A 40-year-old man has two episodes of chest tightness over the past 3 months. An angiogram is performed showing coronary blood flow following an infusion of norepinephrine (NE). Which of the following mediators primarily accounts for the increased coronary blood flow observed 1 to 2 minutes following the NE infusion?
Adenosine
Angiotensin II
Epinephrine
Histamine
Natriuretic peptide
