Document Detail


Abnormal distal tubular sodium reabsorption during dopamine infusion in patients with essential hypertension evaluated by the lithium clearance methods.
MedLine Citation:
PMID:  9181277     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The effects of low-dose dopamine infusion on renal hemodynamics, tubular function estimated by the lithium clearance technique and plasma levels of angiotensin II (Ang II), aldosterone (Aldo), atrial natriuretic peptide (ANP) and arginine vasopressin (AVP) were studied in 11 patients with essential hypertension (HT) and in 10 healthy control subjects (CS). Antihypertensive treatment was terminated at least 2 weeks prior to examination. Dopamine (2 micrograms/kg/min) was infused for two hours. Before dopamine infusion all measured parameters, but blood pressure, did not deviate significantly between the two groups, including 24 h urinary sodium excretion prior to investigation (HT: 166.9 mmol/24 h vs. CS: 183.4 mmol/24 h, medians). Dopamine infusion resulted in an exaggerated natriuresis in the HT group when compared with the CS group; sodium excretion: (HT: from 260 to 759 mumol/min vs. CS: from 255 to 432 mumol/min, p < 0.01) and fractional sodium excretion: (HT: from 1.6 to 4.2% vs. CS: from 1.6 to 2.4%, p < 0.01 median values). Distal fractional sodium reabsorption was significantly lower in the HT patients (HT: from 94.0 to 88.5% vs. CS: from 94.0 to 91.6%, p < 0.01). ANP decreased significantly only in the HT group (HT: from 4.8 to 3.5 pmol/l vs. CS: from 3.2 to 3.4 pmol/l, p < 0.01). Renal hemodynamics, blood pressure, urinary output, Ang II, Aldo, and AVP were changed to the same degree or unchanged in both groups. It is concluded that the exaggerated natriuretic response seen in patients with essential hypertension during low-dose dopamine infusion probably is due to a enhanced dopamine sensitivity mainly in the distal parts of the nephron.
Authors:
C B Nielsen; E B Pedersen
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Publication Detail:
Type:  Clinical Trial; Controlled Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Clinical nephrology     Volume:  47     ISSN:  0301-0430     ISO Abbreviation:  Clin. Nephrol.     Publication Date:  1997 May 
Date Detail:
Created Date:  1997-07-30     Completed Date:  1997-07-30     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0364441     Medline TA:  Clin Nephrol     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  304-9     Citation Subset:  IM    
Affiliation:
Research Laboratory for Nephrology & Hypertension, University Hospital of Aarhus, Skejby Hospital, Denmark.
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MeSH Terms
Descriptor/Qualifier:
Adult
Aldosterone / blood
Angiotensin II / blood
Arginine Vasopressin / blood
Atrial Natriuretic Factor / blood
Dopamine / administration & dosage*
Female
Glomerular Filtration Rate
Heart Rate
Hemodynamics
Humans
Hypertension, Renal / drug therapy,  physiopathology*
Kidney Tubules, Distal / drug effects,  physiopathology*
Lithium / diagnostic use
Male
Middle Aged
Natriuresis / drug effects*
Renal Circulation
Sodium / metabolism*
Urination
Chemical
Reg. No./Substance:
11128-99-7/Angiotensin II; 113-79-1/Arginine Vasopressin; 52-39-1/Aldosterone; 7439-93-2/Lithium; 7440-23-5/Sodium; 85637-73-6/Atrial Natriuretic Factor

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


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