Cardio Pharm Question

Mr Green, a 54-year-old banker, had a cardiac transplant 6 months ago. His current blood pressure is 120/70 mm Hg and heart rate is 100 bpm. Which of the following drugs would have the least effect on Mr Green's heart rate? (A)Albuterol (B)Epinephrine (C)Isoproterenol (D)Norepinephrine (E)Phenylephrine Answer : E Could someone please explain why E is correct? Thank you Wouldn't you get reflex bradycardia w/ Phenylephrine?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums