Cited by 63Cardiovascular Syncope and Autonomic DisordersHeart Rate Variability and Autonomic ControlCardiovascular and exercise physiology

Abnormality of superior mesenteric artery blood flow responses in human sympathetic failure.

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Chaudhuri, K R, Thomaides, T, Mathias, C J·1992·The Journal of Physiology

Abstract

1. Systemic and regional haemodynamic responses, including superior mesenteric artery blood flow, were measured during stimuli which increase sympatho‐neural activity in age‐matched normal subjects (controls) and in two groups of patients with sympathetic failure (pure autonomic failure and multiple system atrophy). The stimuli included the pressor tests (mental arithmetic, cutaneous cold and isometric exercise) and head‐up tilt. 2. In the controls, the blood pressure did not rise in some during mental arithmetic, but rose in all subjects during cutaneous cold and isometric exercise and was maintained during head‐up tilt. In sympathetic failure patients, blood pressure was unchanged during each pressor test and fell during head‐up tilt. 3. In the controls, superior mesenteric artery blood flow did not fall significantly during mental arithmetic but fell (with a corresponding rise in calculated superior mesenteric artery vascular resistance), during cutaneous cold, isometric exercise and head‐up tilt. In sympathetic failure patients, there were no changes in superior mesenteric artery blood flow and vascular resistance during the pressor tests and head‐up tilt. 4. There were no changes in cardiac index or forearm blood flow during each pressor test in both controls and patients. Cardiac index fell and forearm vascular resistance rose during head‐up tilt in the controls only. 5. In conclusion, active constriction of the superior mesenteric artery occurs in normal subjects during sympatho‐neural activation induced by stimuli such as cutaneous cold, isometric exercise and head‐up tilt. This does not occur in patients with sympathetic failure and probably contributes to postural hypotension, emphasizing the role of the splanchnic vascular bed in overall blood pressure control. This study confirms the necessity of integrity of sympathetic pathways in the neural control of the splanchnic vascular bed.

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Registry

Crossref · 10.1113/jphysiol.1992.sp019388

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27 of 27 references verified0 citation errors · 0 not checkable

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  • In autonomic failure patients, increased blood sequestration in the splanchnic circulation is related to release of vasoactive gut hormones.

    “In these patients, the increased blood sequestration in the splanchnic circulation is related to the release of vasoactive gut hormones.”
  • In patients with autonomic failure, active vasoconstriction of the superior mesenteric artery after a sympathetic stimulus does not occur, which may contribute to post-prandial hypotension.

    “Chaudhuri et al., [15] showed that in patients with autonomic failure, active vasoconstriction of the superior mesenteric artery (SMA) after a sympathetic stimulus does not occur which could contribute to the post-prandial hypotension.”

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Authors
Chaudhuri, K. R., Thomaides, T., & Mathias, C. J.
Affiliations
St Mary's Hospital (GB)
Venue
The Journal of Physiology
Publisher
Wiley
Published
1992-11
Volume
457
Issue
1
Pages
477-489
ISSN
  • 0022-3751 (ISSN-L)
  • 1469-7793
OpenAlex
W2086947335
Cited by
63
References
27
Citations by year
2025: 1 · 2024: 3 · 2022: 1 · 2021: 2 · 2018: 3 · 2017: 1 · 2016: 1 · 2015: 1 · 2014: 1 · 2013: 1 · 2012: 4
FWCI
4.40
Type
journal article
Language
en
Open access
Locations
  • The Journal of Physiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Wellcome Trust
Topics
  • Health Sciences › Medicine › Surgery › Cardiovascular Syncope and Autonomic Disorders
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Heart Rate Variability and Autonomic Control
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
Keywords
superior mesenteric artery blood flow, pure autonomic failure, multiple system atrophy, orthostatic hypotension, head-up tilt, isometric exercise, mental arithmetic, vascular resistance, blood pressure regulation
MeSH terms
Adult, Aged, Autonomic Nervous System Diseases, Blood Pressure, Cold Temperature, Humans, Middle Aged, Regional Blood Flow, Stress, Psychological, Sympathetic Nervous System, Vascular Resistance, Exercise, Mesenteric Artery, Superior

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