Document Detail


Blood pressure in haemodialysis patients: the importance of the relationship between the renin-angiotensin-aldosterone system, salt intake and extracellular volume.
MedLine Citation:
PMID:  15136968     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This review outlines the major mechanisms for control of blood pressure (BP) in individuals with renal failure on haemodialysis. Dietary salt stimulates thirst and, thereby, greater fluid intake with excessive fluid gain between dialysis sessions and chronic expansion of extracellular volume. At the same time, this volume expansion often fails to suppress the renin-angiotensin system (RAS) appropriately and this inevitably leads to high BP in the majority of individuals on haemodialysis. A greater understanding of the mechanisms involved leads to more rational treatment and better BP control. This can be achieved by careful measurement of BP before and after dialysis, allowing time for the equilibration of extracellular fluid shifts that occur after dialysis, combined with measurements of plasma renin activity. It is relatively easy to then decide how the high BP should be treated: either by removal of excess volume by gradual ultrafiltration combined with restriction of salt intake to help prevent thirst and excessive fluid gain between dialyses, or by inhibition of the RAS, or by a combination of both. In those individuals who are unable to adequately reduce their dietary salt intake and still continue to gain large amounts of weight between dialysis, and are resistant to reducing their pre-dialysis weight, calcium antagonists may help to lower BP, either alone or in combination with RAS blockade. However, the BP often remains resistant to treatment unless they can be persuaded to reduce their salt intake.
Authors:
Timothy W R Doulton; Graham A MacGregor
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Journal of the renin-angiotensin-aldosterone system : JRAAS     Volume:  5     ISSN:  1470-3203     ISO Abbreviation:  J Renin Angiotensin Aldosterone Syst     Publication Date:  2004 Mar 
Date Detail:
Created Date:  2004-05-11     Completed Date:  2004-10-19     Revised Date:  2005-11-16    
Medline Journal Info:
Nlm Unique ID:  100971636     Medline TA:  J Renin Angiotensin Aldosterone Syst     Country:  England    
Other Details:
Languages:  eng     Pagination:  14-22     Citation Subset:  IM    
Affiliation:
Blood Pressure Unit, St George's Hospital Medical School, London, SW17 0RE, UK.
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MeSH Terms
Descriptor/Qualifier:
Blood Pressure*
Dose-Response Relationship, Drug
Extracellular Fluid / metabolism*
Humans
Renal Dialysis*
Renin-Angiotensin System*
Sodium Chloride, Dietary / administration & dosage*
Chemical
Reg. No./Substance:
0/Sodium Chloride, Dietary

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


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