Evaluation of cardiac output by 5 arterial pulse contour techniques using trend interchangeability method

Fischer, Marc-Olivier; Diouf, Momar; Wilde, R. B. P. de; Dupont, Hervé; Hanouz, Jean‐Luc; Lorne, Emmanuel

doi:10.1097/md.0000000000003530

Cited by 28 publications

(40 citation statements)

References 18 publications

(31 reference statements)

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Section: Resultsmentioning

confidence: 99%

“…Although Bland–Altman analysis is of widespread use, it does not provide objective information concerning the interchangeability of the methods/devices under comparison. To overcome this problem, the trend interchangeability method has recently been proposed (Fischer et al., ). For the first time, this method was applied to the comparison of

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data obtained by different breath‐by‐breath gas exchange algorithms.…”

Section: Discussionmentioning

confidence: 99%

“…For the first time, a recently proposed method (Fischer et al., ), so far used mainly for the comparison of devices to assess cardiac output, has been applied to compare the average gas exchange data. The criteria for interpretation of the results of this method, and its limitations and/or potentiality, however, are yet to be elucidated fully.…”

Section: Discussionmentioning

confidence: 99%

“…The O 2 uptake values provided by the different algorithms were also evaluated using the trend interchangeability method, which was designed to define the interchangeability of each change of a variable (Fischer et al., ). The plug‐and‐play method provided by Fisher et al (), first classifies each change as uninterpretable or interpretable; among the latter, each case is classified further as interchangeable, in the grey zone or non‐interchangeable, on the basis of the repeatability coefficient set for the reference method. The trend interchangeability rate is then calculated as the ratio of the number of interchangeable changes and the total number of interpretable changes.…”

Section: Methodsmentioning

confidence: 99%

“…For the first time, a recently proposed method (Fischer et al, 2016), so far used mainly for the comparison of devices to assess cardiac output, has been applied to compare the average gas exchange data.…”

Section: Strengths and Limitationsmentioning

confidence: 99%

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Breath‐by‐breath oxygen uptake during running: Effects of different calculation algorithms

Koschate

Cettolo

Hoffmann

et al. 2019

Experimental Physiology

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New Findings What is the central question of this study?Breath‐by‐breath gas exchange analysis during treadmill exercise can be disturbed by different breathing patterns depending on cadence, and the flow sensor might be subjected to variable mechanical stress. It is still unclear whether the outcomes of the gas exchange algorithms can be affected by running at different speeds. What is the main finding and its importance?Practically, the three investigated breath‐by‐breath algorithms (‘Wessel’, ‘expiration‐only’ and ‘independent breath’) provided similar average gas exchange values for steady‐state conditions. The ‘independent breath’ algorithm showed the lowest breath‐by‐breath fluctuations in the gas exchange data compared with the other investigated algorithms, both at steady state and during incremental exercise. Abstract Recently, a new breath‐by‐breath gas exchange calculation algorithm (called ‘independent breath’) was proposed. In the present work, we aimed to compare the breath‐by‐breath O2 uptake (V̇normalO2) values assessed in healthy subjects undergoing a running protocol, as calculated applying the ‘independent breath’ algorithm or two other commonly used algorithms. The traces of respiratory flow, O2 and CO2 fractions, used by the calculation algorithms, were acquired at the mouth on 17 volunteers at rest, during running on a treadmill at 6.5 and 9.5 km h−1, and thereafter up to volitional fatigue. Within‐subject averages and standard deviations of breath‐by‐breath V̇normalO2 were calculated for steady‐state conditions; the V̇normalO2 data of the incremental phase were analysed by means of linear regression, and their root mean square was assumed to be an index of the breath‐by‐breath fluctuations. The average values obtained with the different algorithms were significantly different (P < 0.001); nevertheless, from a practical point of view the difference could be considered ‘small’ in all the investigated conditions (effect size <0.3). The standard deviations were significantly lower for the ‘independent breath’ algorithm (post hoc contrasts, P < 0.001), and the slopes of the relationships with the corresponding data yielded by the other algorithms were <0.70. The root mean squares of the linear regressions calculated for the incremental phase were also significantly lower for the ‘independent breath’ algorithm, and the slopes of the regression lines with the corresponding values obtained with the other algorithms were <0.84. In conclusion, the ‘independent breath’ algorithm yielded the least breath‐by‐breath O2 uptake fluctuation, both during steady‐state exercise and during incremental running.

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Section: Resultsmentioning

confidence: 99%

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data obtained by different breath‐by‐breath gas exchange algorithms.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Strengths and Limitationsmentioning

confidence: 99%

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Breath‐by‐breath oxygen uptake during running: Effects of different calculation algorithms

Koschate

Cettolo

Hoffmann

et al. 2019

Experimental Physiology

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Assessment of changes in blood glucose concentration with intravascular microdialysis

Fischer

Gouëzel

Fradin

et al. 2018

J Clin Monit Comput

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Blood glucose and its variability of is a major prognostic factor associated with morbidity. We hypothesized that intravenous microdialysis incorporated in a central venous catheter (CVC) would be interchangeable with changes in blood glucose measured by the reference method using a blood gas analyzer. Microdialysis and central venous blood glucose measurements were simultaneously recorded in high-risk cardiac surgical patients. The correlation between absolute values was determined by linear regression and the Bland-Altman test for repeated measurements was used to compare bias, precision, and limits of agreement. Changes in blood glucose measurement were evaluated by four-quadrant plot and trend interchangeability methods (TIM). In the 23 patients analyzed, the CVC was used as part of standard care with no complications. The correlation coefficient for absolute values (N = 99) was R = 0.91 (P < 0.001). The bias, precision and limits of agreement were - 9.1, 17.4 and - 43.2 to 24.9 mg/dL, respectively. The concordance rate for changes in blood glucose measurements (N = 77) was 85% with the four-quadrant plot. The TIM showed that 14 (18%) changes of blood glucose measurements were uninterpretable. Among the remaining 63 (82%) interpretable changes, 23 (37%) were interchangeable, 13 (20%) were in the gray zone, and 27 (43%) were not interchangeable. Microdialysis using a CVC appears to provide imprecise absolute blood glucose values with risk of insulin misuse. Moreover, only one third of changes in blood glucose measurements were interchangeable with the reference method using the TIM.

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Perioperative non-invasive haemodynamic monitoring: Yes or not yet?

Fischer

Lorne

2016

Anaesthesia Critical Care & Pain Medicine

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Evaluation of cardiac output by 5 arterial pulse contour techniques using trend interchangeability method

Abstract: Supplemental Digital Content is available in the text

Cited by 28 publications

References 18 publications

Breath‐by‐breath oxygen uptake during running: Effects of different calculation algorithms

Breath‐by‐breath oxygen uptake during running: Effects of different calculation algorithms

Assessment of changes in blood glucose concentration with intravascular microdialysis

Perioperative non-invasive haemodynamic monitoring: Yes or not yet?

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