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Abstract
Ontogenetic differences in seizure thresholds to pentylenetetrazol (PTZ) were examined in young, developing rats (ages: 10, 18, 28, and 60 days). A subconvulsive dose of PTZ (15 mg/kg IP) was administered every 10 min and the occurrence of partial and full (clonic tonic) seizures was noted. Ten day old pups displayed complete seizures more rapidly than any of the other groups ( p < .01) without any behavioral indication of going through the partial stages. Among 18 day old pups the development of early seizure stages was followed rapidly by the full seizure, while in the weaned groups the early seizure stages tended to persist much longer before the appearance of the full generalized convulsion. The preweanling rat's immature brain seems less able to suppress PTZ induced generalized convulsions compared to the brain of the older rats.
Published Version
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