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Cited by 1,229

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A new model of diffuse brain injury in rats: Part I: Pathophysiology and biomechanics

Marmarou, Anthony, Foda, Montasser A. Abd-Elfattah, Brink, Wimer van den, Campbell, J., Kita, H., Demetriadou, K.·1994·Journal of Neurosurgery

Abstract

✓ This report describes the development of an experimental head injury model capable of producing diffuse brain injury in the rodent. A total of 161 anesthetized adult rats were injured utilizing a simple weight-drop device consisting of a segmented brass weight free-falling through a Plexiglas guide tube. Skull fracture was prevented by cementing a small stainless-steel disc on the calvaria. Two groups of rats were tested: Group 1, consisting of 54 rats, to establish fracture threshold; and Group 2, consisting of 107 animals, to determine the primary cause of death at severe injury levels. Data from Group 1 animals showed that a 450-gm weight falling from a 2-m height (0.9 kg-m) resulted in a mortality rate of 44% with a low incidence (12.5%) of skull fracture. Impact was followed by apnea, convulsions, and moderate hypertension. The surviving rats developed decortication flexion deformity of the forelimbs, with behavioral depression and loss of muscle tone. Data from Group 2 animals suggested that the cause of death was due to central respiratory depression; the mortality rate decreased markedly in animals mechanically ventilated during the impact. Analysis of mathematical models showed that this mass-height combination resulted in a brain acceleration of 900 G and a brain compression gradient of 0.28 mm. It is concluded that this simple model is capable of producing a graded brain injury in the rodent without a massive hypertensive surge or excessive brain-stem damage.

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Crossref · 10.3171/jns.1994.80.2.0291

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Authors
Marmarou, A., Foda, M. A. A.-E., Brink, W. V. D., Campbell, J., Kita, H., & Demetriadou, K.
Venue
Journal of Neurosurgery
Published
1994-02
Volume
80
Issue
2
Pages
291-300
ISSN
0022-3085 (ISSN-L)
OpenAlex
W2103044571
Cited by
1,229
References
0
FWCI
13.45
Type
journal article
Language
en
Open access
closed

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