PMID: 8973383Sep 1, 1996Paper

Effects of antiarrhythmic agents and Mg2+ on aconitine-induced arrhythmias

Japanese Heart Journal
T SawanoboriM Hiraoka

Abstract

The effects of antiarrhythmic agents, including Classes I and IV and 3-10 mM Mg2+ on aconitine-induced arrhythmias were examined using a conventional microelectrode and patch clamp method in Langendorff-perfused rabbit hearts and isolated guinea-pig ventricular myocytes. Intracoronary application of 0.1 microM aconitine induced polymorphic ventricular tachycardia (PVT) which continued for more than 60 minutes. Application of aconitine to ventricular myocytes caused a prolonged action potential duration (APD) and the appearance of early afterdepolarization (EAD) together with the occurrence of an inward hump of the I-V curve around -60 to -40 mV and increased outward current at positive voltages. Application of 10 microM TTX and 5 mM or higher Mg2+ restored aconitine-induced PVT to sinus rhythm in Langendorff-perfused preparations and also shortened the prolonged APD, demonstrating the abolishment of EAD by aconitine in ventricular myocytes. However, antiarrhythmic agents did not exert such effects. In conclusion, the antiarrhythmic actions of Mg2+ and TTX in aconitine-induced arrhythmia are to abolish EAD and shorten the prolonged APD by suppression of the inward Na+ current around -60 to -40 mV.

Citations

Apr 3, 2010·Journal of Medical Toxicology : Official Journal of the American College of Medical Toxicology·Alex F ManiniRobert S Hoffman
May 12, 2005·Journal of Ethnopharmacology·Shorong-Shii LiouJuei-Tang Cheng
Sep 12, 2012·Cardiovascular Psychiatry and Neurology·Erica B RoysterDominique L Musselman
Jan 1, 2003·Journal of Toxicology. Clinical Toxicology·Lewis S Nelson
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Sep 16, 2009·The American Journal of Emergency Medicine·Philippe GottigniesDavid De Bels
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Mar 31, 2015·Der Anaesthesist·A ClaraG Drüge
Sep 9, 2006·Journal of Pharmacological Sciences·Nobuo HommaKeitaro Hashimoto
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