,Pharmacology Advanced Prep HESI RN:
Master NGN-Style Clinical Pharmacology
Questions & Detailed Explanations
Subject: Advanced Pharmacological Principles & Clinical Application
Question 1: A client with severe sepsis is receiving a continuous infusion of norepinephrine. The
nurse notes the infusion site is cool, pale, and edematous. What is the priority nursing action?
A) Apply a warm compress to the site to promote vasodilation.
B) Stop the infusion and aspirate residual medication from the catheter.
C) Administer phentolamine mesylate subcutaneously to the affected area.
D) Elevate the extremity and continue the infusion in a different vein.
Correct Answer: B) Stop the infusion and aspirate residual medication from the catheter.
Explanation: Norepinephrine is a potent vesicant. Upon signs of extravasation, the immediate
priority is to stop the infusion to prevent further tissue damage. Aspiration of the remaining drug
from the catheter is indicated before removal. While phentolamine (C) is a specific antidote, the
mechanical cessation and site management take clinical precedence. Warm compresses (A) are
generally contraindicated for peripheral extravasations of vasopressors as they may spread the
drug.
Question 2: A client is prescribed oral amiodarone for recurrent atrial fibrillation. Which baseline
assessment must be completed and documented before therapy is initiated to monitor for long-
term adverse effects?
A) Serum magnesium and phosphate levels.
B) Pulmonary function tests (PFTs) and chest X-ray.
C) Renal clearance measured by 24-hour urine collection.
D) Fasting blood glucose and HbA1c levels.
Correct Answer: B) Pulmonary function tests (PFTs) and chest X-ray.
Explanation: Amiodarone is associated with a severe and potentially fatal adverse effect of
pulmonary toxicity, including interstitial pneumonitis and pulmonary fibrosis. Baseline
pulmonary function studies and chest X-rays are mandatory to establish a reference point for
,monitoring future changes. While thyroid and liver function are also monitored, PFTs are the
critical baseline for pulmonary assessment.
Question 3: A client with a mechanical heart valve is maintained on warfarin therapy. The client
reports starting a new herbal supplement, St. John’s Wort. Which laboratory change does the
nurse anticipate?
A) An increase in the International Normalized Ratio (INR).
B) A decrease in the International Normalized Ratio (INR).
C) An increase in the activated partial thromboplastin time (aPTT).
D) A decrease in the prothrombin time (PT).
Correct Answer: B) A decrease in the International Normalized Ratio (INR).
Explanation: St. John’s Wort is a potent inducer of hepatic cytochrome P450 enzymes
(specifically CYP3A4), which significantly accelerates the metabolism of warfarin. Increased
metabolism results in lower serum levels of the drug, leading to a decreased INR and a
heightened risk of therapeutic failure (thrombosis). While warfarin is monitored via INR, aPTT
(C) is for heparin monitoring.
Question 4: A client experiencing an acute exacerbation of multiple sclerosis is prescribed a
high-dose IV methylprednisolone pulse. Which nursing intervention is most critical to prevent
common complications?
A) Monitor serum calcium levels every 4 hours.
B) Assess blood glucose levels due to the risk of hyperglycemia.
C) Administer the medication with a high-fiber snack to prevent constipation.
D) Auscultate heart sounds for signs of fluid overload.
Correct Answer: B) Assess blood glucose levels due to the risk of hyperglycemia.
Explanation: High-dose glucocorticoids induce significant gluconeogenesis and insulin
resistance, often leading to acute hyperglycemia even in non-diabetic clients. While fluid
retention (D) is a risk, glucose monitoring is a critical safety assessment during high-dose pulse
therapy to prevent metabolic crisis.
Question 5: A client is receiving vancomycin 1g IV over 60 minutes. The nurse notes the client’s
skin has developed a reddish flush on the face, neck, and upper chest, and the client is
complaining of pruritus. What is the nurse's priority action?
, A) Continue the infusion but administer an antihistamine.
B) Stop the infusion immediately to assess for anaphylaxis.
C) Increase the IV fluid rate to dilute the medication.
D) Slow the infusion rate to 120 minutes and notify the provider.
Correct Answer: D) Slow the infusion rate to 120 minutes and notify the provider.
Explanation: The client is exhibiting "Red Man Syndrome," a histamine-mediated infusion
reaction common with vancomycin. It is not a true allergic reaction (anaphylaxis). The standard
intervention is to stop or slow the infusion rate and contact the provider; the medication can
usually be restarted at a slower rate once symptoms resolve.
Question 6: A client with heart failure is receiving digoxin. Which laboratory finding most
necessitates holding the scheduled dose of digoxin?
A) Serum potassium 3.0 mEq/L
B) Serum creatinine 1.4 mg/dL
C) Serum sodium 135 mEq/L
D) Serum calcium 9.0 mg/dL
Correct Answer: A) Serum potassium 3.0 mEq/L
Explanation: Hypokalemia increases myocardial sensitivity to digoxin, significantly elevating the
risk of digoxin toxicity and life-threatening arrhythmias (e.g., AV block, ventricular
tachycardia). Digoxin competes with potassium for binding sites on the Na+/K+-ATPase pump.
When potassium is low, digoxin binding is enhanced, potentiating toxic effects.
Question 7: A client is prescribed lithium carbonate for bipolar disorder. The nurse assesses the
client and finds coarse hand tremors, ataxia, and severe diarrhea. These symptoms are most
consistent with:
A) Therapeutic response to lithium.
B) Expected side effects of long-term therapy.
C) Moderate to severe lithium toxicity.
D) Emergent neuroleptic malignant syndrome.
Correct Answer: C) Moderate to severe lithium toxicity.
