NCLEX-RN Pharmacology Hematologic
System Exam |
20 Original ATI & NGN Style Practice
Questions with Detailed Rationales
Question 1
Clinical Scenario
A 65-year-old male is admitted to the medical-surgical unit with a
diagnosis of deep vein thrombosis (DVT) in his left lower extremity.
The provider prescribes a continuous intravenous infusion of
unfractionated heparin. The patient has no known drug allergies and
his baseline laboratory values are within normal limits.
Question Stem
Which laboratory value should the nurse monitor to determine the
therapeutic effect of this medication?
A. Prothrombin time (PT)
B. Activated partial thromboplastin time (aPTT)
C. International Normalized Ratio (INR)
D. Platelet count
,Correct Answer
Correct Answer: B. Activated partial thromboplastin time (aPTT)
Detailed Rationale
Unfractionated heparin is a rapid-acting anticoagulant that works by
enhancing the activity of antithrombin III, which inactivates
thrombin and factor Xa. The therapeutic effect of IV heparin is
monitored using the activated partial thromboplastin time (aPTT).
The goal is typically to maintain the aPTT at 1.5 to 2 times the normal
control value (usually 60–80 seconds, depending on the laboratory's
reference range) to ensure adequate anticoagulation without
causing excessive bleeding. Prothrombin time (PT) and the
International Normalized Ratio (INR) are used to monitor the
therapeutic effects of warfarin, not heparin. While the platelet count
must be monitored regularly (every 2–3 days) during heparin therapy
to detect heparin-induced thrombocytopenia (HIT), it is a safety
monitoring parameter for an adverse effect, not a measure of the
drug's therapeutic anticoagulant effect.
Learning Objective
Identify the appropriate laboratory test for monitoring
unfractionated heparin therapy.
Differentiate between laboratory monitoring parameters for various
anticoagulant medications.
Recognize the therapeutic range for aPTT in patients receiving IV
heparin.
Medication Safety Focus
Monitoring
,Question 2
Clinical Scenario
A 58-year-old female is being discharged home after being
diagnosed with atrial fibrillation. She is prescribed warfarin 5 mg
orally once daily. The nurse is providing discharge education
regarding dietary modifications and medication safety.
Question Stem
Which statement by the client indicates a need for further teaching?
A. "I will use a soft-bristled toothbrush and an electric razor."
B. "I will report any unusual bruising or bleeding to my provider."
C. "I will significantly increase my intake of spinach and kale to be
healthier."
D. "I will go to the lab weekly to get my INR checked as directed."
Correct Answer
Correct Answer: C. "I will significantly increase my intake of spinach
and kale to be healthier."
Detailed Rationale
Warfarin is a vitamin K antagonist. Foods high in vitamin K, such as
spinach, kale, broccoli, and Brussels sprouts, can directly
antagonize the effects of warfarin, leading to a subtherapeutic INR
and an increased risk of thrombus formation. The key patient
teaching point is not to avoid vitamin K entirely, but to maintain a
consistent daily intake so the warfarin dose can be accurately
adjusted. A sudden, significant increase in vitamin K-rich foods will
decrease warfarin's efficacy. Using a soft-bristled toothbrush and
, electric razor (Option A), reporting unusual bruising (Option B), and
adhering to regular INR monitoring (Option D) are all correct and
essential safety measures for a patient on warfarin therapy.
Learning Objective
Educate patients on the interaction between vitamin K-rich foods
and warfarin.
Recognize appropriate bleeding precautions for patients on oral
anticoagulants.
Emphasize the importance of consistent dietary habits and routine
laboratory monitoring.
Medication Safety Focus
Patient education
Question 3
Clinical Scenario
A 72-year-old male is on postoperative day 1 following a total hip
replacement. The provider prescribes enoxaparin 40 mg
subcutaneously once daily for deep vein thrombosis prophylaxis.
The nurse prepares to administer the medication using a prefilled
syringe.
Question Stem
Which action by the nurse is appropriate when administering this
medication?
A. Aspirate the syringe before injecting to ensure no blood vessel is
entered.
