By Gerard Cybulski
”Ambulatory Impedance Cardiography” supplies the reader the required actual historical past of impedance cardiography (ICG) and at present to be had platforms for hemodynamics holter tracking. It compares ambulatory ICG and different clinically authorised equipment via an up to date cutting-edge. The ebook is split in four components. within the first one, the significance of the research of the cardiac dynamics utilizing the ambulatory tracking strategy is gifted. the second one half comprises the outline of foundations of ICG, the versions used to explain the ICG procedure and the outline of obtainable structures for ambulatory tracking of cardiac hemodynamics. The 3rd half is dedicated to the validation of the ambulatory ICG procedure, the verification of the standard of long-term ICG recordings and the dialogue of the constraints of this system. within the final half, a few scientific and study functions of the ICG ambulatory tracking are presented.
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Extra resources for Ambulatory Impedance Cardiography: The Systems and their Applications
11 Physiological and Clinical Applications of Impedance Cardiography The ICG method has been applied to evaluation of changes in cardiac output during exercise in many different studies, starting from those reported by Miyamoto et al. [48, 50, 51], Miles et al. . Bogaard et al.  published a review of the possibilities of hemodynamic measurements by ICG during exercise. They concluded that, although ICG ‘‘derived stroke volume calculation is based on several debated assumptions, numerous validation studies have shown good accuracy and reproducibility, also during exercise’’.
19, 773–778 (1940) 63. : Plethysmography. Impedance. In: Glasser, O. ) Medical Physics, vol. 2, pp. 736–743, Year Book Publishers, Chicago (1950) 64. : Electrical properties of biological tissues, their measurements and biomedical applications. Automedica 17, 343–365 (1999) 65. : Sources of the thoracic cardiogenic electrical impedance signal as determined by a model. Med. Biol. Eng. Comput. 23, 411–417 (1985) 66. : Theory and cardiac applications of electrical impedance measurements. CRC Crit.
However, Swanson and Webster estimated that blood resistivity is positively correlated with blood velocity and may change by 10% within the physiological range of the flow . Thus it seemed that application of a constant value of r gives a smaller error than the introduction of another measurement (resistivity), which is out of control. Wtorek et al. also pointed out the anisotropy of the resistivity of flowing blood [95, 96]. The ICG method is sensitive to artefacts, so motion, anxiety, restlessness, shivering, and hyperventilation may interfere with measurements and modify physiologic responses.
Ambulatory Impedance Cardiography: The Systems and their Applications by Gerard Cybulski