Surgery – Diagnostic testing – Measuring electrical impedance or conductance of body portion
Patent
1997-09-19
2000-08-01
Lacyk, John P.
Surgery
Diagnostic testing
Measuring electrical impedance or conductance of body portion
600506, 600509, A61B 505
Patent
active
060959878
ABSTRACT:
Apparatus and methods are provided for monitoring cardiac output using bioelectrical impedance techniques in which first and second electrodes are placed in the trachea and/or bronchus in the vicinity of the ascending aorta, while an excitation current is injected into the thorax via first and second current electrodes, so that bioelectrical impedance measurements based on the voltage drop sensed by the first and second electrodes reflect voltage changes induced primarily by blood flow dynamics, rather than respiratory or non-cardiac related physiological effects. Additional sense electrodes may be provided, either internally, or externally, for which bioelectrical impedance values may be obtained. Methods are provided for computing cardiac output from bioelectrical impedance values. Apparatus and methods are also provided so that the measured cardiac output may be used to control administration of intravenous fluids to an organism or to optimize a heart rate controlled by a pacemaker.
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Shmulewitz Ascher
Wallace Arthur A.
Imagyn Medical Techonologies California, Inc.
Lacyk John P.
Pisano Nicola A.
Wingood Pamela L.
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