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Neuronal activity and cortical perfusion determined by quantitative EEG analysis and laser doppler flowmetry are uncoupled in brain injured rats


Stover, J F; Sakowitz, O W; Unterberg, A W (2004). Neuronal activity and cortical perfusion determined by quantitative EEG analysis and laser doppler flowmetry are uncoupled in brain injured rats. In: Baethmann, A; et al. Mechanisms of secondary brain damage from trauma and ischemia : recent advances of our understanding. Wien: Springer, 81-85.

Abstract

Following traumatic brain injury uncoupling of metabolism from perfusion, reflected by an increase in cellular activity in face of reduced perfusion contributes to secondary tissue damage. Standard autoradiographic techniques employed to study metabolism and perfusion are limited by the inability to perform longitudinal investigations. Therefore, the aims of this study were to investigate if metabolic uncoupling can be studied by applying noninvasive and non-radioactive methods. For this, quantitative EEG analysis and laser Doppler flowmetry were employed to determine changes in EEG activity as a global measure of neuronal activity and pericontusional cortical perfusion during the early phase following controlled cortical impact injury (CCII). In eight rats changes in neuronal activity and pericontusional cortical perfusion were determined before, at 4 and 24 hours after CCII. Neuronal activity was significantly increased by 40% at 4 hours after CCII followed by a significant decrease by 60% at 24 hours compared to pre-trauma levels. Pericontusional cortical perfusion was significantly reduced by 45% and 18% at 4 and 24 hours after CCII. respectively. Non-radioactive methods like quantitative EEG analysis and laser Doppler flowmetry can be used to reveal underlying uncoupling of EEG activity from cortical perfusion which is mostly sustained in the early phase following CCII.

Following traumatic brain injury uncoupling of metabolism from perfusion, reflected by an increase in cellular activity in face of reduced perfusion contributes to secondary tissue damage. Standard autoradiographic techniques employed to study metabolism and perfusion are limited by the inability to perform longitudinal investigations. Therefore, the aims of this study were to investigate if metabolic uncoupling can be studied by applying noninvasive and non-radioactive methods. For this, quantitative EEG analysis and laser Doppler flowmetry were employed to determine changes in EEG activity as a global measure of neuronal activity and pericontusional cortical perfusion during the early phase following controlled cortical impact injury (CCII). In eight rats changes in neuronal activity and pericontusional cortical perfusion were determined before, at 4 and 24 hours after CCII. Neuronal activity was significantly increased by 40% at 4 hours after CCII followed by a significant decrease by 60% at 24 hours compared to pre-trauma levels. Pericontusional cortical perfusion was significantly reduced by 45% and 18% at 4 and 24 hours after CCII. respectively. Non-radioactive methods like quantitative EEG analysis and laser Doppler flowmetry can be used to reveal underlying uncoupling of EEG activity from cortical perfusion which is mostly sustained in the early phase following CCII.

Additional indexing

Item Type:Book Section, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Division of Surgical Intensive Care Medicine
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:1 June 2004
Deposited On:25 Sep 2009 12:47
Last Modified:05 Apr 2016 12:51
Publisher:Springer
Series Name:Acta Neurochirurgica Supplementum
Number:89
ISSN:0065-1419
ISBN:3-211-20932-8
PubMed ID:15335105

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