Why the study?
How do haemodynamic and catecholamine responses to supine exercise and upright posture differ between subjects with vasovagal syncope, pure autonomic failure, and normal controls?
How do haemodynamic and catecholamine responses to supine exercise and upright posture differ between subjects with vasovagal syncope, pure autonomic failure, and normal controls?
Subjects with vasovagal syncope exhibit distinct haemodynamic and catecholamine responses to exercise, suggesting an underlying abnormality that may predispose them to vasodepression.
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Distinct responses to supine exercise in vasovagal syncope may reflect vasodepressor predisposition; hypothesis-generating and requires prospective validation.
Smith et al. (1996) studied this question.
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