Fick equation (cardiac output formula) The most common formula used for determining the cardiac output is the Fick equation. It states that: CO=VO2 / (Ca−Cv)CO=VO2 / (Ca−Cv) where: VO2VO2 stands for the oxygen consumption of pure gaseous oxygen (in mL/minute); CaCa is the co...
A patient has a total oxygen consumption of 280ml, arterial oxygen content of 19.5 and a mixed venous blood content of 12. What is the patients cardiac output using the Fick equation? CO = VO2/[(CaO2-CvO2) x 10] CO= 280ml / (19.5-12) x 10 ...
1 9 Cardiac output (CO) determined by ther- modilution (TD) compared to various indirect Fick methods with best-fit lines and simple linear regression Table 4 Discrepancies greater than 20% between different iFM-CO methods and TD-CO iFM-CO/TD-CO Cohen's κ < 0.8 (N, %) 0.8–1.2 (N...
The mitral valve area was determined by the Gorlin formula, and R and T were measured from the pressure tracings recorded at cardiac catheterization. The degree of correspondence between the equation tested and the measured cardiac output as determined by the Fick principle technique is characterized...
Three common formulae were used to calculate iFick for comparison - Lafarge, Dehmer, and Bergstra. Thermodilution was measured in triplicate and averaged with removal of outliers. Correlation between each method and direct Fick was assessed with linear regression. Bias between each method and direct...
An FiO2 >0.3 is likely to result in oxygen being dissolved in the blood, which should be taken into account in the Fick calculations by measuring PaO2. Even though it is recommended that PaO2 is measured in such cases, it is recognized that the above formula gives a low relative importance...
A simple mathematical derivation of the Stewart-Hamilton formula for the determination of cardiac output A derivation of the Stewart-Hamilton formula is presented which is applicable to all the most usual cardiac output measurement techniques and also to the d... ME Valentinuzzi,LA Geddes,LE Baker...
Comparison between cardiac out- put measured by thermodilution technique and calculated by O2 and modi- fied CO2 Fick methods using a new metabolic monitor. Intensive Care Med 1997; 23: 908-915.Brandi LS, Bertolini R, Pieri M, Giunta F, Calafà M (1997) Comparison between cardiac output ...
A method and apparatus for ascertaining the cardiac output of a human patient, said method comprising the steps of: measuring the systolic velocity of the blood flowing through the patient's descending aorta; determining the cross-sectional area of the patient's ascending aorta; and calculating the...
One of the indirect methods of measuring cardiac output is the Fick method which determines such output by examining both the oxygen consumption of the lungs and the difference between arterial and venuous oxygen concentrations. A second method involves indicator dilution. Early indicator techniques use...