Document Detail


Attenuated natriuretic response to adrenomedullin in experimental heart failure.
MedLine Citation:
PMID:  11264553     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: The recently discovered vasodilating and positive inotropic peptide, adrenomedullin (ADM), has strong natriuretic actions. ADM-induced natriuresis is caused by an increase in glomerular filtration rate and a decrease in distal tubular sodium reabsorption. Although ADM is activated in human and experimental heart failure, the role of ADM in the kidney in heart failure remains undefined. METHODS AND RESULTS: The present study was performed to determine the renal hemodynamic and urinary excretory actions of exogenously administered ADM in a canine model of acute heart failure produced by rapid ventricular pacing. Experimental acute heart failure was characterized by a decrease in cardiac output and an increase in pulmonary capillary wedge pressure with an increase in plasma ADM concentration. Intrarenal infusion of ADM (1 and 25 ng/kg/min) induced an increase in urinary sodium excretion in the normal control dogs (change in urinary sodium excretion [Delta UNaV], +94.5 microEq/min during 1 ng/kg/min ADM infusion and +128.1 microEq/min during 25 ng/kg/min ADM infusion). In the acute heart failure dogs, intrarenal ADM infusion resulted in an attenuated increase in urinary sodium excretion (Delta UNaV, +44.8 microEq/min during 1 ng/kg/min ADM infusion and +51.8 microEq/min during 25 ng/kg/min ADM infusion). Both glomerular and tubular actions of ADM were attenuated in the acute heart failure group compared with responses in the normal control group. CONCLUSION: The present study shows that the renal natriuretic responses to ADM are markedly attenuated in experimental acute heart failure. This study provides insight into humoral mechanisms that may promote sodium retention in heart failure via a renal hyporesponsiveness to natriuretic actions of ADM.
Authors:
M Jougasaki; D M Heublein; S M Sandberg; J C Burnett
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of cardiac failure     Volume:  7     ISSN:  1071-9164     ISO Abbreviation:  J. Card. Fail.     Publication Date:  2001 Mar 
Date Detail:
Created Date:  2001-03-26     Completed Date:  2001-05-21     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  9442138     Medline TA:  J Card Fail     Country:  United States    
Other Details:
Languages:  eng     Pagination:  75-83     Citation Subset:  IM    
Affiliation:
Cardiorenal Research Laboratory, Division of Cardiovascular Diseases, Mayo Clinic and Foundation, Rochester, Minnesota 55905, USA.
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MeSH Terms
Descriptor/Qualifier:
Adrenomedullin
Animals
Attention / drug effects*,  physiology*
Disease Models, Animal
Dogs
Heart Failure / blood,  physiopathology*
Hemodynamics / drug effects*,  physiology*
Infusions, Intravenous
Kidney / drug effects,  metabolism*,  physiology
Natriuresis
Natriuretic Agents / metabolism*,  physiology*
Peptides / administration & dosage*,  blood*
Grant Support
ID/Acronym/Agency:
HL 36634/HL/NHLBI NIH HHS
Chemical
Reg. No./Substance:
0/Natriuretic Agents; 0/Peptides; 148498-78-6/Adrenomedullin

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


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