NCLEX-RN Hematologic System
Pharmacology Exam |
20 Original NCLEX Practice Questions with
Rationales |
Nursing Test Bank & Study Guide
Question 1
Clinical Scenario
A 68-year-old male is admitted with a deep vein thrombosis (DVT) in
his left lower extremity. The provider prescribes an intravenous
continuous infusion of unfractionated heparin. The nurse reviews
the patient’s morning laboratory results before initiating the
infusion.
Question Stem
Which laboratory value should the nurse monitor to determine the
therapeutic effectiveness of this medication?
A. Prothrombin time (PT)
B. International Normalized Ratio (INR)
C. Activated partial thromboplastin time (aPTT)
D. Platelet count
,Correct Answer
Correct Answer: C. Activated partial thromboplastin time (aPTT)
Detailed Rationale
Unfractionated heparin is a rapid-acting anticoagulant that
enhances the activity of antithrombin III, inhibiting thrombin and
factor Xa. The therapeutic effectiveness and safety of intravenous
unfractionated heparin are monitored using the activated partial
thromboplastin time (aPTT). The goal is typically to maintain the
aPTT at 1.5 to 2 times the control value (usually 46–70 seconds,
depending on the laboratory). Option A (PT) and Option B (INR) are
used to monitor the effectiveness of warfarin, not heparin. Option D
(Platelet count) is monitored to detect heparin-induced
thrombocytopenia (HIT), a serious adverse effect, but it does not
measure the therapeutic anticoagulant effect of the drug. Nursing
considerations include assessing for signs of bleeding, avoiding IM
injections, and ensuring protamine sulfate is available as the
specific antidote for heparin overdose.
Learning Objective
Identify the appropriate laboratory monitoring parameter for
unfractionated heparin therapy.
Differentiate between laboratory tests used for various
anticoagulant medications.
Recognize the importance of baseline and ongoing laboratory
assessment in medication safety.
Medication Safety Focus
Monitoring
,Question 2
Clinical Scenario
A 55-year-old female with a mechanical heart valve is being
discharged on warfarin. During discharge teaching, the nurse
evaluates the patient’s understanding of dietary modifications
related to her new medication regimen.
Question Stem
Which statement by the patient indicates a correct understanding of
the teaching?
A. "I will increase my intake of leafy green vegetables to build up my
strength."
B. "I should maintain a consistent intake of foods rich in vitamin K."
C. "I must completely eliminate all broccoli and spinach from my
diet."
D. "I will take my warfarin with a large glass of grapefruit juice every
morning."
Correct Answer
Correct Answer: B. "I should maintain a consistent intake of foods
rich in vitamin K."
Detailed Rationale
Warfarin is a vitamin K antagonist. Fluctuations in dietary vitamin K
intake can significantly alter the medication’s effectiveness, leading
to subtherapeutic levels (risk of thrombosis) or supratherapeutic
levels (risk of bleeding). The correct patient teaching is to maintain a
consistent daily intake of vitamin K-rich foods (e.g., leafy green
, vegetables), rather than drastically increasing or eliminating them.
Option A is incorrect because increasing intake will decrease
warfarin’s effect. Option C is incorrect because complete
elimination is unnecessary and can lead to nutritional deficits;
consistency is the key. Option D is incorrect because grapefruit juice
inhibits CYP450 enzymes, which can increase warfarin levels and
elevate the risk of bleeding. Nurses must emphasize consistency in
diet and regular INR monitoring.
Learning Objective
Explain the interaction between warfarin and dietary vitamin K.
Educate patients on appropriate dietary modifications while taking
warfarin.
Identify drug-food interactions that impact anticoagulant therapy.
Medication Safety Focus
Patient education
Question 3
Clinical Scenario
A 72-year-old female is prescribed enoxaparin 40 mg
subcutaneously once daily for DVT prophylaxis following hip
replacement surgery. The nurse prepares to administer the
medication.
Question Stem
Which action by the nurse is appropriate when administering this
medication?
