A fourth class of anti-dysrhythmic action? Effect of verapamil on ouabain toxicity, on atrial and ventricular intracellular potentials, and on other features of cardiac function.

Action Potentials/drug effects Anesthesia, Local Animals Anti-Arrhythmia Agents/classification Anura Arrhythmias, Cardiac/prevention & control Calcium/metabolism Electric Conductivity/drug effects Electrocardiography Guinea Pigs Heart/drug effects Heart Atria/drug effects Heart Ventricles/drug effects In Vitro Techniques Membrane Potentials/drug effects Muscle Contraction/drug effects Myocardium/metabolism Ouabain/antagonists & inhibitors Rabbits Sciatic Nerve/drug effects Verapamil/pharmacology

Anti-Arrhythmia Agents Ouabain Verapamil Calcium