title: Effects of oximes, diacetylmonoxime, pyridine-2-aldoxime, and pyridine-2-aldoxime methochloride, on the electrical and mechanical activities of guinea pig cardiac ventricular muscles.
abstract: Effects of 3 oximes, diacetylmonoxime (DAM), pyridine-2-aldoxime (PAM) and pyridine-2-aldoxime methochloride (2-PAM), on the normal electrical and mechanical activities and on the slow response action potentials were examined in the guinea pig ventricular muscles. DAM and long-term exposure to high concentrations of PAM produced decreases in contractile force, action potential duration and slow response action potentials, whereas 2-PAM and low concentrations of PAM tended to increase these parameters. Thus, these 3 oximes did not act uniformly on cardiac muscle. It was speculated that DAM and high concentrations of PAM may act as slow channel inhibitors, whereas 2-PAM and low concentrations of PAM may act as slow channel activators.
mesh_terms: D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D002074:Butanones / Q000494:pharmacology*; D003931:Diacetyl / Q000031:analogs & derivatives / Q000494:pharmacology*; D004110:Diltiazem / Q000494:pharmacology; D006168:Guinea Pigs; D006321:Heart / Q000502:physiology*; D066298:In Vitro Techniques; D008297:Male; D009200:Myocardial Contraction / Q000187:drug effects*; D011220:Pralidoxime Compounds / Q000494:pharmacology*; D013997:Time Factors; D014700:Verapamil / Q000494:pharmacology
chemical_list: D002074:Butanones; D011220:Pralidoxime Compounds; C004717:diacetylmonoxime; D014700:Verapamil; D004110:Diltiazem; D003931:Diacetyl; C028797:pralidoxime