| Effect of cerebral perfusion pressure on cerebral cortical microvascular shunting at high intracranial pressure in rats. | |
| | |
MedLine Citation:
|
PMID: 23204051 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
BACKGROUND AND PURPOSE: Recently, we showed that decreasing cerebral perfusion pressure (CPP) from 70 mm Hg to 50 mm Hg and 30 mm Hg by increasing intracranial pressure (ICP) with a fluid reservoir induces a transition from capillary (CAP) to microvascular shunt (MVS) flow in the uninjured rat brain. This transition was associated with tissue hypoxia, increased blood-brain barrier (BBB) permeability, and brain edema. Our aim was to determine whether an increase in CPP would attenuate the transition to MVS flow at high ICP. METHODS: Rats were subjected to progressive, step-wise increases in ICP of up to 60 mm Hg by an artificial cerebrospinal fluid reservoir connected to the cisterna magna. CPP was maintained at 50, 60, 70, or 80 mm Hg by intravenous dopamine infusion. Microvascular red blood cell flow velocity, BBB integrity (fluorescein dye extravasation), and tissue oxygenation (nicotinamide adenine dinucleotide) were measured by in vivo 2-photon laser scanning microscopy. Doppler cortical flux, rectal and cranial temperatures, ICP, arterial blood pressure, and gases were monitored. RESULTS: The CAP/MVS ratio increased (P<0.05) at higher ICP as CPP was increased from 50 to 80 mm Hg. At an ICP of 30 mm Hg and CPP of 50 mm Hg, the CAP/MVS ratio was 0.6±0.1. At CPP of 60, 70, and 80 mm Hg, the ratio increased to 0.9±0.1, 1.4±0.1, and 1.9±0.1, respectively (mean±SEM; P<0.05). BBB opening and increase of reduced form of nicotinamide adenine dinucleotide occurred at higher ICP as CPP was increased. CONCLUSIONS: Increasing CPP at high ICP attenuates the transition from CAP to MVS flow, development of tissue hypoxia, and increased BBB permeability. |
| | |
Authors:
|
Denis E Bragin; Rachel C Bush; Edwin M Nemoto |
Publication Detail:
|
Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't Date: 2012-11-29 |
Journal Detail:
|
Title: Stroke; a journal of cerebral circulation Volume: 44 ISSN: 1524-4628 ISO Abbreviation: Stroke Publication Date: 2013 Jan |
Date Detail:
|
Created Date: 2012-12-25 Completed Date: 2013-02-18 Revised Date: 2013-04-16 |
Medline Journal Info:
|
Nlm Unique ID: 0235266 Medline TA: Stroke Country: United States |
Other Details:
|
Languages: eng Pagination: 177-81 Citation Subset: IM |
Affiliation:
|
Department of Neurosurgery, University of New Mexico School of Medicine, 1 University of New Mexico MSC10-5615, Albuquerque, NM 87131, USA. dbragin@salud.unm.edu |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Animals Blood Flow Velocity / physiology Blood-Brain Barrier / physiology Cerebral Cortex / blood supply*, physiology* Cerebrovascular Circulation / physiology* Intracranial Hypertension / physiopathology* Intracranial Pressure / physiology* Male Microcirculation / physiology* Rats Rats, Sprague-Dawley |
| Grant Support | |
ID/Acronym/Agency:
|
COBRE8P30GM103400-01/GM/NIGMS NIH HHS; NS061216/NS/NINDS NIH HHS; R03 NS061216/NS/NINDS NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Familial Intracranial Aneurysms: Is Anatomic Vulnerability Heritable?
Next Document: MR-DWI-Positive Lesions and Symptomatic Ischemic Complications After Coiling of Unruptured Intracran...