Why the study?
Does 40° head-up tilt alter the relationship between QT interval variability and muscle sympathetic nerve activity in healthy subjects?
Population
10 healthy subjects
Comparison
40° head-up tilt vs Supine position
Design
Other
Authors
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QT variability should not serve as a surrogate for sympathetic activity at moderate activation; leaves open its utility in disease states.
Does 40° head-up tilt alter the relationship between QT interval variability and muscle sympathetic nerve activity in healthy subjects?
Beat-to-beat QT interval variability does not appear to be a useful surrogate for cardiac sympathetic nerve activity at moderate levels of activation.
El-Hamad et al. (2015) studied this question.
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