System Exam |
20 Original ATI & NGN Style Practice
Questions with Detailed Rationales
Question 1
Clinical Scenario
A 65-year-old male is admitted to the medical-surgical unit with a
diagnosis of deep vein thrombosis (DVT) in his left lower extremity.
The provider prescribes a continuous intravenous infusion of
unfractionated heparin. The patient has no known drug allergies and
his baseline laboratory values are within normal limits.
Question Stem
Which laboratory value should the nurse monitor to determine the
therapeutic effect of this medication?
A. Prothrombin time (PT)
B. Activated partial thromboplastin time (aPTT)
C. International Normalized Ratio (INR)
D. Platelet count
,Correct Answer
Correct Answer: B. Activated partial thromboplastin time (aPTT)
Detailed Rationale
Unfractionated heparin is a rapid-acting anticoagulant that works by
enhancing the activity of antithrombin III, which inactivates
thrombin and factor Xa. The therapeutic effect of IV heparin is
monitored using the activated partial thromboplastin time (aPTT).
The goal is typically to maintain the aPTT at 1.5 to 2 times the normal
control value (usually 60–80 seconds, depending on the laboratory's
reference range) to ensure adequate anticoagulation without
causing excessive bleeding. Prothrombin time (PT) and the
International Normalized Ratio (INR) are used to monitor the
therapeutic effects of warfarin, not heparin. While the platelet count
must be monitored regularly (every 2–3 days) during heparin therapy
to detect heparin-induced thrombocytopenia (HIT), it is a safety
monitoring parameter for an adverse effect, not a measure of the
drug's therapeutic anticoagulant effect.
Learning Objective
Identify the appropriate laboratory test for monitoring
unfractionated heparin therapy.
Differentiate between laboratory monitoring parameters for various
anticoagulant medications.
Recognize the therapeutic range for aPTT in patients receiving IV
heparin.
Medication Safety Focus
Monitoring
,Question 2
Clinical Scenario
A 58-year-old female is being discharged home after being
diagnosed with atrial fibrillation. She is prescribed warfarin 5 mg
orally once daily. The nurse is providing discharge education
regarding dietary modifications and medication safety.
Question Stem
Which statement by the client indicates a need for further teaching?
A. "I will use a soft-bristled toothbrush and an electric razor."
B. "I will report any unusual bruising or bleeding to my provider."
C. "I will significantly increase my intake of spinach and kale to be
healthier."
D. "I will go to the lab weekly to get my INR checked as directed."
Correct Answer
Correct Answer: C. "I will significantly increase my intake of spinach
and kale to be healthier."
Detailed Rationale
Warfarin is a vitamin K antagonist. Foods high in vitamin K, such as
spinach, kale, broccoli, and Brussels sprouts, can directly
antagonize the effects of warfarin, leading to a subtherapeutic INR
and an increased risk of thrombus formation. The key patient
teaching point is not to avoid vitamin K entirely, but to maintain a
consistent daily intake so the warfarin dose can be accurately
adjusted. A sudden, significant increase in vitamin K-rich foods will
decrease warfarin's efficacy. Using a soft-bristled toothbrush and
, electric razor (Option A), reporting unusual bruising (Option B), and
adhering to regular INR monitoring (Option D) are all correct and
essential safety measures for a patient on warfarin therapy.
Learning Objective
Educate patients on the interaction between vitamin K-rich foods
and warfarin.
Recognize appropriate bleeding precautions for patients on oral
anticoagulants.
Emphasize the importance of consistent dietary habits and routine
laboratory monitoring.
Medication Safety Focus
Patient education
Question 3
Clinical Scenario
A 72-year-old male is on postoperative day 1 following a total hip
replacement. The provider prescribes enoxaparin 40 mg
subcutaneously once daily for deep vein thrombosis prophylaxis.
The nurse prepares to administer the medication using a prefilled
syringe.
Question Stem
Which action by the nurse is appropriate when administering this
medication?
A. Aspirate the syringe before injecting to ensure no blood vessel is
entered.
