title: Sodium dependence of the inotropic effect of a reduction in extracellular potassium concentration.
mesh_terms: D000200:Action Potentials; D000818:Animals; D006168:Guinea Pigs; D006321:Heart / Q000502:physiology*; D066298:In Vitro Techniques; D008564:Membrane Potentials; D009119:Muscle Contraction; D009206:Myocardium; D009994:Osmolar Concentration; D010210:Papillary Muscles; D011188:Potassium / Q000502:physiology*; D012964:Sodium / Q000502:physiology*
chemical_list: D012964:Sodium; D011188:Potassium