Impedance cardiograph apparatus and method
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United States of America Patent
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Apr 9, 1996
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N/A
app pub date -
Jul 7, 1994
filing date -
Jul 7, 1994
priority date (Note) -
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Abstract
An impedance cardiograph which determines cardiac output from a measurement of variations of chest impedance, provides an improved method of calculating the effect of patient volume on the measurement from measurable patient height and chest circumference, and provides a correction process that identifies as a source of error variations in the first derivative of impedance. This latter source of error is minimized by preprocessing the impedance derivative value with a compression function which reduces the range of values of the impedance derivative when that value differs significantly from a norm of the population.
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