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Severity Profile of Penetrating Ballistic-Like Brain Injury on Neurofunctional Outcome, Blood–Brain Barrier Permeability, and Brain Edema Formation
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Severity Profile of Penetrating Ballistic-Like Brain Injury on Neurofunctional Outcome, Blood–Brain Barrier Permeability, and Brain Edema Formation
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Journal Article
Severity Profile of Penetrating Ballistic-Like Brain Injury on Neurofunctional Outcome, Blood–Brain Barrier Permeability, and Brain Edema Formation
2011
Overview
This study evaluated the injury severity profile of unilateral, frontal penetrating ballistic-like brain injury (PBBI) on neurofunctional outcome, blood–brain barrier (BBB) permeability, and brain edema formation. The degree of injury severity was determined by the delivery of a water-pressure pulse designed to produce a temporary cavity by rapid (<40 ms) expansion of the probe's elastic balloon calibrated to equal 5%, 10%, 12.5%, or 15% of total rat brain volume (control groups consisted of sham surgery or insertion of the probe only). Neurofunctional assessments revealed motor and cognitive deficits related to the degree of injury severity, with the most clear-cut profile of PBBI injury severity depicted by the Morris water maze (MWM) results. A biphasic pattern of BBB leakage was detected in the injured hemisphere at all injury severity levels at 4 h post-injury, and again at 48–72 h post-injury, which remained evident out to 7 days post-PBBI in the 10% and 12.5% PBBI groups. Likewise, significant brain edema was detected in the injured hemisphere by 4 h post-injury and remained elevated out to 7 days post-injury in the 10% and 12.5% PBBI groups. However, following 5% PBBI, significant levels of edema were only detected from 24 h to 48h post-injury. These results identify an injury severity profile of BBB permeability, brain edema, and neurofunctional impairment that provides sensitive and clinically relevant outcome metrics for studying potential therapeutics.
Publisher
SAGE Publications,Mary Ann Liebert, Inc
Subject
/ Behavior, Animal - physiology
/ Blood-Brain Barrier - pathology
/ Blood-Brain Barrier - physiology
/ Brain
/ Cells
/ Extravasation of Diagnostic and Therapeutic Materials
/ Head Injuries, Penetrating - complications
/ Head Injuries, Penetrating - pathology
/ Head Injuries, Penetrating - surgery
/ Injuries
/ Intracranial Pressure - physiology
/ Male
/ Nervous System Diseases - etiology
/ Nervous System Diseases - pathology
/ Postural Balance - physiology
/ Rats
