Topic
Fick method
About: Fick method is a research topic. Over the lifetime, 218 publications have been published within this topic receiving 7584 citations.
Papers published on a yearly basis
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Papers
TL;DR: NIRS is an appropriate tool to provide information about local muscV(O(2)) and local FBF because both place and depth of the NIRS measurements reveal local differences that are not detectable by the more established, but also more global, Fick method.
Abstract: The aim of this study was to investigate local muscle O(2) consumption (muscV(O(2))) and forearm blood flow (FBF) in resting and exercising muscle by use of near-infrared spectroscopy (NIRS) and to compare the results with the global muscV(O(2)) and FBF derived from the well-established Fick method and plethysmography. muscV(O(2)) was derived from 1) NIRS using venous occlusion, 2) NIRS using arterial occlusion, and 3) the Fick method [muscV(O(2(Fick)))]. FBF was derived from 1) NIRS and 2) strain-gauge plethysmography. Twenty-six healthy subjects were tested at rest and during sustained isometric handgrip exercise. Local variations were investigated with two independent and simultaneously operating NIRS systems at two different muscles and two measurement depths. muscV(O(2)) increased more than fivefold in the active flexor digitorum superficialis muscle, and it increased 1.6 times in the brachioradialis muscle. The average increase in muscV(O(2(Fick))) was twofold. FBF increased 1.4 times independent of the muscle or the method. It is concluded that NIRS is an appropriate tool to provide information about local muscV(O(2)) and local FBF because both place and depth of the NIRS measurements reveal local differences that are not detectable by the more established, but also more global, Fick method.
565 citations
TL;DR: It is concluded that the Physio Flow provides a clinically acceptable and non-invasive evaluation of cardiac output under these conditions and deserves further study using other populations and situations.
Abstract: The objectives of this study were to evaluate the reliability and accuracy of a new impedance cardiograph device, the Physio Flow, at rest and during a steady-state dynamic leg exercise (work intensity ranging from 10 to 50 W) performed in the supine position. We compared cardiac output determined simultaneously by two methods, the Physio Flow (Q˙cPF) and the direct Fick (Q˙cFick) methods. Forty patients referred for right cardiac catheterisation, 14 with sleep apnoea syndrome and 26 with chronic obstructive pulmonary disease, took part in this study. The subjects' oxygen consumption values ranged from 0.14 to 1.19 l · min−1. The mean difference between the two methods (Q˙cFick−Q˙cPF) was 0.04 l · min−1 at rest and 0.29 l · min−1 during exercise. The limits of agreement, defined as mean difference ± 2SD, were −1.34, +1.41 l · min−1 at rest and −2.34, +2.92 l · min−1 during exercise. The difference between the two methods exceeded 20% in only 2.5% of the cases at rest, and 9.3% of the cases during exercise. Thoracic hyperinflation did not alter Q˙cPF. We conclude that the Physio Flow provides a clinically acceptable and non-invasive evaluation of cardiac output under these conditions. This new impedance cardiograph device deserves further study using other populations and situations.
459 citations
TL;DR: A method for the determination in anaesthetized dogs of the right and left cardiac outputs has been described; it depends upon accurate and fast recording of the blood temperature changes which occur in the right ventricle and aorta when cold Ringer solution or blood is injected into the inferior vena cava.
Abstract: A method for the determination in anaesthetized dogs of the right and left cardiac outputs has been described; it depends upon accurate and fast recording of the blood temperature changes which occur in the right ventricle and aorta when cold Ringer solution or blood is injected into the inferior vena cava. The curves defining the blood temperature changes are time-concentration curves, from which the blood flow at the sites of the recording thermocouples can be estimated with an accuracy which is roughly the accuracy of the Fick method. Various errors to which the technique may be subject are considered; attempts have been made to compute their effects quantitatively. The method is here described as the “thermo-dilution” method.
398 citations
TL;DR: Cardiac output determined by Doppler echocardiography was compared with that determined by thermodilution at rest and during dobutamine infusion and by the Fick method at rest in patients with angina pectoris without valvular heart disease.
Abstract: Cardiac output determined by Doppler echocardiography was compared with that determined by thermodilution at rest and during dobutamine infusion in 10 patients (group A) and by the Fick method at rest in 11 patients (group B). All patients had angina pectoris without valvular heart disease. Maximum spatial blood velocity and cross sectional aortic area were estimated by the Doppler technique and echocardiography. Cardiac output was calculated by multiplying blood velocity by aortic area at various levels in the ascending aorta. The best correlation of cardiac output between the invasive and non-invasive methods was obtained when maximum velocity in the aortic root and the aortic orifice area were used in the calculations. Cardiac output was considerably overestimated when area measurements in the aortic root were used.
353 citations
TL;DR: It is concluded that thermodilution and acetylene rebreathing are useful tools for assessing cardiac output in patients with pulmonary hypertension, even in the presence of low cardiac output or severe tricuspid regurgitation.
Abstract: Assessment of cardiac output is an important part of the management of patients with pulmonary hypertension. The accuracy of the thermodilution technique in patients with low cardiac output or severe tricuspid regurgitation has been questioned. To address this issue, we simultaneously compared 105 cardiac output measurements by the Fick method and thermodilution in 35 patients with pulmonary hypertension. Moreover, we evaluated the acetylene rebreathing technique, a noninvasive method of determining cardiac output. The mean difference +/- 95% limit of agreement between thermodilution and the Fick method was +0.01 +/- 1.1 L/min. The mean difference +/- 95% limit of agreement between acetylene rebreathing and the Fick method was -0.23 +/- 1.14 L/min. Neither the mean agreement nor the 95% limits of agreement of both thermodilution and acetylene rebreathing with the Fick method were affected by the presence of low cardiac output or severe tricuspid regurgitation. We conclude that thermodilution and acetylene rebreathing are useful tools for assessing cardiac output in patients with pulmonary hypertension, even in the presence of low cardiac output or severe tricuspid regurgitation.
265 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 2 |
| 2020 | 2 |
| 2019 | 2 |
| 2018 | 2 |
| 2016 | 2 |
| 2015 | 7 |