Why the study?
Does increased adrenergic activity alter the relationship between electrical (QT) and mechanical (QS2) systole?
Population
44 subjects (12 normal subjects and 32 patients)
Comparison
Adrenergic stimulation and atrial pacing vs Baseline/control state or lower adrenergic state
Design
Other
Authors
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QT > QS2 may flag heightened adrenergic activity; leaves open its value as a simple index pending confirmatory studies.
Does increased adrenergic activity alter the relationship between electrical (QT) and mechanical (QS2) systole?
A reversal of the normal QT-QS2 relationship (QT > QS2) may serve as a simple, non-invasive index of increased adrenergic activity.
Boudoulas et al. (1981) studied this question.
Synapse has enriched 3 closely related papers on similar clinical questions. Consider them for comparative context: