AustralieFrV1, Main, Exploration, bibRecord, 00B929

Acute and chronic alterations in blood pressure variability following experimental subarachnoid haemorrhage

Identifieur interne : 00B929 ( Main/Exploration ); précédent : 00B928; suivant : 00B930

Acute and chronic alterations in blood pressure variability following experimental subarachnoid haemorrhage

Auteurs : Céline Fassot [France] ; Elisabeth Lambert [Australie] ; Gavin Lambert [Australie] ; Peter Friberg [Suède] ; Jean-Luc Elghozi [France]

Source :

Regulatory Peptides [ 0167-0115 ] ; 2001.

RBID : ISTEX:2480CAF044CFFADB266C2CEDE51A3DF39DC98A7A

Descripteurs français

Pascal (Inist)
- Aigu, Animal, Chronique, Hémorragie, Pathologie expérimentale, Pression sanguine, Rat, Sousarachnoïdien, Système renin angiotensine, Vasopressine.

English descriptors

Abstract

Abstract: This study examined the role of the renin–angiotensin and vasopressin systems on systolic blood pressure (SBP) variability following subarachnoid haemorrhage (SAH) in conscious rats. Animals received no treatment, the angiotensin II AT1 receptor antagonist, losartan, or the vascular vasopressin receptor antagonist, AVPX. SAH resulted in a transient sympathetic activation as estimated from the increase in the mid-frequency oscillations of SBP (3.2±0.8 mm Hg2, 3 hours after the injury vs. 1.3±0.3 mm Hg2 in control conditions, p<0.01). On the second and fourth day following SAH, a marked elevation in the low-frequency component of SBP was observed (7.1±1.0 mm Hg2 on day 2 vs. 2.6±0.3 mm Hg2 in control conditions, p<0.001 and 6.3±1.1 mm Hg2 on day 4 vs. 2.6±0.3 mm Hg2 in control conditions, p<0.01). Pre-treatment with losartan prevented the acute rise in the mid-frequency oscillations in SBP and partially reduced the low-frequency component observed at 2 and 4 days. Administration of AVPX on the second and fourth day following SAH normalised the elevated low-frequency oscillations in SBP. This study indicates that the modifications in SBP variability observed in the early and delayed stage after subarachnoid haemorrhage involve angiotensin II. Vasopressin seems to be implicated in the delayed development of low-frequency fluctuations of SBP.

Url:

https://api.istex.fr/document/2480CAF044CFFADB266C2CEDE51A3DF39DC98A7A/fulltext/pdf

DOI: 10.1016/S0167-0115(01)00217-8

Affiliations:

Le document en format XML

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<front><div type="abstract" xml:lang="en">Abstract: This study examined the role of the renin–angiotensin and vasopressin systems on systolic blood pressure (SBP) variability following subarachnoid haemorrhage (SAH) in conscious rats. Animals received no treatment, the angiotensin II AT1 receptor antagonist, losartan, or the vascular vasopressin receptor antagonist, AVPX. SAH resulted in a transient sympathetic activation as estimated from the increase in the mid-frequency oscillations of SBP (3.2±0.8 mm Hg2, 3 hours after the injury vs. 1.3±0.3 mm Hg2 in control conditions, p<0.01). On the second and fourth day following SAH, a marked elevation in the low-frequency component of SBP was observed (7.1±1.0 mm Hg2 on day 2 vs. 2.6±0.3 mm Hg2 in control conditions, p<0.001 and 6.3±1.1 mm Hg2 on day 4 vs. 2.6±0.3 mm Hg2 in control conditions, p<0.01). Pre-treatment with losartan prevented the acute rise in the mid-frequency oscillations in SBP and partially reduced the low-frequency component observed at 2 and 4 days. Administration of AVPX on the second and fourth day following SAH normalised the elevated low-frequency oscillations in SBP. This study indicates that the modifications in SBP variability observed in the early and delayed stage after subarachnoid haemorrhage involve angiotensin II. Vasopressin seems to be implicated in the delayed development of low-frequency fluctuations of SBP.</div>
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Acute and chronic alterations in blood pressure variability following experimental subarachnoid haemorrhage

Acute and chronic alterations in blood pressure variability following experimental subarachnoid haemorrhage

Source :

Descripteurs français

English descriptors

Abstract

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