Propranolol-insensitive effects of epinephrine on action potential repolarization in electrically driven atria of the guinea pig.

Action Potentials/drug effects Animals Atrial Function Electric Stimulation Epinephrine/antagonists & inhibitors,pharmacology Ergotamine/pharmacology Guinea Pigs Heart/drug effects Heart Atria/drug effects In Vitro Techniques Isoproterenol/pharmacology Membrane Potentials/drug effects Muscles/drug effects Norepinephrine/pharmacology Phentolamine/pharmacology Propranolol/pharmacology Receptors, Adrenergic/drug effects

Receptors, Adrenergic Propranolol Isoproterenol Ergotamine Norepinephrine Epinephrine Phentolamine