Why the study?
Do sitting and standing postures alter time-based noninvasive measurements of ventricular performance compared to the supine posture?
Cross-Sectional
Blinded measurement and calculation
Do sitting and standing postures alter time-based noninvasive measurements of ventricular performance compared to the supine posture?
Postural changes significantly affect noninvasive baseline measurements of ventricular performance, primarily driven by decreased venous return, which must be accounted for in clinical assessments.
Answers are grounded in this paper and cite their sources.
Standardize posture for noninvasive ventricular performance measurements; leaves open posture-specific reference norms.
The effects of posture on time-based noninvasive measurements were determined utilizing the sequence supine-sitting-standing in a formal protocol in which observer biases were eliminated by blinding the measurement and calculation phases. Compared to the supine posture, the sitting and standing postures produced significant increases in heart rate, isovolumic contraction time, pre-ejection period and pre-ejection periog/left-ventricular ejection time and significant decreases in ejection time and ejection time index. The response patterns are consistent with their hemodynamic correlates cited in the literature which show increased adrenergic activity and decreased venous return in the sitting and standing postures, the effect on venous return being dominant.
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Lance et al. (2008) reported a cross-sectional. Sitting and standing postures vs. Supine posture was evaluated on Time-based noninvasive measurements of ventricular performance.
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