Postictal alteration of sodium content and apparent diffusion coefficient in epileptic rat brain induced by kainic acid.

Abstract:

PURPOSE:We studied temporal changes of brain sodium and apparent diffusion coefficient (ADC) in a temporal lobe epilepsy (TLE) rat model using kainic acid (KA). METHODS:In situ three-dimensional 23Na magnetic resonance imaging (MRI) and proton diffusion-weighted imaging (DWI) were used. KA at a dose of 10 mg/kg body weight and 12 adult Sprague Dawley rats weighing 228-318 g (268 +/- 25 g) were used. RESULTS:Twenty-four hours after KA injection, magnetic resonance (MR) visible sodium levels increased in both the pyriform cortex (+90%) and amygdala (+68%) and increased insignificantly in the hippocampus (+18%) and caudate-putamen (12%). The ADC in the pyriform cortex showed a -9% decrease at 5 h postictally, reaching -30% at 24 h, whereas in the amygdala decreases were -8 and -26% respectively. A significant decrease in ADC (-7%) in the hippocampus was also observed 24 h postically. Seven days later, sodium increases persisted, whereas ADC returned to normal level. CONCLUSIONS:The increase in MR visible sodium, associated with the decrease in ADC is consistent with the hypothesis that sequential seizures caused an increase in sodium influx and perturbation of membrane ion homeostasis, which eventually evolved into an irreversible phase of cellular edema, with increased MR visible intracellular sodium and decreased ADC. Return of ADC to near-control level and persistent high sodium level at 7 days may be explained by the increase in extracellular space and tissue necrosis.

journal_name

Epilepsia

journal_title

Epilepsia

authors

Wang Y,Majors A,Najm I,Xue M,Comair Y,Modic M,Ng TC

doi

10.1111/j.1528-1157.1996.tb00539.x

subject

Has Abstract

pub_date

1996-10-01 00:00:00

pages

1000-6

issue

10

eissn

0013-9580

issn

1528-1167

journal_volume

37

pub_type

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