title: Letter: Serum potassium levels and myocardial threshold of excitability.
mesh_terms: D000818:Animals; D004285:Dogs; D006321:Heart / Q000503:physiopathology*; D006801:Humans; D010138:Pacemaker, Artificial; D011188:Potassium / Q000097:blood*
chemical_list: D011188:Potassium