| A new model of concussive brain injury in the cat produced by extradural fluid volume loading: II. Physiological and neuropathological observations. | |
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MedLine Citation:
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PMID: 3454676 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This study examined physiological and histopathological changes in the cat produced by a new experimental fluid injury device. Spontaneously breathing (N = 14) and artificially ventilated (N = 45) cats were subjected to systemically varied magnitudes of fluid percussion brain injury. Within certain injury ranges, increasing magnitudes of fluid percussion injury produced increasing durations of apnea, as well as greater transient increases in mean arterial blood pressure, intracranial pressure and cerebral perfusion pressure. Acute increases in intracranial pressure may have been related to cerebral vasodilatation produced by the systemic hypertension following brain injury. Injuries associated with pressure transients greater than 10 atm ms produced concussive responses, including irreversible apnea in spontaneously breathing cats and temporary pupillary dilatation, increases in heart rate and mean arterial blood pressure in artificially ventilated cats. Injuries greater than 39 atm ms frequently produced histopathological and physiological indices of significant irreversible brain damage, including fixed and dilated pupils, systemic cardiovascular hypotension and deteriorating blood gases. Injury magnitudes less than 20 atm ms did not produce macroscopic evidence of histopathology, intermediate injury ranges produced increasing evidence of subarachnoid and petechial hemorrhage while injury levels greater than 40 atm ms frequently produced significant histopathology including massive hematomas. Injury greater than 10 atm ms resulted in opening of the blood-brain barrier, as assessed by extravasation of horseradish peroxidase. Injury greater than 19 atm ms produced suppression of EEG amplitudes which did not recover for up to 40 minutes after injury. These data provide detailed information on the physiological and histopathological consequences of fluid percussion injury in the cat and indicate that this modified fluid percussion apparatus can produce graded levels of brain injury similar to those previously reported for fluid percussion injury. |
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Authors:
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R L Hayes; D Stalhammar; J T Povlishock; A M Allen; B J Galinat; D P Becker; H H Stonnington |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Brain injury : [BI] Volume: 1 ISSN: 0269-9052 ISO Abbreviation: Brain Inj Publication Date: 1987 Jul-Sep |
Date Detail:
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Created Date: 1988-10-06 Completed Date: 1988-10-06 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 8710358 Medline TA: Brain Inj Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 93-112 Citation Subset: IM |
Affiliation:
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Richard Roland Reynolds Neurosurgical Research Laboratories, Department of Surgery, Medical College of Virginia, Virginia Commonwealth University, Richmond 23298-0001. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Biomechanics Blood Pressure Brain / pathology, physiopathology* Brain Concussion / etiology*, physiopathology Cats Electroencephalography Female Fluid Therapy / instrumentation Heart Rate Humans Intracranial Pressure* Male Reflex, Pupillary |
| Grant Support | |
ID/Acronym/Agency:
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NS 12587/NS/NINDS NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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