Key result
Passive head-up tilt elicited highly reproducible changes in stroke volume, cardiac output, and heart rate, whereas blood pressure changes were only modestly reproducible.
Observational
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Modest BP reproducibility during tilt limits its use as a risk marker; leaves open optimal multi-parameter protocols for research.
We examined the reproducibility of hemodynamic responses to three passive head-up tilts. The associated changes in stroke volume, cardiac output, and heart rate were highly reproducible. Systemic vascular resistance showed moderate reproducibility, whereas blood pressure changes during upright posture were modestly reproducible. If an exaggerated blood pressure response to upright posture is a cardiovascular risk factor, it is likely attributed to other hemodynamic variables that exhibit more reproducible posture-related changes.
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Bouquin et al. (2025) reported an observational. Passive head-up tilt was evaluated on Reproducibility of hemodynamic responses. Passive head-up tilt elicited highly reproducible changes in stroke volume, cardiac output, and heart rate, whereas blood pressure changes were only modestly reproducible.
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