Master NGN-Style Clinical Pharmacology
Questions & Detailed Explanations
Subject: Advanced Pharmacological Principles & Clinical Application
Question 1: A client with severe sepsis is receiving a continuous infusion of norepinephrine. The
nurse notes the infusion site is cool, pale, and edematous. What is the priority nursing action?
A) Apply a warm compress to the site to promote vasodilation.
B) Stop the infusion and aspirate residual medication from the catheter.
C) Administer phentolamine mesylate subcutaneously to the affected area.
D) Elevate the extremity and continue the infusion in a different vein.
Correct Answer: B) Stop the infusion and aspirate residual medication from the catheter.
Explanation: Norepinephrine is a potent vesicant. Upon signs of extravasation, the immediate
priority is to stop the infusion to prevent further tissue damage. Aspiration of the remaining drug
from the catheter is indicated before removal. While phentolamine (C) is a specific antidote, the
mechanical cessation and site management take clinical precedence. Warm compresses (A) are
generally contraindicated for peripheral extravasations of vasopressors as they may spread the
drug.
Question 2: A client is prescribed oral amiodarone for recurrent atrial fibrillation. Which baseline
assessment must be completed and documented before therapy is initiated to monitor for long-
term adverse effects?
A) Serum magnesium and phosphate levels.
B) Pulmonary function tests (PFTs) and chest X-ray.
C) Renal clearance measured by 24-hour urine collection.
D) Fasting blood glucose and HbA1c levels.
Correct Answer: B) Pulmonary function tests (PFTs) and chest X-ray.
Explanation: Amiodarone is associated with a severe and potentially fatal adverse effect of
pulmonary toxicity, including interstitial pneumonitis and pulmonary fibrosis. Baseline
pulmonary function studies and chest X-rays are mandatory to establish a reference point for
,monitoring future changes. While thyroid and liver function are also monitored, PFTs are the
critical baseline for pulmonary assessment.
Question 3: A client with a mechanical heart valve is maintained on warfarin therapy. The client
reports starting a new herbal supplement, St. John’s Wort. Which laboratory change does the
nurse anticipate?
A) An increase in the International Normalized Ratio (INR).
B) A decrease in the International Normalized Ratio (INR).
C) An increase in the activated partial thromboplastin time (aPTT).
D) A decrease in the prothrombin time (PT).
Correct Answer: B) A decrease in the International Normalized Ratio (INR).
Explanation: St. John’s Wort is a potent inducer of hepatic cytochrome P450 enzymes
(specifically CYP3A4), which significantly accelerates the metabolism of warfarin. Increased
metabolism results in lower serum levels of the drug, leading to a decreased INR and a
heightened risk of therapeutic failure (thrombosis). While warfarin is monitored via INR, aPTT
(C) is for heparin monitoring.
Question 4: A client experiencing an acute exacerbation of multiple sclerosis is prescribed a
high-dose IV methylprednisolone pulse. Which nursing intervention is most critical to prevent
common complications?
A) Monitor serum calcium levels every 4 hours.
B) Assess blood glucose levels due to the risk of hyperglycemia.
C) Administer the medication with a high-fiber snack to prevent constipation.
D) Auscultate heart sounds for signs of fluid overload.
Correct Answer: B) Assess blood glucose levels due to the risk of hyperglycemia.
Explanation: High-dose glucocorticoids induce significant gluconeogenesis and insulin
resistance, often leading to acute hyperglycemia even in non-diabetic clients. While fluid
retention (D) is a risk, glucose monitoring is a critical safety assessment during high-dose pulse
therapy to prevent metabolic crisis.
Question 5: A client is receiving vancomycin 1g IV over 60 minutes. The nurse notes the client’s
skin has developed a reddish flush on the face, neck, and upper chest, and the client is
complaining of pruritus. What is the nurse's priority action?
, A) Continue the infusion but administer an antihistamine.
B) Stop the infusion immediately to assess for anaphylaxis.
C) Increase the IV fluid rate to dilute the medication.
D) Slow the infusion rate to 120 minutes and notify the provider.
Correct Answer: D) Slow the infusion rate to 120 minutes and notify the provider.
Explanation: The client is exhibiting "Red Man Syndrome," a histamine-mediated infusion
reaction common with vancomycin. It is not a true allergic reaction (anaphylaxis). The standard
intervention is to stop or slow the infusion rate and contact the provider; the medication can
usually be restarted at a slower rate once symptoms resolve.
Question 6: A client with heart failure is receiving digoxin. Which laboratory finding most
necessitates holding the scheduled dose of digoxin?
A) Serum potassium 3.0 mEq/L
B) Serum creatinine 1.4 mg/dL
C) Serum sodium 135 mEq/L
D) Serum calcium 9.0 mg/dL
Correct Answer: A) Serum potassium 3.0 mEq/L
Explanation: Hypokalemia increases myocardial sensitivity to digoxin, significantly elevating the
risk of digoxin toxicity and life-threatening arrhythmias (e.g., AV block, ventricular
tachycardia). Digoxin competes with potassium for binding sites on the Na+/K+-ATPase pump.
When potassium is low, digoxin binding is enhanced, potentiating toxic effects.
Question 7: A client is prescribed lithium carbonate for bipolar disorder. The nurse assesses the
client and finds coarse hand tremors, ataxia, and severe diarrhea. These symptoms are most
consistent with:
A) Therapeutic response to lithium.
B) Expected side effects of long-term therapy.
C) Moderate to severe lithium toxicity.
D) Emergent neuroleptic malignant syndrome.
Correct Answer: C) Moderate to severe lithium toxicity.
