2023 ATI RN Pharmacology Proctor Actual Exams |
NGN-Style Questions | ATI Nursing Exam, Exams of
2026 Exam · 200 Questions · With Rationales
2023ati.
ATI RN Pharmacology Proctor Actual Exams | NGN-Style Questions | ATI Nursing Exam, Exams of Pharmacology
Question: 1 of 200
A patient receiving IV heparin develops a sudden drop in platelet count from 200,000 to 50,000/mcL. Which
antibody-antigen complex is most likely responsible for this complication?
A. IgG-heparin-platelet factor 4 complex
B. IgM-heparin-thrombomodulin complex
C. IgA-heparin-von Willebrand factor complex
D. IgE-heparin-fibrinogen complex
PREVIOUS CONTINUE
A patient receiving IV heparin develops a sudden drop in platelet count from 200,000 to
50,000/mcL. Which antibody-antigen complex is most likely responsible for this
complication?
' A. IgG-heparin-platelet factor 4 complex
B. IgM-heparin-thrombomodulin complex
C. IgA-heparin-von Willebrand factor complex
D. IgE-heparin-fibrinogen complex
Correct Answer: A
Heparin-induced thrombocytopenia (HIT) is caused by IgG antibodies that bind to heparin-platelet factor 4
complexes on platelet surfaces, leading to platelet activation and consumption. IgM and IgA are not typically
involved. Thrombomodulin and von Willebrand factor are not the primary targets.
Page 1 | 2023 ATI RN Pharmacology Proctor Actual Exams | NGN-Style Questions | ATI Nursing Exam, Exams of Pharmacology 2026
, 2023 ATI RN Pharmacology Proctor Actual Exams |
NGN-Style Questions | ATI Nursing Exam, Exams of
2026 Exam · 200 Questions · With Rationales
2023ati.
ATI RN Pharmacology Proctor Actual Exams | NGN-Style Questions | ATI Nursing Exam, Exams of Pharmacology
Question: 2 of 200
A patient with severe hypertension is started on nitroprusside. Which metabolite is responsible for the risk of
cyanide toxicity, and which cofactor is essential for its detoxification?
A. Cyanide; thiosulfate
B. Thiocyanate; vitamin B12
C. Nitric oxide; cysteine
D. Cyanide; glutathione
PREVIOUS CONTINUE
A patient with severe hypertension is started on nitroprusside. Which metabolite is
responsible for the risk of cyanide toxicity, and which cofactor is essential for its
detoxification?
' A. Cyanide; thiosulfate
B. Thiocyanate; vitamin B12
C. Nitric oxide; cysteine
D. Cyanide; glutathione
Correct Answer: A
Nitroprusside releases cyanide, which is normally detoxified by the liver using thiosulfate to form thiocyanate.
Thiocyanate accumulation is associated with toxicity but is less acute. Vitamin B12 and glutathione are not
primary detoxification cofactors for cyanide in this context.
Page 2 | 2023 ATI RN Pharmacology Proctor Actual Exams | NGN-Style Questions | ATI Nursing Exam, Exams of Pharmacology 2026
, 2023 ATI RN Pharmacology Proctor Actual Exams |
NGN-Style Questions | ATI Nursing Exam, Exams of
2026 Exam · 200 Questions · With Rationales
2023ati.
ATI RN Pharmacology Proctor Actual Exams | NGN-Style Questions | ATI Nursing Exam, Exams of Pharmacology
Question: 3 of 200
A patient on long-term phenytoin therapy develops megaloblastic anemia. Which vitamin deficiency is most
likely, and what is the mechanism?
A. Folate deficiency due to impaired absorption
B. Vitamin B12 deficiency due to decreased intrinsic factor
C. Folate deficiency due to increased metabolism
D. Vitamin B12 deficiency due to competitive inhibition
PREVIOUS CONTINUE
A patient on long-term phenytoin therapy develops megaloblastic anemia. Which vitamin
deficiency is most likely, and what is the mechanism?
