Deck 8: Adrenoceptor Agonists

Question 1

Phenylephrine is contained in many nasal decongestant products.Which action contributes to its therapeutic effect?

A) activation of adenylyl cyclase
B) inhibition of phosphodiesterase
C) activation of phospholipase C
D) activation of nitric oxide synthase
E) inhibition of adenosine deaminase

Answer 1

activation of phospholipase C

Question 2

A patient in the intensive care unit is given dexmedetomidine.Which therapeutic outcome may result from this medication?

A) vasoconstriction and increased blood pressure
B) analgesia and sedation
C) increased cardiac output
D) muscle relaxation
E) bronchodilation

Answer 2

analgesia and sedation

Question 3

A patient with heart failure is given an intravenous dobutamine infusion to reduce impedance to left ventricular ejection.Which receptors mediate this effect of dobutamine?

A) dopamine D₁ receptors
B)α₁-adrenoceptors
C) α₂-adrenoceptors
D) β₁-adrenoceptors
E) β₂-adrenoceptors

Answer 3

β₂-adrenoceptors