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This study was designed to evaluate the prophylactic efficacy of a combinational patch system containing physostigmine and procyclidine against sarin and soman using guinea pig. The median lethal dose values of two nerve agents were calculated by a probit analysis of deaths occurring within 24 h. In this study, the values of median lethal dose of sarin and soman were determined to be 33.0 and 26.7 μg/kg in guinea-pigs, respectively. The guinea pigs treated with a prophylactic patch(4×5 cm) for 24 h were 100 % protected against a challenge of 1.5 LD50. The combinational KMARK-1(atropine and 2-PAM) and prophylactic patch were more effective than a single KMARK-1, a combination of pyridostigmine and KMARK-1 significantly. Epileptiform seizures in the guinea pigs treated with the combinational antidotes led to neuropathological changes, in comparison with intact feature of brain of the animal treated with the patch.

Antidotal and Neuroprotective Efficacies of a Prophylactic Patch against Sarin and Soman Poisonings in Guinea Pigs