A. Folate deficiency due to impaired absorption
B. Vitamin B12 deficiency due to decreased intrinsic factor
' C. Folate deficiency due to increased metabolism
D. Vitamin B12 deficiency due to competitive inhibition
Correct Answer: C
Phenytoin induces hepatic microsomal enzymes that accelerate folate metabolism, leading to folate deficiency
and megaloblastic anemia. Phenytoin does not impair folate absorption or directly affect vitamin B12. Intrinsic
factor is not impacted.
Page 3 | 2023 ATI RN Pharmacology Proctor Actual Exams | NGN-Style Questions | ATI Nursing Exam, Exams of Pharmacology 2026
, 2023 ATI RN Pharmacology Proctor Actual Exams |
NGN-Style Questions | ATI Nursing Exam, Exams of
2026 Exam · 200 Questions · With Rationales
2023ati.
ATI RN Pharmacology Proctor Actual Exams | NGN-Style Questions | ATI Nursing Exam, Exams of Pharmacology
Question: 4 of 200
A patient with renal impairment (CrCl 20 mL/min) requires a drug that is primarily renally eliminated. Which of
the following dosing adjustments is most appropriate for a drug with a narrow therapeutic index?
A. Increase the dose to achieve therapeutic levels
B. Extend the dosing interval and reduce the dose
C. Administer the normal dose less frequently
D. Use the standard dose but monitor trough levels
PREVIOUS CONTINUE
A patient with renal impairment (CrCl 20 mL/min) requires a drug that is primarily renally
eliminated. Which of the following dosing adjustments is most appropriate for a drug with
a narrow therapeutic index?
A. Increase the dose to achieve therapeutic levels
' B. Extend the dosing interval and reduce the dose
C. Administer the normal dose less frequently
D. Use the standard dose but monitor trough levels
Correct Answer: B
In severe renal impairment, both dose reduction and interval extension are often needed to avoid accumulation,
especially for narrow therapeutic index drugs. Simply extending the interval (C) may still lead to toxic peaks.
Increasing dose (A) is dangerous. Monitoring alone (D) without adjustment is insufficient.
Page 4 | 2023 ATI RN Pharmacology Proctor Actual Exams | NGN-Style Questions | ATI Nursing Exam, Exams of Pharmacology 2026
NGN-Style Questions | ATI Nursing Exam, Exams of
2026 Exam · 200 Questions · With Rationales
2023ati.
ATI RN Pharmacology Proctor Actual Exams | NGN-Style Questions | ATI Nursing Exam, Exams of Pharmacology
Question: 1 of 200
A patient receiving IV heparin develops a sudden drop in platelet count from 200,000 to 50,000/mcL. Which
antibody-antigen complex is most likely responsible for this complication?
A. IgG-heparin-platelet factor 4 complex
B. IgM-heparin-thrombomodulin complex
C. IgA-heparin-von Willebrand factor complex
D. IgE-heparin-fibrinogen complex
PREVIOUS CONTINUE
A patient receiving IV heparin develops a sudden drop in platelet count from 200,000 to
50,000/mcL. Which antibody-antigen complex is most likely responsible for this
complication?
' A. IgG-heparin-platelet factor 4 complex
B. IgM-heparin-thrombomodulin complex
C. IgA-heparin-von Willebrand factor complex
D. IgE-heparin-fibrinogen complex
Correct Answer: A
Heparin-induced thrombocytopenia (HIT) is caused by IgG antibodies that bind to heparin-platelet factor 4
complexes on platelet surfaces, leading to platelet activation and consumption. IgM and IgA are not typically
involved. Thrombomodulin and von Willebrand factor are not the primary targets.
Page 1 | 2023 ATI RN Pharmacology Proctor Actual Exams | NGN-Style Questions | ATI Nursing Exam, Exams of Pharmacology 2026
, 2023 ATI RN Pharmacology Proctor Actual Exams |
NGN-Style Questions | ATI Nursing Exam, Exams of
2026 Exam · 200 Questions · With Rationales
2023ati.
ATI RN Pharmacology Proctor Actual Exams | NGN-Style Questions | ATI Nursing Exam, Exams of Pharmacology
Question: 2 of 200
A patient with severe hypertension is started on nitroprusside. Which metabolite is responsible for the risk of
cyanide toxicity, and which cofactor is essential for its detoxification?
