Diazepam prophylaxis for lignocaine induced convulsions.

Area of Science:

• Pharmacology
• Neuroscience
• Toxicology

Background:

• Lignocaine (lidocaine) hydrochloride can induce seizures and mortality at high doses.
• Barbiturates like phenobarbitone and pentobarbitone are commonly used CNS depressants but their efficacy against lignocaine-induced seizures is questionable.
• Diazepam, a benzodiazepine, is known for its anxiolytic and anticonvulsant properties.

Purpose of the Study:

• To evaluate the efficacy of phenobarbitone, pentobarbitone, and diazepam in preventing lignocaine-induced seizures in a rat model.
• To compare the protective effects of these agents against the neurotoxic effects of lignocaine.
• To determine the optimal dose of diazepam for seizure prevention without significant adverse effects.

Main Methods:

• Adult rats were pretreated with intraperitoneal injections of phenobarbitone (4 mg/kg), pentobarbitone (6 mg/kg), or diazepam (2.5, 5, and 7.5 mg/kg).
• Following pretreatment, rats received an intraperitoneal injection of lignocaine hydrochloride (100 mg/kg).
• The incidence of seizures, mortality, and general behavioral effects (wakefulness, gait) were monitored and recorded.

Main Results:

• Phenobarbitone and pentobarbitone showed minimal protection against lignocaine-induced seizures and mortality, despite causing significant sedation.
• Diazepam, even at lower doses (2.5 and 5 mg/kg) with minimal sedation, completely prevented convulsions.
• The highest dose of diazepam (7.5 mg/kg) completely prevented both seizures and mortality, although it caused more pronounced effects on wakefulness and gait.

Conclusions:

• Diazepam is highly effective in preventing lignocaine-induced seizures and mortality in rats.
• Diazepam demonstrates superior anticonvulsant activity compared to phenobarbitone and pentobarbitone in this model.
• Pretreatment with diazepam is a viable strategy to mitigate the neurotoxic effects of lignocaine overdose.