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Hyperglycemia does not augment neuronal damage in experimental status epilepticus.

J H Swan, B S Meldrum, R P Simon

    Neurology
    |October 1, 1986
    PubMed
    Summary

    High blood glucose during seizures did not worsen brain damage in rats. Only the duration of the seizure (status epilepticus) predicted neuropathologic damage, not elevated glucose or lactate levels.

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    Area of Science:

    • Neuroscience
    • Neurology
    • Biochemistry

    Background:

    • Neuronal damage from ischemia and status epilepticus share similarities.
    • Elevated plasma glucose and increased brain lactate correlate with severe neuropathologic damage in cerebral ischemia.

    Purpose of the Study:

    • To investigate the impact of varying plasma glucose concentrations on neuronal damage during L-allylglycine-induced status epilepticus.
    • To examine the relationship between brain lactate and glucose levels and neuropathologic outcomes in rat hippocampus.

    Main Methods:

    • Rats were subjected to 2 hours of L-allylglycine-induced status epilepticus.
    • Plasma glucose concentrations were maintained at 65, 250, or 480 mg/100 ml.
    • Cerebral glucose and lactate content, cytologic features, and neuropathologic damage were assessed.

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    Main Results:

    • Brain lactate levels increased during status epilepticus, peaking in the high-glucose group.
    • Maximum brain lactate levels (8 mumol/g) were below the threshold associated with cell death in ischemia.
    • Only the duration of status epilepticus, not glucose or lactate levels, predicted neuropathologic damage.

    Conclusions:

    • Hyperglycemia does not exacerbate neuronal damage in this model of status epilepticus.
    • Seizure duration is the critical factor influencing neuropathologic outcomes, independent of glucose and lactate levels.