which lab value is critical for monitoring warfarin therapy

ATI RN

ATI RN Comprehensive Exit Exam

1. Which lab value is critical for monitoring warfarin therapy?

A. Monitor INR
B. Monitor platelet count
C. Monitor sodium levels
D. Monitor calcium levels

Correct answer: A

Rationale: The correct answer is A: Monitor INR. INR (International Normalized Ratio) is crucial for monitoring warfarin therapy as it helps assess the therapeutic effectiveness and bleeding risks associated with the medication. INR measures the clotting tendency of blood, which is essential in determining the appropriate dosage of warfarin. Monitoring platelet count (B), sodium levels (C), or calcium levels (D) is not primarily used for assessing warfarin therapy. Platelet count is more relevant in assessing bleeding disorders, while sodium and calcium levels are typically monitored for different medical conditions unrelated to warfarin therapy.

2. A nurse is reviewing the laboratory results of a client who has hypocalcemia. Which of the following findings should the nurse expect?

A. Positive Trousseau's sign
B. Increased deep tendon reflexes
C. Hyperactive bowel sounds
D. Weak, thready pulse

Correct answer: A

Rationale: A positive Trousseau's sign is a key finding in clients with hypocalcemia, indicating neuromuscular irritability. The other choices are not typically associated with hypocalcemia. Increased deep tendon reflexes are more indicative of hypercalcemia. Hyperactive bowel sounds can be seen in hyperactive bowel conditions or diarrhea, not specifically related to hypocalcemia. A weak, thready pulse may indicate cardiovascular issues, such as dehydration, but it is not a typical finding in hypocalcemia.

3. A healthcare professional is preparing to administer an IV fluid bolus of 500 mL over 4 hours to a client who is dehydrated. The healthcare professional should set the IV pump to deliver how many mL/hr?

A. 75 mL/hr.
B. 100 mL/hr.
C. 125 mL/hr.
D. 150 mL/hr.

Correct answer: C

Rationale: Setting the IV pump to 125 mL/hr ensures the correct infusion rate for delivering 500 mL over 4 hours. To calculate the mL/hr rate, divide the total volume to be infused (500 mL) by the total time for infusion (4 hours): 500 mL / 4 hours = 125 mL/hr. Choice A (75 mL/hr) is too low and would result in an insufficient infusion rate, potentially delaying fluid resuscitation. Choice B (100 mL/hr) would also be too low and not deliver the fluid within the specified time frame. Choice D (150 mL/hr) is too high and would infuse the fluid too quickly, potentially causing fluid overload and complications.

4. A client with Raynaud's disease is being cared for by a nurse. What intervention should the nurse implement?

A. Maintain a warm temperature in the client's room.
B. Administer epinephrine for acute episodes.
C. Provide information about stress management.
D. Give glucocorticoid steroid twice a day.

Correct answer: C

Rationale: The correct intervention for a client with Raynaud's disease is to provide information about stress management. Stress can trigger Raynaud's episodes, so managing stress can help reduce the frequency and severity of the condition. Maintaining a warm temperature in the client's room (Choice A) is important to prevent vasoconstriction and worsening of symptoms. Administering epinephrine (Choice B) is not a standard treatment for Raynaud's disease. Giving glucocorticoid steroids (Choice D) is not the primary treatment for Raynaud's disease and is not typically prescribed for this condition.

5. Which medication is used to manage hyperthyroidism?

A. Levothyroxine
B. Methimazole
C. Propylthiouracil
D. Prednisone

Correct answer: B

Rationale: Methimazole is the correct answer. It is commonly used to manage hyperthyroidism by inhibiting the production of thyroid hormones. Levothyroxine (Choice A) is actually a medication used to treat hypothyroidism by supplementing thyroid hormones. Propylthiouracil (Choice C) is another anti-thyroid medication used in the management of hyperthyroidism. Prednisone (Choice D) is a corticosteroid and is not typically used in the treatment of hyperthyroidism.