title: [Effects of nicotinamide on action potentials of sinoatrial node cells and depolarized papillary muscle cells of the guinea pig].
mesh_terms: D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D005260:Female; D006168:Guinea Pigs; D007545:Isoproterenol / Q000494:pharmacology; D008297:Male; D008839:Microelectrodes; D009536:Niacinamide / Q000494:pharmacology*; D010210:Papillary Muscles / Q000166:cytology*; D012849:Sinoatrial Node / Q000166:cytology*; D014700:Verapamil / Q000494:pharmacology
chemical_list: D009536:Niacinamide; D014700:Verapamil; D007545:Isoproterenol