Fick principle


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Related to Fick principle: Fick's law

Fick meth·od

(fik),
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

Fick principle

In respiratory physiology, blood flow equals the amount of a substance absorbed in an organ divided by the difference in the amount of the substance entering and leaving the organ. Usually the substance is oxygen or a dye. Synonym: Fick equation

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

Fick principle

the amount of a substance taken up by the circulation per unit of time equals the arterial level of the substance minus the venous level multiplied by the blood flow. Used to measure cardiac output.