INTENSIVE REVIEW OF DRUG CLASSES, ACTIONS, AND
NURSING IMPLICATIONS
Question 1
A 68-year-old male patient with a long-standing history of hypertension and congestive heart
failure is prescribed lisinopril as part of his pharmacologic management plan. The healthcare
provider explains that this medication improves cardiac function and reduces blood pressure by
interfering with the renin-angiotensin-aldosterone system (RAAS). Which of the following best
describes the primary pharmacologic mechanism of action of lisinopril?
A. Blocking calcium influx into vascular smooth muscle cells resulting in vasodilation
B. Inhibiting beta-1 adrenergic receptors in the heart to reduce cardiac output
C. Inhibiting angiotensin-converting enzyme, thereby reducing angiotensin II production
and decreasing vasoconstriction
D. Increasing sodium and water excretion by directly stimulating renal tubules
Correct Answer: C. Inhibiting angiotensin-converting enzyme, thereby reducing
angiotensin II production and decreasing vasoconstriction
Rationale:
Lisinopril is an ACE inhibitor. It prevents the conversion of angiotensin I into angiotensin II,
which is a potent vasoconstrictor. Reduced angiotensin II leads to vasodilation, decreased
aldosterone secretion, reduced sodium and water retention, and decreased blood pressure. This
also reduces cardiac workload in heart failure.
Question 2
A nurse is monitoring a patient who has been receiving intravenous morphine sulfate following
major abdominal surgery. Which of the following physiologic effects should the nurse recognize
as the most clinically significant and potentially life-threatening adverse effect associated with
morphine administration?
A. Increased gastrointestinal motility leading to diarrhea
B. Elevated blood pressure caused by sympathetic stimulation
C. Respiratory depression resulting from suppression of the brainstem respiratory centers
D. Increased alertness due to central nervous system stimulation
Correct Answer: C. Respiratory depression resulting from suppression of the brainstem
respiratory centers
,Rationale:
Morphine is an opioid agonist that binds to mu receptors in the central nervous system. This
suppresses the brainstem respiratory center, reducing respiratory rate and depth. Respiratory
depression is the most serious adverse effect and can lead to death if not monitored.
Question 3
A patient diagnosed with type 1 diabetes mellitus requires insulin therapy to regulate blood
glucose levels. The healthcare provider explains that insulin lowers blood glucose by facilitating
the movement of glucose into cells. Which of the following best explains the primary cellular
effect of insulin?
A. Preventing glucose absorption in the intestine
B. Stimulating glycogen breakdown in the liver
C. Promoting cellular uptake of glucose and increasing glycogen synthesis
D. Increasing renal excretion of glucose
Correct Answer: C. Promoting cellular uptake of glucose and increasing glycogen synthesis
Rationale:
Insulin facilitates glucose transport into muscle and fat cells by activating glucose transporters
(GLUT4). It also promotes glycogen synthesis in the liver and muscle, lowering blood glucose
levels.
Question 4
A patient receiving gentamicin for treatment of a severe gram-negative bacterial infection is at
risk for serious adverse effects. Which of the following complications should be most closely
monitored due to the known toxicity profile of aminoglycosides?
A. Hepatotoxicity and liver failure
B. Bone marrow suppression and anemia
C. Nephrotoxicity and ototoxicity due to accumulation in renal and inner ear tissues
D. Severe hypotension due to vasodilation
Correct Answer: C. Nephrotoxicity and ototoxicity due to accumulation in renal and inner
ear tissues
Rationale:
Gentamicin accumulates in kidney and inner ear tissues, causing kidney damage and hearing
loss. Renal function and hearing must be monitored.
, Question 5
A patient with asthma is prescribed albuterol as a rescue medication during acute bronchospasm
episodes. Which of the following best describes the mechanism by which albuterol improves
airflow in the lungs?
A. Blocking histamine receptors in bronchial smooth muscle
B. Inhibiting inflammatory mediators in airway tissues
C. Stimulating beta-2 adrenergic receptors causing bronchodilation
D. Reducing mucus production by suppressing glandular secretion
Correct Answer: C. Stimulating beta-2 adrenergic receptors causing bronchodilation
Rationale:
Albuterol is a beta-2 agonist. It relaxes bronchial smooth muscle, opening airways and
improving breathing.
Question 6
A patient taking warfarin requires careful monitoring to prevent complications. Which laboratory
test provides the most accurate assessment of the therapeutic effectiveness of warfarin therapy?
A. Activated partial thromboplastin time (aPTT)
B. Platelet count
C. Hemoglobin level
D. International normalized ratio (INR)
Correct Answer: D. International normalized ratio (INR)
Rationale:
Warfarin affects clotting factors measured by PT/INR. INR ensures blood is anticoagulated
safely without excessive bleeding risk.
Question 7
A patient is prescribed furosemide to treat fluid overload associated with heart failure. The nurse
understands that this medication produces its therapeutic effect primarily by acting on which part
of the nephron?