[Effect of arpenal on the EMG-potentials of the anterior tibial muscle in cats during acute phosdrine poisoning].

The authors examined the changes in the nerve-muscular conductivit occuring after acute poisoning with phosdrine and treatment with arpenal and oximic reacytivators of HE-toxogonine and TMB-4 on 20 cats, anesthethised with urethane and atropine protection under the conditions of artificinal respiration. They found that there was a total nerve-muscular block cessation of the mediation in the myoneural synaptic zones, characterized by complete cessation also of the induced electrical responses after single and serial stimuli, during acute intoxications with phosdrine, used in lethal doses of 300 mg/kg intramuscularly. After treatment with H-cholinolitics (arpenal) there was a quick recovery of the muscle contractions as well as of the evoked myopotentials after stimulation with single electric stimuli. In contrast to the oximnic reactivators of He (toxogonine, TMB-4) during serial electric stimuli (10,20 and 30 per second after treatment with arpenal there was a quick contraction only after the first stimulus, after which a progresive weakening of the induced electric myopotentials followed till the appearence of a total nerve-muscular block. This phenomenon was explained by the lack of reactivating properties of H-cholinolitics to HE, inhibited by FOV.