perfusions of 0.9 % nacl , one to ten micrograms of acetylcholine , isoproterenol , epinephrine and norepinephrine , into the anterior septal artery caused variations in the ecg ranging from exaggerated st-t changes to pr prolongation , ectopic atrial , nodal and ventricular beats , a-v blocks and dissociations , atrial fibrillation and ventricular fibrillation .
C0022245
isoproterenol
C0042510
ventricular fibrillation