Delayed ischemic electrocortical suppression during rapid repeated cerebral ischemia and kainate-induced seizures in rat

The European Journal of Neuroscience
A IlieM Moldovan

Abstract

Global cerebral ischemia induces, within seconds, suppression of spontaneous electrocortical activity, partly due to alterations in synaptic transmission. In vitro studies have found that repeated brief hypoxic episodes prolong the persistence of synaptic transmission due to weakened adenosine release. The aim of this study was to investigate in vivo whether the time to ischemic electrocortical suppression (T(ES)) could be altered during energy stress conditions such as rapid repeated global cerebral ischemia and kainate-induced seizures. Experiments were carried out in adult rats under chloral hydrate anaesthesia. Repeated episodes of 1 min of ischemia were induced by transiently clamping the carotid arteries in a 'four-vessel occlusion' model. We devised an automatic method of T(ES) estimation based on the decay of the root mean square of two-channel electrocorticographic recordings. To distinguish the alterations in spontaneous electrocortical activity we compared T(ES) with the ischemic suppression of visual evoked potentials (VEP). During the first ischemic episode, T(ES) was approximately 15 s and remained unchanged when five ischemic episodes were separated by 10-min reperfusion intervals. When ischemia was repeated afte...Continue Reading

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Citations

Jan 6, 2009·Documenta Ophthalmologica. Advances in Ophthalmology·T JehleW A Lagrèze
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Sep 12, 2020·Brain Sciences·Elena Laura Georgescu MargarintLeon Zagrean

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