title: Letter: Serum levels in evaluating antidysrhythmic therapy.
mesh_terms: D000889:Anti-Arrhythmia Agents / Q000008:administration & dosage / Q000009:adverse effects / Q000097:blood*; D001145:Arrhythmias, Cardiac / Q000188:drug therapy*; D006801:Humans; D011342:Procainamide / Q000008:administration & dosage / Q000009:adverse effects / Q000097:blood*; D011802:Quinidine / Q000008:administration & dosage / Q000009:adverse effects / Q000097:blood*
chemical_list: D000889:Anti-Arrhythmia Agents; D011802:Quinidine; D011342:Procainamide