title: Cardiac pacing as a subspecialty.
mesh_terms: D002304:Cardiac Pacing, Artificial; D002309:Cardiology / Q000639:trends*; D006801:Humans; D008511:Medicine / Q000639:trends*; D010138:Pacemaker, Artificial; D012955:Societies, Medical; D013038:Specialization; D014481:United States