Key result
S-shaped modeling of arterio-mixed venous oxygen difference may improve noninvasive cardiac output estimation during exercise.
Why the study?
The increase in arterio-mixed venous oxygen content difference during incremental exercise testing may be better modelled by an S-shaped function than a linear increase to improve noninvasive cardiac output estimation.
Does an S-shaped function better model the arterio-mixed venous oxygen content difference for estimating cardiac output during exercise compared to a linear model?
Does an S-shaped function better model the arterio-mixed venous oxygen content difference for estimating cardiac output during exercise compared to a linear model?
Modeling the arterio-mixed venous oxygen content difference with an S-shaped function may improve noninvasive estimation of cardiac output during exercise.
Answers are grounded in this paper and cite their sources.
Hypothesis-generating for refined noninvasive cardiac output estimation; prospective trials needed before clinical adoption.
In 1997, Stringer, Hansen, and Wasserman developed a method for estimating cardiac output during incremental exercise testing. They observed that the arterio-mixed venous oxygen content difference increases linearly with the percentage of maximal O 2 consumption. This increase may be better modelled by an S-shaped function, the inflection point of which may be related to the first ventilatory threshold and the inflection point of the oxygen dissociation curve. This finding may help to improve the method.
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Burchert et al. (2023) studied Incremental exercise testing. S-shaped function modeling vs. Linear modeling was evaluated. Modeling the arterio-mixed venous oxygen content difference with an S-shaped function rather than a linear model may improve noninvasive estimation of cardiac output during exercise.
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