Temporary Blood Brain Barrier Damage and Continued Edema Formation in Experimental Closed Head Injury in the Rat
The disruption of the blood brain barrier (BBB) and development of brain edema concomitant with traumatic brain injury has been well established [5,7]. In experimental studies, at least two factors contribute to this disruption immediately upon impact; the mechanical deformation of tissue and cerebral vessels and the hypertensive surge that accompanies the injury. This hypertensive surge is seen with experimental fluid percussion injury . In fact, hypertension alone is sufficient to cause BBB disruption and models of pharmacologic induced hypertension mimicking the surge observed with experimental models have produced similar defects in the barrier . The objective of this study was to determine if a similar hypertensive surge and BBB disruption occurred with impact-acceleration to the closed calvarium as has been observed with direct dural impact. This would help clarify the role that hypertension plays in the degree of barrier disruption in mechanical trauma under conditions more allied to the clinical experience.
KeywordsBlood Brain Barrier Edema Formation Blood Brain Barrier Disruption Brain Water Content Fluid Percussion Injury
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