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Coadministration of atropine, NBQX and TCP against soman-induced seizures
G Lallement1, I Pernot-Marino, A Foquin-Tarricone
1Unité de Neurotoxicologie, Centre de Recherches du Service de Sauté des Armées, La Tronche, France.
Abstract:
The ability of relatively low doses of atropine, NBQX and TCP administered in combination to prevent or stop seizures induced by soman, was studied in rats. While these drugs injected together early after soman prevented the onset of seizures, their delayed concomitant administration after 5 or 30 min of epileptic activity only mildly attenuated the intensity of seizures. Conversely, a total arrest of epileptic activity was observed in 80 to 100% of animals when NBQX and TCP were given together after 5 to 50 min of seizures to atropine pretreated rats. The large time-window for antiepileptic effectiveness of this 'three drug treatment', provided that atropine is administered early after soman, is discussed in relation to reciprocal potentiations of the antiepileptic effects of atropine, NBQX and TCP in combination.
Insights
A combination of atropine, NBQX, and TCP effectively prevented soman-induced seizures in rats when given early. Delayed administration showed limited effect, but NBQX and TCP arrested seizures in atropine-pretreated rats, indicating a broad therapeutic window.
Area of Science:
- Neuroscience
- Pharmacology
- Toxicology
Background:
- Organophosphorus nerve agents like soman cause severe seizures.
- Existing treatments have limitations in efficacy and timing.
- Atropine, NBQX, and TCP are potential anticonvulsant agents.
Purpose of the Study:
- To evaluate the anticonvulsant efficacy of combined atropine, NBQX, and TCP against soman-induced seizures in rats.
- To determine the optimal timing and combination of these drugs for seizure prevention and cessation.
- To investigate the synergistic effects of these drugs in a rodent model.
Main Methods:
- Rats were exposed to soman and treated with varying combinations and timings of atropine, NBQX, and TCP.
- Seizure activity was monitored and quantified.
- The onset, intensity, and duration of epileptic activity were assessed.
Main Results:
- Early combined administration of atropine, NBQX, and TCP prevented soman-induced seizures.
- Delayed administration (5-30 min post-soman) showed only mild attenuation of seizure intensity.
- Concomitant administration of NBQX and TCP in atropine-pretreated rats arrested seizures in 80-100% of animals, even after 5-50 min of seizure activity.
Conclusions:
- A combination therapy of atropine, NBQX, and TCP demonstrates significant anticonvulsant effects against soman-induced seizures.
- Early atropine administration is crucial for establishing a broad therapeutic window for the combined treatment.
- Reciprocal potentiation of antiepileptic effects underlies the efficacy of this multi-drug approach.