MEDSCI303 Pharmacy Exam 2 Version 2 Questions
with Correct Answers and Expert Explanation for
Each Question
1. A patient with a history of asthma requires a beta-blocker for hypertension. Which
of the following medications is the most appropriate choice to minimize respiratory
risks?
A. Propranolol
B. Metoprolol
C. Nadolol
D. Timolol
Correct Answer: B
Expert Explanation: Metoprolol is a cardioselective beta-1 antagonist that
primarily targets receptors in the heart. Unlike non-selective agents like
propranolol, it has a lower affinity for beta-2 receptors found in the bronchioles.
This selectivity reduces the likelihood of triggering bronchospasms in patients with
reactive airway diseases. However, selectivity is dose-dependent and can be lost at
higher concentrations. Clinical reasoning necessitates close monitoring of
respiratory status even when using selective agents.
,2. Which clinical manifestation should a nurse anticipate in a patient who has received
an overdose of a muscarinic antagonist like Atropine?
A. Excessive salivation
B. Urinary retention
C. Increased bowel sounds
D. Pupillary constriction
Correct Answer: B
Expert Explanation: Atropine blocks muscarinic receptors, which leads to a
decrease in parasympathetic activity across various organ systems. This blockade
inhibits the contraction of the detrusor muscle and the relaxation of the urinary
sphincter. Consequently, the patient is unable to void, leading to acute urinary
retention. Other common signs include dry mouth, blurred vision, and tachycardia
due to the lack of cholinergic tone. Managing this condition often involves bladder
scanning and potential catheterization to relieve discomfort.
3. Bethanechol is frequently prescribed for postoperative patients. What is the
primary therapeutic goal of this medication in this setting?
A. To reduce heart rate
B. To treat non-obstructive urinary retention
C. To promote pupil dilation
,D. To manage hypertension
Correct Answer: B
Expert Explanation: Bethanechol is a direct-acting cholinergic agonist that
specifically stimulates muscarinic receptors in the urinary tract. It increases the
tone of the detrusor muscle, which facilitates the emptying of the bladder. This is
particularly useful after surgery when anesthesia may have suppressed normal
bladder function. It should not be used if a physical obstruction like a kidney stone
or tumor is present. Nurses must assess the patient’s output to ensure the drug is
achieving its intended therapeutic effect.
4. A patient is diagnosed with Myasthenia Gravis. Which medication would be most
effective in improving muscle strength by inhibiting acetylcholinesterase?
A. Atropine
B. Pancuronium
C. Neostigmine
D. Epinephrine
Correct Answer: C
Expert Explanation: Neostigmine works by inhibiting the enzyme
acetylcholinesterase, which is responsible for breaking down acetylcholine in the
synaptic cleft. By preventing this breakdown, more acetylcholine is available to
, stimulate nicotinic receptors at the neuromuscular junction. This increased
stimulation helps overcome the autoantibody-mediated reduction of receptors
characteristic of Myasthenia Gravis. Improved muscle contraction and reduced
fatigue are the primary clinical goals for these patients. Proper dosing is critical to
avoid a cholinergic crisis, which presents as severe muscle weakness.
5. During the administration of Epinephrine in an anaphylactic reaction, which
physiological effect is mediated by the stimulation of Alpha-1 receptors?
A. Vasoconstriction
B. Increased heart rate
C. Bronchodilation
D. Decreased blood pressure
Correct Answer: A
Expert Explanation: Epinephrine is a non-selective adrenergic agonist that acts on
alpha and beta receptors to stabilize the patient. Alpha-1 receptor stimulation
causes significant vasoconstriction of the peripheral blood vessels. This action is
vital in anaphylaxis because it increases blood pressure and reduces mucosal
edema. While beta-2 stimulation provides bronchodilation, the alpha-1 effect
addresses the circulatory collapse often seen in shock. Monitoring for hypertension
and distal ischemia is a necessary component of post-administration care.
with Correct Answers and Expert Explanation for
Each Question
1. A patient with a history of asthma requires a beta-blocker for hypertension. Which
of the following medications is the most appropriate choice to minimize respiratory
risks?
A. Propranolol
B. Metoprolol
C. Nadolol
D. Timolol
Correct Answer: B
Expert Explanation: Metoprolol is a cardioselective beta-1 antagonist that
primarily targets receptors in the heart. Unlike non-selective agents like
propranolol, it has a lower affinity for beta-2 receptors found in the bronchioles.
This selectivity reduces the likelihood of triggering bronchospasms in patients with
reactive airway diseases. However, selectivity is dose-dependent and can be lost at
higher concentrations. Clinical reasoning necessitates close monitoring of
respiratory status even when using selective agents.
,2. Which clinical manifestation should a nurse anticipate in a patient who has received
an overdose of a muscarinic antagonist like Atropine?
A. Excessive salivation
B. Urinary retention
C. Increased bowel sounds
D. Pupillary constriction
Correct Answer: B
Expert Explanation: Atropine blocks muscarinic receptors, which leads to a
decrease in parasympathetic activity across various organ systems. This blockade
inhibits the contraction of the detrusor muscle and the relaxation of the urinary
sphincter. Consequently, the patient is unable to void, leading to acute urinary
retention. Other common signs include dry mouth, blurred vision, and tachycardia
due to the lack of cholinergic tone. Managing this condition often involves bladder
scanning and potential catheterization to relieve discomfort.
3. Bethanechol is frequently prescribed for postoperative patients. What is the
primary therapeutic goal of this medication in this setting?
A. To reduce heart rate
B. To treat non-obstructive urinary retention
C. To promote pupil dilation
,D. To manage hypertension
Correct Answer: B
Expert Explanation: Bethanechol is a direct-acting cholinergic agonist that
specifically stimulates muscarinic receptors in the urinary tract. It increases the
tone of the detrusor muscle, which facilitates the emptying of the bladder. This is
particularly useful after surgery when anesthesia may have suppressed normal
bladder function. It should not be used if a physical obstruction like a kidney stone
or tumor is present. Nurses must assess the patient’s output to ensure the drug is
achieving its intended therapeutic effect.
4. A patient is diagnosed with Myasthenia Gravis. Which medication would be most
effective in improving muscle strength by inhibiting acetylcholinesterase?
A. Atropine
B. Pancuronium
C. Neostigmine
D. Epinephrine
Correct Answer: C
Expert Explanation: Neostigmine works by inhibiting the enzyme
acetylcholinesterase, which is responsible for breaking down acetylcholine in the
synaptic cleft. By preventing this breakdown, more acetylcholine is available to
, stimulate nicotinic receptors at the neuromuscular junction. This increased
stimulation helps overcome the autoantibody-mediated reduction of receptors
characteristic of Myasthenia Gravis. Improved muscle contraction and reduced
fatigue are the primary clinical goals for these patients. Proper dosing is critical to
avoid a cholinergic crisis, which presents as severe muscle weakness.
5. During the administration of Epinephrine in an anaphylactic reaction, which
physiological effect is mediated by the stimulation of Alpha-1 receptors?
A. Vasoconstriction
B. Increased heart rate
C. Bronchodilation
D. Decreased blood pressure
Correct Answer: A
Expert Explanation: Epinephrine is a non-selective adrenergic agonist that acts on
alpha and beta receptors to stabilize the patient. Alpha-1 receptor stimulation
causes significant vasoconstriction of the peripheral blood vessels. This action is
vital in anaphylaxis because it increases blood pressure and reduces mucosal
edema. While beta-2 stimulation provides bronchodilation, the alpha-1 effect
addresses the circulatory collapse often seen in shock. Monitoring for hypertension
and distal ischemia is a necessary component of post-administration care.
