Document Detail


Salt and water balance in congestive heart failure.
MedLine Citation:
PMID:  2943141     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The majority of symptoms related to congestive heart failure (CHF) can be derived from the excessive accumulation of fluid in the body. The retention of fluid is the result of the activation of a complex system of compensatory mechanisms working on the kidneys and altering the hemodynamic situation in the body. The compensatory mechanisms are essentially the same as those activated in acute blood loss. The common denominator for CHF and acute blood loss is a decrease of the effective arterial blood volume (EABV), a parameter defined as blood volume in relation to vascular capacity. In the early stages of CHF there is an increased sympathoadrenergic tone, leading to a peripheral vasoconstriction and a decrease of blood flow to the kidneys. Due to a preferential constriction of the efferent arterioles, the filtration fraction is increased and the glomerular filtration rate remains unchanged. However, there is an increased colloid osmotic pressure and a decreased intravascular hydrostatic pressure in the peritubular capillaries. These alterations result in an increased reabsorption of sodium and water in the kidneys. Furthermore, the blood flow in the kidneys is rerouted from the cortical to the juxtamedullary nephrons, which have larger glomeruli and longer loops of Henle. This will further increase the retention of salt and water. The renin-angiotensin-aldosterone (R-A-A) system is also activated due to the decrease of EABV. Angiotensin II exerts about the same effects as norepinephrine--vasoconstriction, rerouting of blood within the kidney and preferential vasoconstriction of the efferent arterioles--all changes contributing to the retention of salt and water.(ABSTRACT TRUNCATED AT 250 WORDS)
Authors:
T Dyckner; P O Wester
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Acta medica Scandinavica. Supplementum     Volume:  707     ISSN:  0365-463X     ISO Abbreviation:  Acta Med. Scand. Suppl.     Publication Date:  1986  
Date Detail:
Created Date:  1986-09-17     Completed Date:  1986-09-17     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0370331     Medline TA:  Acta Med Scand Suppl     Country:  SWEDEN    
Other Details:
Languages:  eng     Pagination:  27-31     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Arginine Vasopressin / metabolism
Atrial Natriuretic Factor / metabolism
Blood Volume
Edema / metabolism
Extracellular Space / metabolism
Glomerular Filtration Rate
Heart Failure / metabolism*
Humans
Renal Circulation
Renin-Angiotensin System
Sodium Chloride / metabolism*
Water-Electrolyte Balance*
Chemical
Reg. No./Substance:
113-79-1/Arginine Vasopressin; 7647-14-5/Sodium Chloride; 85637-73-6/Atrial Natriuretic Factor

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


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