Correct Answer: D

Rationale: Placing a pillow under the client's lower legs is the correct intervention because it helps prevent pressure on the incision site and promotes circulation. Elevating the lower legs also aids in reducing swelling and improving blood flow. Applying heat to the incision site (Choice A) is contraindicated in the early postoperative period as it can increase inflammation and the risk of infection. Keeping the client's knee flexed while in bed (Choice B) may lead to contractures or limited extension of the knee joint. Placing a pillow under the client's knee (Choice C) may cause hyperextension of the knee, which is also not recommended post knee arthroplasty.

Correct Answer: C

Rationale: The correct answer is C: 'Use a mechanical lift to move a client.' Using a mechanical lift is an essential ergonomic principle to prevent injury and ensure safe client handling. Choice A is incorrect because standing with feet together when lifting a client can lead to instability and improper weight distribution. Choice B is incorrect as raising the client's head of bed before pulling the client up does not primarily relate to ergonomic principles. Choice D is incorrect because while using a gait belt is important for assisting clients with mobility, it is not specifically related to ergonomic principles for safe handling.

Correct Answer: C

Rationale: The correct answer is C: Provide the client with a stool softener. Thrombocytopenia is a condition characterized by a low platelet count, which can lead to an increased risk of bleeding. Providing the client with a stool softener is essential to prevent straining during bowel movements, which could result in bleeding for clients with thrombocytopenia. Encouraging the client to floss daily (choice A) is unrelated to the management of thrombocytopenia. Removing fresh flowers (choice B) is more relevant for clients with a compromised immune system. Avoiding serving raw vegetables (choice D) is important for clients with compromised immune systems to prevent foodborne illnesses, but it is not directly related to thrombocytopenia.

Correct Answer: B

Rationale: The correct answer is B because avoiding cleaning the cat's litter box during pregnancy reduces the risk of toxoplasmosis, which can be harmful to the developing fetus. Choice A is incorrect because visiting someone with chickenpox should be avoided as it is highly contagious. Choice C is incorrect as handwashing after gardening should involve soap and water, not just hot water, for effective infection prevention. Choice D is incorrect because antibiotics are ineffective against viral infections.

Correct Answer: C

Rationale: In this scenario, with a fetal heart rate (FHR) baseline of 100/min for 15 minutes, the nurse should suspect maternal hypoglycemia. Maternal hypoglycemia can result in fetal bradycardia, which is defined as an FHR less than 110 beats per minute. Maternal hypoglycemia requires prompt intervention to prevent adverse outcomes for both the mother and the fetus. Maternal fever (Choice A) typically presents with tachycardia rather than bradycardia in the fetus. Fetal anemia (Choice B) is more likely to present with other signs such as pallor or tachycardia rather than bradycardia. Chorioamnionitis (Choice D) is characterized by maternal fever, uterine tenderness, and foul-smelling amniotic fluid, but it is not directly linked to the FHR baseline being 100/min.