Relations of stroke volume and cardiac output to body composition: the strong heart study. (4/174)

Ventricular afterload and ventricular work in fontan circulation: comparison with normal two-ventricle circulation and single-ventricle circulation with blalock-taussig shunts. (5/174)

Endocardial and epicardial steroid lead pacing in the neonatal and paediatric age group. (6/174)

Changes in the transthoracic impedance signal predict the outcome of a 70 degrees head-up tilt test. (7/174)

Respiratory sinus arrhythmia during speech production. (8/174)

Cardiography, Impedance

Electric Impedance

Plethysmography, Impedance

Cardiac Output

Isosorbide

Thoracic Cavity

Heart Auscultation

Heart Sounds

Stroke Volume

Hemodynamics

Kinetocardiography

Phonocardiography

Dielectric Spectroscopy

Vascular Resistance

Heart Rate

Monitoring, Physiologic

Blood Pressure

Reproducibility of Results

Heart Failure

Exercise

Electrocardiography

Encyclopedias as Topic

Exercise Movement Techniques

Hypotension

Hemodiafiltration

Renal Dialysis

Kidney Failure, Chronic

Tomography

Meridians

Echocardiography

Pregnancy

Echocardiography, Transesophageal

Echocardiography, Doppler

Echocardiography, Three-Dimensional

Satellite Imagery

Artifacts

Least-Squares Analysis

Algorithms

Exercise Test

Oxygen Consumption

Randomised comparison of electrode positions for cardioversion of atrial fibrillation. (1/174)

Cyclic changes in right ventricular output impedance during mechanical ventilation. (2/174)

Three-dimensional endocardial impedance mapping: a new approach for myocardial infarction assessment. (3/174)

Relations of stroke volume and cardiac output to body composition: the strong heart study. (4/174)

Ventricular afterload and ventricular work in fontan circulation: comparison with normal two-ventricle circulation and single-ventricle circulation with blalock-taussig shunts. (5/174)

Endocardial and epicardial steroid lead pacing in the neonatal and paediatric age group. (6/174)

Changes in the transthoracic impedance signal predict the outcome of a 70 degrees head-up tilt test. (7/174)

Respiratory sinus arrhythmia during speech production. (8/174)

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