Basic principles of electrohaemodynamics

Djordjevich, Ljubomir; Sadove, Max S.

doi:10.1016/0141-5425(81)90101-1

Cited by 12 publications

(8 citation statements)

References 2 publications

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“…The electromagnetic flow meters are based on induction of voltage changes proportional to the flow of blood (Kolin, 1936(Kolin, , 1941Djordjevich & Sadove, 1981). As blood is a conductive liquid, an electromotive force is induced, which can be derived as: electromotive force = B × L × u, where B is the magnetic flux density (T), L is the distance between the electrodes (m), and u is the instantaneous blood velocity (m/s; Webster, 1978).…”

Section: Electromagnetic Flow Metersmentioning

confidence: 99%

Limb and skeletal muscle blood flow measurements at rest and during exercise in human subjects

Rådegran

1999

Proc. Nutr. Soc.

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Abbreviations: ∆f, Doppler frequency shift that occurs as transmitted sound waves of a specific frequency f are reflected by erythrocytes; ICG, indo-cyanine green; NIRS, near i.r. spectroscopy; PET, positron emission tomography. The aim of the present review is to present techniques used for measuring blood flow in human subjects and advice as to when they may be applicable. Since blood flow is required to estimate substrate fluxes, energy turnover and metabolic rate of skeletal muscle, accurate measurements of blood flow are of extreme importance. Several techniques have therefore been developed to enable estimates to be made of the arterial inflow to, venous outflow from, or local blood flow within the muscle. Regional measurements have been performed using electromagnetic flow meters, plethysmography, indicator methods (e.g. thermodilution and indo-cyanine green dye infusion), ultrasound Doppler, and magnetic resonance velocity imaging. Local estimates have been made using 133 Xe clearance, microdialysis, near i.r. spectroscopy, positron emission tomography and laser Doppler. In principle, the aim of the study, the type of interventions and the limitations of each technique determine which method may be most appropriate. Ultrasound Doppler and continuous indo-cyanine green dye infusion gives the most accurate limb blood flow measurements at rest. Moreover, the ultrasound Doppler is unique, as it does not demand a steadystate, and because its high temporal resolution allows detection of normal physiological variations as well as continuous measurements during transitional states such as at onset of and in recovery from exercise. During steady-state exercise thermodilution can be used in addition to indo-cyanine green dye infusion and ultrasound Doppler, where the latter is restricted to exercise modes with a fixed vessel position. Magnetic resonance velocity imaging may in addition be used to determine blood flow within deep single vessels. Positron emission tomography seems to be the most promising tool for local skeletal muscle blood-flow measurements in relation to metabolic activity, although the mode and intensity of exercise will be restricted by the apparatus design.

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Section: Electromagnetic Flow Metersmentioning

confidence: 99%

Limb and skeletal muscle blood flow measurements at rest and during exercise in human subjects

Rådegran

1999

Proc. Nutr. Soc.

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“…Consequently, each systolic increase in the aortic blood volume is associated with a proportional increase in the measurable conductance of the whole body (Fig 1). 16 Thus, for measuring the aortic SV by means of its impedance change, Frinerman and Tsoglin developed the following algorithm 14 :…”

Section: Measuring CImentioning

confidence: 99%

“…Recordings of the interrelation between impedance variations and hemodynamic parameters, according to Djordjevich and Sadove 16. …”

mentioning

confidence: 99%

Accurate, Noninvasive Continuous Monitoring of Cardiac Output by Whole-Body Electrical Bioimpedance

Cotter

Moshkovitz

Kaluski

et al. 2004

Chest

118

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“…Existing methods for tissue oxygenation measurement include the use of polarographic microelectrodes, 9 transcutaneous oxygen meters, 10 pulse oximeters, 11 and hyperspectral imaging. 12 In addition, current techniques for perfusion measurement include electrohemodynamics, 13 magnetic resonance imaging, 14 laser Doppler, 15 thermodilution, 16 radiation tracers, 17 and use of Indocyanine Green dye. 18 Among existing tools for oxygenation and perfusion measurements, the emerging optical imaging tools are able to map tissue optical characteristics and functional properties in a rapid, cost effective, and noninvasive fashion.…”

Section: Introductionmentioning

confidence: 99%

Quasi-simultaneous multimodal imaging of cutaneous tissue oxygenation and perfusion

Ren

Gan

et al. 2015

J. Biomed. Opt

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Simultaneous and quantitative assessment of multiple tissue parameters may facilitate more effective diagnosis and therapy in many clinical applications, such as wound healing. However, existing wound assessment methods are typically subjective and qualitative, with the need for sequential data acquisition and coregistration between modalities, and lack of reliable standards for performance evaluation or calibration. To overcome these limitations, we developed a multimodal imaging system for quasi-simultaneous assessment of cutaneous tissue oxygenation and perfusion in a quantitative and noninvasive fashion. The system integrated multispectral and laser speckle imaging technologies into one experimental setup. Tissue oxygenation and perfusion were reconstructed by advanced algorithms. The accuracy and reliability of the imaging system were quantitatively validated in calibration experiments and a tissue-simulating phantom test. The experimental results were compared with a commercial oxygenation and perfusion monitor. Dynamic detection of cutaneous tissue oxygenation and perfusion was also demonstrated in vivo by a postocclusion reactive hyperemia procedure in a human subject and a wound healing process in a wounded mouse model. Our in vivo experiments not only validated the performance of the multimodal imaging system for cutaneous tissue oxygenation and perfusion imaging but also demonstrated its technical potential for wound healing assessment in clinical practice.

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Basic principles of electrohaemodynamics

Cited by 12 publications

References 2 publications

Limb and skeletal muscle blood flow measurements at rest and during exercise in human subjects

Limb and skeletal muscle blood flow measurements at rest and during exercise in human subjects

Accurate, Noninvasive Continuous Monitoring of Cardiac Output by Whole-Body Electrical Bioimpedance

Quasi-simultaneous multimodal imaging of cutaneous tissue oxygenation and perfusion

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