Developmental patterns of postictal refractoriness and potentiation akin to cortical stimulation.

Abstract:

:Postictal refractoriness checked by paired stimulations of the limbic structures was demonstrated to fail in rats<2 weeks old. Cortical epileptic afterdischarges were used in our study to examine if this phenomenon is restricted to old cortical structures or if it is a general one. Rats 12, 15, 18, 25, and 90 days old with implanted electrodes formed the experimental groups. Stimulation was performed by 15-s series of 1-msec pulses with suprathreshold intensity and frequency of 8 Hz. Paired stimulation of the cerebral cortex in 12-day-old rats elicited the second afterdischarge, even if the 30-s interval was used. Refractoriness started to appear in the third postnatal week and developed progressively so that 25-day-old rats did not differ from adult animals, that is, an interval longer than 1 min was necessary for elicitation of the second seizure.

journal_name

Epilepsia

journal_title

Epilepsia

authors

Mareš P,Kubová H

doi

10.1111/epi.12870

subject

Has Abstract

pub_date

2015-01-01 00:00:00

pages

e10-4

issue

1

eissn

0013-9580

issn

1528-1167

journal_volume

56

pub_type

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