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Updated: Aug 12, 2026

Quantitative Autonomic Testing
Published on: July 19, 2011
Neurohormonal response to head-up tilt and its role in vasovagal syncope
D L Jardine1, I C Melton, I G Crozier
1Cardiology Department, Christchurch Hospital, New Zealand.
Abstract:
In a controlled study, 26 patients with a history of recurrent syncope were found to have increased arginine vasopressin, corticotrophin, and atrial natriuretic factor levels after 5 minutes of 60 degrees head-up tilt, long before they became hypotensive. The exaggerated neurohormonal response in these patients may indicate a greater sensitivity to central hypovolemia which may predispose to vasovagal syncope, mediated by the vasodilatory effects of atrial natriuretic factor or the sensitization of mechanoreceptors by arginine vasopressin.
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