Treatment OutcomeTetrodotoxinSaxitoxinSodium Channel BlockersTime FactorsSodium ChannelsVeratridineAction PotentialsSodiumMembrane PotentialsElectric StimulationAtropineFollow-Up StudiesGuinea PigsTetraodontiformesMuscle ContractionDose-Response Relationship, DrugMuscle, SmoothNeuronsElectrophysiologyPotassiumFishes, PoisonousProtoveratrinesCalciumVeratrineLong-Term Care