Pharmacology Exam |
20 Original NCLEX Practice Questions with
Rationales |
Nursing Test Bank & Study Guide
Question 1
Clinical Scenario
A 68-year-old male is admitted with a deep vein thrombosis (DVT) in
his left lower extremity. The provider prescribes an intravenous
continuous infusion of unfractionated heparin. The nurse reviews
the patient’s morning laboratory results before initiating the
infusion.
Question Stem
Which laboratory value should the nurse monitor to determine the
therapeutic effectiveness of this medication?
A. Prothrombin time (PT)
B. International Normalized Ratio (INR)
C. Activated partial thromboplastin time (aPTT)
D. Platelet count
,Correct Answer
Correct Answer: C. Activated partial thromboplastin time (aPTT)
Detailed Rationale
Unfractionated heparin is a rapid-acting anticoagulant that
enhances the activity of antithrombin III, inhibiting thrombin and
factor Xa. The therapeutic effectiveness and safety of intravenous
unfractionated heparin are monitored using the activated partial
thromboplastin time (aPTT). The goal is typically to maintain the
aPTT at 1.5 to 2 times the control value (usually 46–70 seconds,
depending on the laboratory). Option A (PT) and Option B (INR) are
used to monitor the effectiveness of warfarin, not heparin. Option D
(Platelet count) is monitored to detect heparin-induced
thrombocytopenia (HIT), a serious adverse effect, but it does not
measure the therapeutic anticoagulant effect of the drug. Nursing
considerations include assessing for signs of bleeding, avoiding IM
injections, and ensuring protamine sulfate is available as the
specific antidote for heparin overdose.
Learning Objective
Identify the appropriate laboratory monitoring parameter for
unfractionated heparin therapy.
Differentiate between laboratory tests used for various
anticoagulant medications.
Recognize the importance of baseline and ongoing laboratory
assessment in medication safety.
Medication Safety Focus
Monitoring
,Question 2
Clinical Scenario
A 55-year-old female with a mechanical heart valve is being
discharged on warfarin. During discharge teaching, the nurse
evaluates the patient’s understanding of dietary modifications
related to her new medication regimen.
Question Stem
Which statement by the patient indicates a correct understanding of
the teaching?
A. "I will increase my intake of leafy green vegetables to build up my
strength."
B. "I should maintain a consistent intake of foods rich in vitamin K."
C. "I must completely eliminate all broccoli and spinach from my
diet."
D. "I will take my warfarin with a large glass of grapefruit juice every
morning."
Correct Answer
Correct Answer: B. "I should maintain a consistent intake of foods
rich in vitamin K."
Detailed Rationale
Warfarin is a vitamin K antagonist. Fluctuations in dietary vitamin K
intake can significantly alter the medication’s effectiveness, leading
to subtherapeutic levels (risk of thrombosis) or supratherapeutic
levels (risk of bleeding). The correct patient teaching is to maintain a
consistent daily intake of vitamin K-rich foods (e.g., leafy green
, vegetables), rather than drastically increasing or eliminating them.
Option A is incorrect because increasing intake will decrease
warfarin’s effect. Option C is incorrect because complete
elimination is unnecessary and can lead to nutritional deficits;
consistency is the key. Option D is incorrect because grapefruit juice
inhibits CYP450 enzymes, which can increase warfarin levels and
elevate the risk of bleeding. Nurses must emphasize consistency in
diet and regular INR monitoring.
Learning Objective
Explain the interaction between warfarin and dietary vitamin K.
Educate patients on appropriate dietary modifications while taking
warfarin.
Identify drug-food interactions that impact anticoagulant therapy.
Medication Safety Focus
Patient education
Question 3
Clinical Scenario
A 72-year-old female is prescribed enoxaparin 40 mg
subcutaneously once daily for DVT prophylaxis following hip
replacement surgery. The nurse prepares to administer the
medication.
Question Stem
Which action by the nurse is appropriate when administering this
medication?
