Correct Answer: B

Rationale: The correct answer is B: Platelet count 50,000/mm³. A platelet count of 50,000/mm³ increases the risk of bleeding, making heparin contraindicated. Platelets are essential for blood clotting, and a low count can lead to excessive bleeding. Choices A, C, and D are not contraindications to heparin administration. Hemoglobin level of 13 g/dL is within the normal range, white blood cell count of 6,000/mm³ is also normal, and an INR of 2.5 is within the therapeutic range for patients receiving heparin therapy.

Correct Answer: B

Rationale: The correct statement the nurse should include in the teaching for a client with a new prescription for furosemide is that the client should take the medication with food to prevent gastrointestinal upset. Furosemide is a loop diuretic that can cause gastrointestinal upset, so taking it with food can help reduce this side effect and improve medication tolerance. Choices A, C, and D are incorrect because furosemide does not increase potassium levels, decrease blood glucose levels, or require an increase in the intake of potassium-rich foods. Therefore, the most important teaching point for the client is to take furosemide with food.

Correct Answer: B

Rationale: The correct action the nurse should take when administering enoxaparin is to inject the medication deep into subcutaneous tissue. This method helps ensure proper absorption of the medication and prevents tissue irritation. Injecting into the deltoid muscle (Choice A) is not recommended for enoxaparin administration. Massaging the injection site (Choice C) can lead to tissue damage and bruising. Inserting the needle at a 10-degree angle (Choice D) is not the correct technique for administering enoxaparin.

Correct Answer: C

Rationale: The correct answer is C. A heart rate of 110/min is elevated and may indicate hypocalcemia, a potential complication following a thyroidectomy. Elevated heart rate can be a sign of hypocalcemia due to the close relationship between calcium levels and cardiac function. Option A, serum calcium level of 8 mg/dL, is within the normal range (8.5-10.5 mg/dL) and would not be a cause for concern post-thyroidectomy. Option B, urine output of 60 mL/hr, is within the normal range for urine output and not typically a priority finding post-thyroidectomy. Option D, a temperature of 37.5°C (99.5°F), is slightly elevated but not a critical finding post-thyroidectomy unless accompanied by other symptoms.

Correct Answer: D

Rationale: The correct answer is D. A low potassium level (3.1 mEq/L) can increase the risk of digoxin toxicity. Hypokalemia can potentiate the effects of digoxin on the heart, leading to serious dysrhythmias. Choices A, B, and C are within normal ranges and do not indicate a need to withhold digoxin.