Journal article
Disruption of the blood-brain barrier in cerebrum and brain stem during acute hypertension
The American journal of physiology, Vol.251(6 Pt 2), pp.H1171-H1175
12/1986
DOI: 10.1152/ajpheart.1986.251.6.H1171
PMID: 3098113
Abstract
The purpose of this study was to examine hemodynamic mechanisms of protection of the blood-brain barrier in the brain stem during acute hypertension. We used a new method to examine the microcirculation of the brain stem. Intravital fluorescent microscopy and fluorescein-labeled dextran were used to evaluate disruption of the blood-brain barrier during acute hypertension in rats. During control conditions, pressure (servo null) in arterioles (60 microns in diameter) was 50 +/- 2% (mean +/- SE) of systemic arterial pressure in the cerebrum and 67 +/- 1% of systemic arterial pressure in the brain stem (P less than 0.05 vs. cerebrum). In the cerebrum, pial venous pressure increased from 7 +/- 1 to 25 +/- 2 mmHg during acute hypertension, and there was marked disruption of the blood-brain barrier in venules (26 +/- 2 leaky sites). In contrast, in the brain stem, pial venous pressure increased from 4 +/- 1 to only 8 +/- 1 mmHg (P less than 0.05 vs. cerebrum), and there was minimal disruption of the blood-brain barrier in venules (1.5 +/- 0.6 leaky sites, P less than 0.05 vs. cerebrum). During acute hypertension, increases in blood flow (microspheres) were less in brain stem than in cerebrum. The findings suggest distribution of vascular resistance differs in the brain stem and cerebrum under control conditions, whereas large arteries account for a greater fraction of resistance in cerebrum; pial venous pressure increases less in brain stem than cerebrum during acute hypertension, so that the blood-brain barrier is protected.
Details
- Title: Subtitle
- Disruption of the blood-brain barrier in cerebrum and brain stem during acute hypertension
- Creators
- William G MayhanFrank M FaraciDonald D Heistad
- Resource Type
- Journal article
- Publication Details
- The American journal of physiology, Vol.251(6 Pt 2), pp.H1171-H1175
- DOI
- 10.1152/ajpheart.1986.251.6.H1171
- PMID
- 3098113
- NLM abbreviation
- Am J Physiol
- ISSN
- 0002-9513
- eISSN
- 2163-5773
- Publisher
- United States
- Grant note
- HL-7180 / NHLBI NIH HHS HL-14388 / NHLBI NIH HHS HL-35940 / NHLBI NIH HHS
- Language
- English
- Date published
- 12/1986
- Academic Unit
- Cardiovascular Medicine; Neuroscience and Pharmacology; Internal Medicine
- Record Identifier
- 9984040241602771
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