title: A fifth class of antiarrhythmic action?
mesh_terms: D000889:Anti-Arrhythmia Agents / Q000145:classification*; D002118:Calcium / Q000037:antagonists & inhibitors; D003000:Clonidine / Q000031:analogs & derivatives* / Q000494:pharmacology; D006801:Humans; D012849:Sinoatrial Node / Q000187:drug effects
chemical_list: D000889:Anti-Arrhythmia Agents; C022192:alinidine; D003000:Clonidine; D002118:Calcium