title: America's $39 billion heart business.
mesh_terms: D000889:Anti-Arrhythmia Agents / Q000627:therapeutic use; D006348:Cardiac Surgical Procedures / Q000191:economics*; D004345:Drug Industry / Q000191:economics; D006331:Heart Diseases / Q000188:drug therapy / Q000191:economics* / Q000453:epidemiology; D006801:Humans; D013677:Medical Laboratory Science / Q000639:trends*; D014481:United States