Neural dynamics during anoxia and the "wave of death".

Neural dynamics during anoxia and the "wave of death".

Blog Article

Recent experiments in Ski de fond - Homme - Bottes - Classic rats have shown the occurrence of a high amplitude slow brain wave in the EEG approximately 1 minute after decapitation, with a duration of 5-15 s (van Rijn et al, PLoS One 6, e16514, 2011) that was presumed to signify the death of brain neurons.We present a computational model of a single neuron and its intra- and extracellular ion concentrations, which shows the physiological mechanism for this observation.The wave is caused by Scopes membrane potential oscillations, that occur after the cessation of activity of the sodium-potassium pumps has lead to an excess of extracellular potassium.These oscillations can be described by the Hodgkin-Huxley equations for the sodium and potassium channels, and result in a sudden change in mean membrane voltage.In combination with a high-pass filter, this sudden depolarization leads to a wave in the EEG.

We discuss that this process is not necessarily irreversible.