title: Pacemaker technology: energy sources.
mesh_terms: D002304:Cardiac Pacing, Artificial / Q000639:trends; D011211:Electric Power Supplies / Q000639:trends; D006207:Half-Life; D006801:Humans; D008094:Lithium; D008628:Mercury; D009678:Nuclear Energy; D010138:Pacemaker, Artificial / Q000639:trends
chemical_list: D008094:Lithium; D008628:Mercury