NURS 6521 Exam 1 V3 | NURS 6521
Advanced Pharmacology | Actual Q&A
with Rationale (NURS6521 Exam 1) |
Walden University
1. A 72-year-old patient with declining renal function is prescribed a medication that is
primarily excreted by the kidneys. Which pharmacokinetic principle should the nurse
practitioner consider most critical for this patient?
A. First-pass metabolism
B. Increased volume of distribution
C. Reduced drug clearance and potential toxicity
D. Enhanced gastric absorption
Answer: C
Rationale: Renal function declines with age, which significantly impacts the elimination
phase of pharmacokinetics. When clearance is reduced, the half-life of a drug increases,
leading to higher plasma concentrations. This necessitates dosage adjustments to prevent
drug accumulation and systemic toxicity in geriatric patients.
2. Which statement best describes the ‘first-pass effect’ in pharmacokinetics?
A. The metabolism of an oral drug by the liver before it reaches systemic circulation
B. The excretion of a drug through the glomerular filtration system.
,C. The binding of a drug to plasma albumin upon entering the bloodstream.
D. The initial distribution of a drug into highly vascularized organs like the heart.
Answer: A
Rationale: The first-pass effect occurs when an orally administered drug is absorbed from
the GI tract and transported via the portal vein to the liver. Extensive hepatic metabolism
can significantly reduce the bioavailability of the active drug before it reaches the rest of
the body. This phenomenon explains why some drugs require much higher oral doses than
intravenous doses.
3. An Advanced Practice Nurse is considering a drug that is a known Cytochrome P450
(CYP3A4) inhibitor. What is the likely result if this drug is administered with another drug
metabolized by the same enzyme?
A. The serum levels of the second drug will decrease.
B. The second drug will undergo rapid excretion.
C. The serum levels of the second drug will increase, raising the risk of toxicity
D. There will be no change in drug concentrations.
Answer: C
Rationale: Enzyme inhibition slows down the metabolic breakdown of substrate drugs by
the Cytochrome P450 system. When the metabolic rate decreases, the drug remains in the
systemic circulation longer than intended. This interaction frequently leads to adverse
effects and requires careful monitoring or dosage reduction of the substrate drug.
, 4. In the context of drug-receptor interactions, what defines an ‘agonist’?
A. A drug that blocks the action of endogenous ligands.
B. A drug that binds to a receptor and produces a biological response
C. A substance that binds irreversibly to a receptor without effect.
D. A medication that prevents other drugs from binding to the site.
Answer: B
Rationale: Agonists are molecules that mimic the activity of endogenous regulatory
molecules by binding to and activating specific receptors. By activating these receptors,
they trigger a series of biochemical events that result in a physiological change. The
magnitude of the response is typically proportional to the number of receptors occupied.
5. A pregnant patient is prescribed a medication labeled as Pregnancy Category X. What does
this classification signify?
A. The drug is safe to use if the benefits outweigh the minor risks.
B. Animal studies show no risk, but human studies are lacking.
C. The drug is contraindicated because the risks of fetal harm clearly outweigh any possible
benefit
D. The drug has not been tested in pregnant women yet.
Answer: C
Advanced Pharmacology | Actual Q&A
with Rationale (NURS6521 Exam 1) |
Walden University
1. A 72-year-old patient with declining renal function is prescribed a medication that is
primarily excreted by the kidneys. Which pharmacokinetic principle should the nurse
practitioner consider most critical for this patient?
A. First-pass metabolism
B. Increased volume of distribution
C. Reduced drug clearance and potential toxicity
D. Enhanced gastric absorption
Answer: C
Rationale: Renal function declines with age, which significantly impacts the elimination
phase of pharmacokinetics. When clearance is reduced, the half-life of a drug increases,
leading to higher plasma concentrations. This necessitates dosage adjustments to prevent
drug accumulation and systemic toxicity in geriatric patients.
2. Which statement best describes the ‘first-pass effect’ in pharmacokinetics?
A. The metabolism of an oral drug by the liver before it reaches systemic circulation
B. The excretion of a drug through the glomerular filtration system.
,C. The binding of a drug to plasma albumin upon entering the bloodstream.
D. The initial distribution of a drug into highly vascularized organs like the heart.
Answer: A
Rationale: The first-pass effect occurs when an orally administered drug is absorbed from
the GI tract and transported via the portal vein to the liver. Extensive hepatic metabolism
can significantly reduce the bioavailability of the active drug before it reaches the rest of
the body. This phenomenon explains why some drugs require much higher oral doses than
intravenous doses.
3. An Advanced Practice Nurse is considering a drug that is a known Cytochrome P450
(CYP3A4) inhibitor. What is the likely result if this drug is administered with another drug
metabolized by the same enzyme?
A. The serum levels of the second drug will decrease.
B. The second drug will undergo rapid excretion.
C. The serum levels of the second drug will increase, raising the risk of toxicity
D. There will be no change in drug concentrations.
Answer: C
Rationale: Enzyme inhibition slows down the metabolic breakdown of substrate drugs by
the Cytochrome P450 system. When the metabolic rate decreases, the drug remains in the
systemic circulation longer than intended. This interaction frequently leads to adverse
effects and requires careful monitoring or dosage reduction of the substrate drug.
, 4. In the context of drug-receptor interactions, what defines an ‘agonist’?
A. A drug that blocks the action of endogenous ligands.
B. A drug that binds to a receptor and produces a biological response
C. A substance that binds irreversibly to a receptor without effect.
D. A medication that prevents other drugs from binding to the site.
Answer: B
Rationale: Agonists are molecules that mimic the activity of endogenous regulatory
molecules by binding to and activating specific receptors. By activating these receptors,
they trigger a series of biochemical events that result in a physiological change. The
magnitude of the response is typically proportional to the number of receptors occupied.
5. A pregnant patient is prescribed a medication labeled as Pregnancy Category X. What does
this classification signify?
A. The drug is safe to use if the benefits outweigh the minor risks.
B. Animal studies show no risk, but human studies are lacking.
C. The drug is contraindicated because the risks of fetal harm clearly outweigh any possible
benefit
D. The drug has not been tested in pregnant women yet.
Answer: C
