Correct Answer: D

Rationale: The correct answer is D because using two pillows to raise the head can increase the risk of venous stasis and thrombosis in a client with polycythemia vera. This condition involves an increased production of red blood cells, leading to thicker blood and potential clot formation. Elevating the head too much can impede blood flow, exacerbating the risk of clotting. Choices A, B, and C are all appropriate statements indicating good self-care practices and physical activity, which are beneficial for clients with polycythemia vera to improve circulation and overall health.

Correct Answer: B

Rationale: The correct answer is B: Apply insect repellent to clothing and exposed skin. This advice helps prevent insect bites, reducing the risk of recurrence. Insect repellent creates a barrier against insects, hence minimizing the chances of getting bitten. Other choices are incorrect as they do not directly address the prevention of insect bites. Choice A is vague and does not provide a specific preventive measure. Choice C is incorrect as thick woollen clothing may not necessarily prevent insect bites. Choice D, sunscreen lotion, protects against UV rays, not insect bites.

Correct Answer: C

Rationale: The hallmark of nephritic syndrome is edema due to proteinuria leading to hypoalbuminemia. Protein loss in urine causes decreased colloid osmotic pressure, leading to fluid leaking into tissues, causing edema. Osmotic diuresis (A) is unrelated to nephritic syndrome. Hypolipidemia (B) and hyperproteinemia (D) are not characteristic of nephritic syndrome.

Correct Answer: C

Rationale: The nurse would identify platelets at 115,000/ul as an abnormal finding because it is below the normal range of 150,000-450,000/ul. Low platelet count can lead to increased bleeding risk. RBC count and hematocrit levels are within normal ranges, making them normal findings. Option D is incorrect as platelets are abnormal.

Correct Answer: B

Rationale: The correct answer is B because emphysema is characterized by the destruction of the alveoli walls, leading to a loss of elasticity in the lungs. This results in air becoming trapped in the lungs, making it difficult to exhale properly. Explanation for why the other choices are incorrect: A: Inflamed bronchioles causing secretions describe bronchitis, not emphysema. C: Damage to the blood supply isn't a primary feature of emphysema; it's more about lung tissue destruction. D: Large dilated sacs of sputum in the lungs is not an accurate description of emphysema; it's more related to bronchiectasis.