coronary arterial spasm can be induced by exercise , cold pressor test , hyperventilation , valsalva maneuver , and the administration of pharmacological agents such as sympathomimetic agents ( epinephrine , norepinephrine , etc . ) , beta-blocking agents ( propranolol , etc . ) , parasympathomimetic agents ( methacholine , pilocarpine , etc . ) , ergot alkaloids ( ergonovine , ergotamine , etc . ) , alcohol , and others , particularly in the morning when spontaneous coronary arterial spasm is most likely to occur .
C0014563
epinephrine
C0028351
norepinephrine