Key result
Syncopal episodes during standing or tilting were preceded by bradycardia, hypotension, and increased plasma adrenaline and vasopressin in all 5 subjects.
Observational (n=5)
Increases in plasma adrenaline may contribute to the vasodilatation and arterial hypotension observed during syncope.
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Adrenaline surge may precede vasovagal syncope; hypothesis-generating in 5 cases, no practice change.
Robinson et al. (1988) conducted an observational in Syncope (n=5). Standing or tilting was evaluated on Changes in plasma adrenaline, noradrenaline, and vasopressin concentrations. Syncopal episodes during standing or tilting were preceded by bradycardia, hypotension, and increased plasma adrenaline and vasopressin in all 5 subjects.
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