Population
12 patients with vasovagal syncope (VVS), mean age 37 (range 18-75) years, 6 men
Design
Case_series
Authors
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Sympathetic hyporesponsiveness may contribute to vasovagal syncope; hypothesis-generating and should not yet change practice.
Patients with vasovagal syncope often exhibit normal vagal responsiveness but sympathetic hyporesponsiveness, suggesting inadequate vasoconstriction plays an early role in the condition.
Berg et al. (1997) studied this question.
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