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Seizure susceptibility & intra rectal sodium valproate induced recovery in developing undernourished rats
S K Sharma1, M Behari, M C Maheshwari
1Department of Neurology, All India Institute of Medical Sciences, New Delhi.
Insights
Undernourished rats are more susceptible to seizures. Intrarectal sodium valproate showed limited therapeutic potential in undernourished rats, with delayed neuronal recovery and reduced electrophysiological responses.
Area of Science:
- Neuroscience
- Pharmacology
- Nutritional Science
Background:
- Undernutrition significantly impacts neurological function and seizure susceptibility.
- Developing brains are particularly vulnerable to nutritional deficits, affecting seizure thresholds.
- The penicillin-induced seizure model is a standard method for studying epilepsy.
Purpose of the Study:
- To investigate the seizure threshold and therapeutic efficacy of intrarectal sodium valproate in young, developing normal and undernourished rats.
- To compare the electrophysiological responses to sodium valproate between normal and undernourished rat models.
- To assess the impact of nutritional status on neuronal recovery and seizure activity.
Main Methods:
- Utilized the penicillin-induced seizure model in young rats.
- Administered intrarectal sodium valproate (25 mg/kg) to assess therapeutic effects.
- Monitored electrophysiological parameters including electrocortical activity, spike frequency and amplitude, and neuronal recovery time.
- Compared responses between normal, undernourished, and rehabilitated rat groups.
Main Results:
- Undernourished rats exhibited heightened susceptibility to seizures, characterized by generalized electrocortical inhibition and recurrent epileptic discharges.
- Intrarectal sodium valproate treatment in undernourished rats led to delayed neuronal recovery, reduced spike frequency and amplitude (P < 0.001), and diminished electrocortical activity.
- Rehabilitated rats showed partial neuronal recovery correlated with improved body weight.
- Significant electrophysiological differences between normal and undernourished rats emerged at higher penicillin doses (20-30 IU).
Conclusions:
- Undernutrition significantly lowers the seizure threshold and impairs the therapeutic response to sodium valproate.
- Delayed neuronal recovery and altered electrophysiological parameters in undernourished rats highlight the detrimental effects of malnutrition on brain function.
- Nutritional rehabilitation may partially restore neuronal function, but deficits persist compared to normal controls.
Abstract:
The seizure threshold and therapeutic potential of intrarectal sodium valproate were studied in young developing normal and undernourished rats, using the penicillin model. Undernourished rats were highly susceptible to seizure discharge. They exhibited generalised electrocortical inhibition and repeated episodes of epileptic discharges even after temporary neuronal recovery. Delayed spontaneous and drug induced neuronal recovery, low spike frequency and amplitude (P less than 0.001) reduced background EEG and marked electrocortical silence in response to intrarectal (25 mg/kg) sodium valproate treatment, was observed in the undernourished animals. Rehabilitated animals exhibited partial neuronal recovery which was related to the improvement in body weight. Analysis of spike frequency, spike amplitude and neuronal recovery time showed that both normal and undernourished animals behaved in a similar fashion at lower doses of penicillin (2.5 to 15 IU). Significant differences in the electrophysiological parameters were observed between the two groups at higher doses of penicillin (20 to 30 IU).