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Clinical Autonomic Research
Published in: Clinical Autonomic Research 1/2024

02-02-2024 | Vasovagal Syncope | Letter to the Editor

What lies beneath: cyclical giant bursts of SNA during vasovagal syncope

Author: D. L. Jardine

Published in: Clinical Autonomic Research | Issue 1/2024

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Excerpt

Rapid sympathetic control of vasoconstriction, modulated by baroreflex feed-back, is essential for the maintenance of blood pressure (BP) during exercise, postural change and hypovolemia [1]. During vasovagal syncope (VVS), the baroreflexes fail and most recordings show bradycardia with decreased frequency of muscle sympathetic nerve activity (MSNA) [2]. The fall in MSNA is probably secondary to decreased generation of sympathetic nerve activity (SNA) in the rostral ventrolateral medulla which is resolves as blood pressure recovers and baroreflex function returns. Any SNA observed during VVS may be driven by other (non-baroreflex) pathways in the brainstem. …
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Metadata
Title
What lies beneath: cyclical giant bursts of SNA during vasovagal syncope
Author
D. L. Jardine
Publication date
02-02-2024
Publisher
Springer Berlin Heidelberg
Published in
Clinical Autonomic Research / Issue 1/2024
Print ISSN: 0959-9851
Electronic ISSN: 1619-1560
DOI
https://doi.org/10.1007/s10286-023-01009-w

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