Document Detail


Blood pressure variability in established L-NAME hypertension in rats.
MedLine Citation:
PMID:  10608464     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
METHODS: Blood pressure variability was evaluated in conscious Wistar control rats and rats with established L-NAME hypertension (20 mg/kg per 24 h, 4 weeks). RESULTS: Final systolic arterial pressure was 185+/-5 and 132+/-4 mm Hg in the Nomega-nitro-L-arginine methyl ester (L-NAME)-treated and control rats, respectively. The standard deviation of systolic arterial pressure in the L-NAME group was 70% greater than in the control rats, indicating a significant increase in the overall variability. Arterial pressure in the L-NAME rats exhibited aperiodical, abrupt rises and falls and data was grossly non-stationary. Blood pressure variability was therefore evaluated using Poincaré plot analysis. The variance of the difference (delta) between two successive values of systolic arterial pressure, determined for time intervals of 0.2 to 5 s (0.2 s increment), was always significantly higher in the L-NAME group compared with untreated animals. The variance of delta systolic arterial pressure increased with the time interval and plateaued for time intervals of 2.4 and 1.4 s in hypertensive and normotensive rats, respectively. These differences vanished when the sudden events oberved in L-NAME rats were omitted in the construction of Poincaré plots. Acute administration of prazosin (1 mg/kg), but not losartan (10 mg/kg) markedly reduced the variance of delta systolic arterial pressure in hypertensive rats. CONCLUSIONS: Nitric oxide participates in the control of arterial pressure variability. The sympathetic nervous system seems to be a major determinant of the increased short-term variability of arterial pressure in this model.
Authors:
J Blanc; P Ponchon; D Laude; J L Elghozi; B Jover
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of hypertension     Volume:  17     ISSN:  0263-6352     ISO Abbreviation:  J. Hypertens.     Publication Date:  1999 Nov 
Date Detail:
Created Date:  2000-01-05     Completed Date:  2000-01-05     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  8306882     Medline TA:  J Hypertens     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1527-34     Citation Subset:  IM    
Affiliation:
Laboratoire de Pharmacologie, CNRS, UMR8604, Faculté de Médecine, Necker, Paris, France.
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MeSH Terms
Descriptor/Qualifier:
Animals
Antihypertensive Agents / pharmacology
Blood Pressure* / drug effects
Enzyme Inhibitors*
Hypertension / chemically induced*,  physiopathology*
Losartan / pharmacology
Male
NG-Nitroarginine Methyl Ester*
Prazosin / pharmacology
Rats
Rats, Wistar
Time Factors
Chemical
Reg. No./Substance:
0/Antihypertensive Agents; 0/Enzyme Inhibitors; 114798-26-4/Losartan; 19216-56-9/Prazosin; 50903-99-6/NG-Nitroarginine Methyl Ester

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


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