Document Detail


Inhibitory effect of atrial natriuretic factor on sympathetic ganglionic neurotransmission in humans.
MedLine Citation:
PMID:  7653663     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
I have previously documented an inhibitory effect of atrial natriuretic factor (ANF) on postganglionic muscle sympathetic nerve activity (MSNA) in normal subjects that was consistent with either a central or ganglionic sympathoinhibitory action. To test the latter hypothesis, I examined, in seven young normotensive men, the effect of saline (as vehicle) and ANF (50 micrograms, then 50 ng.kg-1.min-1), given on 2 separate days according to a random double-blind study design, on blood pressure, heart rate, and MSNA before and after ganglionic neurotransmission was stimulated with edrophonium (ED; 12 mg iv), a rapidly reversible acetylcholinesterase inhibitor without central nervous system effects, and during subsequent augmentation of central sympathetic outflow by a cold pressor test (CPT). In five of these subjects, the protocol was replicated during nitroprusside infusion (0.4 micrograms.kg-1.min-1). ED increased MSNA during vehicle (P < 0.005) and nitroprusside (P < 0.003) but not during ANF infusion. The sympathoneural response to the combined stimuli of ED and CPT was also attenuated by ANF compared with either saline or nitroprusside infusions. Conclusions were that 1) postganglionic MSNA is increased by ED, 2) this facilitative effect of ED is attenuated by ANF, and 3) modulation of ganglionic neurotransmission is one mechanism for the relative sympatho-inhibition observed when ANF is infused at this dose.
Authors:
J S Floras
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Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American journal of physiology     Volume:  269     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1995 Aug 
Date Detail:
Created Date:  1995-09-22     Completed Date:  1995-09-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  R406-12     Citation Subset:  IM    
Affiliation:
Division of Cardiology, Toronto Hospital, Ontario, Canada.
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MeSH Terms
Descriptor/Qualifier:
Adult
Atrial Natriuretic Factor / pharmacology*
Blood Pressure / drug effects
Double-Blind Method
Edrophonium / pharmacology
Electrophysiology
Ganglia, Sympathetic / drug effects*
Heart Rate / drug effects
Humans
Male
Muscles / innervation
Nitroprusside / pharmacology
Synaptic Transmission / drug effects*
Chemical
Reg. No./Substance:
15078-28-1/Nitroprusside; 312-48-1/Edrophonium; 85637-73-6/Atrial Natriuretic Factor

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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