A. Cyanide; thiosulfate
B. Thiocyanate; vitamin B12
C. Nitric oxide; cysteine
D. Cyanide; glutathione
PREVIOUS CONTINUE
A patient with severe hypertension is started on nitroprusside. Which metabolite is
responsible for the risk of cyanide toxicity, and which cofactor is essential for its
detoxification?
' A. Cyanide; thiosulfate
B. Thiocyanate; vitamin B12
C. Nitric oxide; cysteine
D. Cyanide; glutathione
Correct Answer: A
Nitroprusside releases cyanide, which is normally detoxified by the liver using thiosulfate to form thiocyanate.
Thiocyanate accumulation is associated with toxicity but is less acute. Vitamin B12 and glutathione are not
primary detoxification cofactors for cyanide in this context.
Page 2 | 2023 ATI RN Pharmacology Proctor Actual Exams | NGN-Style Questions | ATI Nursing Exam, Exams of Pharmacology 2026
, 2023 ATI RN Pharmacology Proctor Actual Exams |
NGN-Style Questions | ATI Nursing Exam, Exams of
2026 Exam · 200 Questions · With Rationales
2023ati.
ATI RN Pharmacology Proctor Actual Exams | NGN-Style Questions | ATI Nursing Exam, Exams of Pharmacology
Question: 3 of 200
A patient on long-term phenytoin therapy develops megaloblastic anemia. Which vitamin deficiency is most
likely, and what is the mechanism?
A. Folate deficiency due to impaired absorption
B. Vitamin B12 deficiency due to decreased intrinsic factor
C. Folate deficiency due to increased metabolism
D. Vitamin B12 deficiency due to competitive inhibition
PREVIOUS CONTINUE
A patient on long-term phenytoin therapy develops megaloblastic anemia. Which vitamin
deficiency is most likely, and what is the mechanism?
A. Folate deficiency due to impaired absorption
B. Vitamin B12 deficiency due to decreased intrinsic factor
' C. Folate deficiency due to increased metabolism
D. Vitamin B12 deficiency due to competitive inhibition
Correct Answer: C
Phenytoin induces hepatic microsomal enzymes that accelerate folate metabolism, leading to folate deficiency
and megaloblastic anemia. Phenytoin does not impair folate absorption or directly affect vitamin B12. Intrinsic
factor is not impacted.
Page 3 | 2023 ATI RN Pharmacology Proctor Actual Exams | NGN-Style Questions | ATI Nursing Exam, Exams of Pharmacology 2026
, 2023 ATI RN Pharmacology Proctor Actual Exams |
NGN-Style Questions | ATI Nursing Exam, Exams of
2026 Exam · 200 Questions · With Rationales
2023ati.
ATI RN Pharmacology Proctor Actual Exams | NGN-Style Questions | ATI Nursing Exam, Exams of Pharmacology
Question: 4 of 200
A patient with renal impairment (CrCl 20 mL/min) requires a drug that is primarily renally eliminated. Which of
the following dosing adjustments is most appropriate for a drug with a narrow therapeutic index?
A. Increase the dose to achieve therapeutic levels
B. Extend the dosing interval and reduce the dose
C. Administer the normal dose less frequently
D. Use the standard dose but monitor trough levels
PREVIOUS CONTINUE
A patient with renal impairment (CrCl 20 mL/min) requires a drug that is primarily renally
eliminated. Which of the following dosing adjustments is most appropriate for a drug with
a narrow therapeutic index?
A. Increase the dose to achieve therapeutic levels
' B. Extend the dosing interval and reduce the dose
C. Administer the normal dose less frequently
D. Use the standard dose but monitor trough levels
Correct Answer: B
In severe renal impairment, both dose reduction and interval extension are often needed to avoid accumulation,
especially for narrow therapeutic index drugs. Simply extending the interval (C) may still lead to toxic peaks.
Increasing dose (A) is dangerous. Monitoring alone (D) without adjustment is insufficient.
Page 4 | 2023 ATI RN Pharmacology Proctor Actual Exams | NGN-Style Questions | ATI Nursing Exam, Exams of Pharmacology 2026
