Which of the following individuals is most likely to be experiencing vasodilation?
A)
A 51-year-old man with a history of hypertension who is taking a medication that blocks the effect of the renin-angiotensin-aldosterone system
B)
A 9-year-old boy who has been given an injection of epinephrine to preclude an anaphylactic reaction to a bee sting
C)
A 30-year-old woman who takes antihistamines to treat her seasonal allergies
D)
A 32-year-old man who takes a selective serotonin reuptake inhibitor for the treatment of depression
Ans:
A
Feedback:
Angiotensin is a potent vasoconstrictor, and medications that block this induce vasodilation. Epinephrine is also a vasoconstrictor. Histamine is a vasodilator, so antihistamine medications are likely to induce vasoconstriction. Serotonin is a vasoconstrictor, so medications that block its reuptake and increase free levels are apt to promote vasoconstriction.
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