Origins of the impedance change in impedance cardiography by a three-dimensional finite element model.
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Biomedical subjects
Publications and source records attributed to L E Baker.
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Changes in the electrical impedance of the thorax were recorded from various electrode arrays on the thorax during the infusion and withdrawal of saline, plasma, or blood from the right, left, or both hemithoraxes. Impedance changes correlated linearly with the volume of infused fluid. The resistivity of the infused fluid significantly affected the sensitivity (omega/ml) of the impedance method in detecting specific fluid accumulations. The use of hemithoracic electrode arrays permitted the localization of fluid accumulations to a specific hemithorax. Various factors that can alter the magnitude and interpretation of impedance changes are discussed, as they would affect the clinical interpretation of impedance changes, particularly in postoperative patients.
Bioelectric impedance as a sensitive noninvasive technique for detecting and monitoring changes in compartmental body fluid volume was used to compare the efficacy of two hemostatic agents in controlling postoperative abdominal bleeding following surgically induced solid viscera injury. Gelatin foam-oxidized cellulose sponge and bovine MCHH were both effective topical hemostatic agents. It appears that MCCH has certain advantages over conventional agents.
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