Talk:Fick principle

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Comment[edit]

Adolph Fick first derived a solution for Cardiac Output from the ventricles of the heart. Cardiac Output is a close volumetric equivalent to Ejection Fraction. Minimum Volume or MinV is a more mathematically simplified expression of CO. Ejection Fraction, Cardiac Output and MinV all attempt a volumetric definition of Systole of the heart.

Inverted, Fick offers a solution for Diastole. Mathematical inversion of Fick for Diastole implies Injection Fraction , Cardiac Input or MaxV. These inverted ratios attempt volumetric definition of diastole.

shunting effects on Fick[edit]

Assuming there are no shunts across the pulmonary system, the pulmonary blood flow equals the systemic blood flow.

This statement is not true. The pulmonary blood flow equals the systemic blood flow -unless- there is shunting from the left heart into the right heart (e.g. a ventricular septal defect), which would cause pulmonary blood flow to exceed systemic blood flow. A shunt across the pulmonary system from the right heart to the left heart (e.g. an arteriovenous malformation in the lung) alters oxygenation, but it does not lead to a discrepancy in the throughput of the right vs. left heart. Edited accordingly. shrimppesto (talk) 01:41, 2 February 2011 (UTC)[reply]

Direct Fick[edit]

Direct Fick method has been redirected here. Its contents said: "The Direct Fick method is a method of measuring cardiac output using the Fick principle. It divides the oxygen intake by the difference in oxygen content of aortic blood and mixed venous blood." This might make more sense to lay people than what's currently in the article. WhatamIdoing (talk) 21:53, 16 September 2015 (UTC)[reply]

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