Pharmacology Question-5

5. The location of the lesion in Horner syndrome
(either preganglionic or postganglionic) can be
determined by the use of certain sympathomimetics.
Which of the following agents
would distinguish between a preganglionic
versus a postganglionic lesion?
(A) amphetamine
(B) atenolol
(C) epinephrine
(D) isoproterenol
(E) phenylephrine

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