title: Letter: Digitalis and nonconducted atrial premature contractions.
mesh_terms: D005117:Cardiac Complexes, Premature / Q000139:chemically induced*; D004077:Digoxin / Q000009:adverse effects* / Q000097:blood; D004562:Electrocardiography; D006321:Heart / Q000187:drug effects*; D006801:Humans; D011188:Potassium / Q000097:blood
chemical_list: D004077:Digoxin; D011188:Potassium