which lab value is critical for a patient on heparin therapy

ATI RN

ATI RN Exit Exam

1. Which lab value is critical for a patient on heparin therapy?

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

Correct answer: A

Rationale: The correct answer is to monitor aPTT. Activated Partial Thromboplastin Time (aPTT) is crucial for patients on heparin therapy as it helps determine the clotting ability of the blood. By monitoring aPTT, healthcare providers can adjust the dosage of heparin to maintain therapeutic levels and prevent bleeding complications. Monitoring INR is more commonly associated with warfarin therapy, not heparin. Monitoring platelet count is important for assessing the risk of bleeding or clotting disorders but is not specific to heparin therapy. Monitoring sodium levels is not directly related to assessing the effectiveness or safety of heparin therapy.

2. A nurse is caring for a client who has a prescription for digoxin. Which of the following laboratory values should the nurse monitor to identify an adverse effect of this medication?

A. Potassium 3.5 mEq/L
B. Sodium 140 mEq/L
C. Calcium 9.5 mg/dL
D. Magnesium 2.0 mEq/L

Correct answer: A

Rationale: The correct answer is A: Potassium 3.5 mEq/L. Digoxin can cause hypokalemia as an adverse effect. Monitoring potassium levels is crucial because low potassium levels can increase the risk of digoxin toxicity. Choices B, C, and D are incorrect as they are not directly associated with potential adverse effects of digoxin. Sodium levels are not typically affected by digoxin, calcium levels are not a primary concern with digoxin therapy, and magnesium levels are not the most important to monitor for digoxin adverse effects.

3. A client with type 2 diabetes mellitus is scheduled for an arteriogram. Which of the following medications should the nurse instruct the client to discontinue 48 hours prior to the procedure?

A. Atorvastatin
B. Digoxin
C. Nifedipine
D. Metformin

Correct answer: D

Rationale: The correct answer is D, Metformin. Metformin should be discontinued 48 hours before an arteriogram due to the risk of lactic acidosis. Atorvastatin (Choice A) is a statin used to lower cholesterol levels and is not typically contraindicated before an arteriogram. Digoxin (Choice B) is a medication used for heart conditions and does not need to be discontinued before an arteriogram. Nifedipine (Choice C) is a calcium channel blocker used to treat high blood pressure and angina, and it is not necessary to discontinue before the procedure.

4. Which lab value should be monitored in patients receiving furosemide?

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

Correct answer: A

Rationale: The correct answer is to monitor potassium levels in patients receiving furosemide. Furosemide is a loop diuretic that can lead to potassium loss in the urine, potentially causing hypokalemia. Monitoring potassium levels is crucial to prevent complications associated with low potassium levels, such as cardiac arrhythmias. Monitoring sodium levels (choice B) is not typically necessary with furosemide use, as it primarily affects potassium levels. Calcium levels (choice C) and glucose levels (choice D) are not directly impacted by furosemide and require monitoring for other conditions or medications.

5. A client post-thyroidectomy reports tingling in their lips and fingers. The nurse should identify this finding as an indication of which of the following complications?

A. Hypokalemia
B. Hypocalcemia
C. Hyponatremia
D. Hyperglycemia

Correct answer: B

Rationale: Tingling in the lips and fingers is a classic sign of hypocalcemia, which can occur as a complication following a thyroidectomy due to inadvertent damage to the parathyroid glands that regulate calcium levels. Hypokalemia (Choice A) presents with muscle weakness and cardiac issues, not tingling. Hyponatremia (Choice C) typically manifests with confusion, seizures, and muscle cramps. Hyperglycemia (Choice D) is associated with increased thirst, frequent urination, and fatigue.