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in 1870 A. Fick proposed that cardiac output can be calculated as the quotient of total body oxygen consumption divided by the difference in oxygen content of arterial blood and mixed venous blood. In the direct Fick method, all variables are measured. The indirect Fick method employs a variety of means to avoid measuring mixed venous oxygen content. By extension, the Fick method may be used to measure cardiac output or organ blood flow with any indicator substance for which the rate of uptake or consumption, and the arterial and mixed venous concentrations, can be measured, provided the indicator does not enter or leave the system by any route not being measured.
Synonym(s): Fick principle
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Fick meth·od(fik meth'ŏd)
A method of calculating cardiac output or organ blood flow from measurements of oxygen consumption and of the difference in oxygen concentration between arterial and venous.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
Determination of cardiac output by calculation of the difference in oxygen content of mixed venous and arterial blood. This figure is then divided into the total oxygen consumption.
See also: Fick, Adolf Eugen
Medical Dictionary, © 2009 Farlex and Partners
Fick,Adolf, German physician, 1829-1901.
Fick method - cardiac output can be calculated as the quotient of total body oxygen consumption divided by the difference in oxygen content of arterial blood and mixed venous blood. Synonym(s): Fick principle
Fick principle - Synonym(s): Fick method
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