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. How should a healthcare professional handle a patient who is refusing to take a prescribed medication?

A. Immediately give the medication
B. Assess the reasons for refusal
C. Document refusal
D. Explore alternative treatment options

Correct answer: B

Rationale: Assessing the reasons for refusal is crucial as it allows the healthcare professional to understand the patient's concerns, which can range from fear of side effects to cost issues. By identifying the underlying reasons, the healthcare professional can tailor their approach to address these specific concerns, potentially improving medication adherence. Giving the medication immediately (Choice A) without understanding the patient's reasons for refusal can lead to further non-compliance. While documenting refusal (Choice C) is important for legal and tracking purposes, it does not directly address the patient's concerns. Exploring alternative treatment options (Choice D) may be considered after understanding the reasons for refusal, but it is not the initial step in managing medication refusal.

3. Which electrolyte imbalance is most concerning in a patient taking digoxin?

A. Monitor potassium levels
B. Monitor calcium levels
C. Monitor sodium levels
D. Monitor magnesium levels

Correct answer: A

Rationale: The correct answer is to monitor potassium levels. Patients taking digoxin are at risk of developing toxicity due to hypokalemia. Low potassium levels can potentiate the toxic effects of digoxin on the heart, leading to serious arrhythmias. Monitoring calcium levels (Choice B) is not the primary concern in patients taking digoxin. While calcium levels play a role in cardiac function, hypocalcemia is not directly associated with digoxin toxicity. Monitoring sodium levels (Choice C) is important for other conditions but is not the primary concern in a patient taking digoxin. Monitoring magnesium levels (Choice D) is also essential, but hypomagnesemia is not as directly linked to digoxin toxicity as hypokalemia.

4. A nurse is caring for a client who has a pulmonary embolism. Which of the following findings indicates the effectiveness of the treatment?

A. A chest x-ray reveals increased density in all lung fields.
B. The client reports feeling less anxious.
C. Diminished breath sounds are auscultated bilaterally.
D. ABG results include pH 7.48, PaO2 77 mm Hg, and PaCO2 47 mm Hg.

Correct answer: B

Rationale: The correct answer is B. In a client with a pulmonary embolism, improvement in anxiety levels can indicate the effectiveness of treatment as it suggests better oxygenation and perfusion. Choices A, C, and D do not directly reflect the effectiveness of treatment for a pulmonary embolism. Increased density in all lung fields on a chest x-ray may indicate worsening of the condition, diminished breath sounds suggest impaired lung function, and ABG results with a pH of 7.48, PaO2 of 77 mm Hg, and PaCO2 of 47 mm Hg do not specifically indicate treatment effectiveness for a pulmonary embolism.

5. A nurse is teaching a newly licensed nurse about using a portable oxygen system. What instruction should the nurse include?

A. The oxygen should be kept in a storage room when not in use.
B. Turn off the oxygen when not in use.
C. Check the oxygen level regularly using a pulse oximeter.
D. Never leave the oxygen running when transporting a client.

Correct answer: C

Rationale: The correct answer is to check the oxygen level regularly using a pulse oximeter. This instruction is crucial as it ensures safe and adequate oxygenation for the client. Option A is incorrect as oxygen should not be stored in a storage room but in a well-ventilated area. Option B is not ideal as oxygen should be left on unless otherwise specified by a healthcare provider. Option D is also important but not directly related to the primary instruction of monitoring oxygen levels.