Correct Answer: B

Rationale: The correct answer is B because after brain death is confirmed, maintaining perfusion and oxygenation of organs is crucial to ensure their viability for donation. This process allows organs to be retrieved in optimal condition during the operation. Choice A is incorrect because a signed donor card is not a legal mandate for organ retrieval. Choice C is incorrect as the healthcare proxy's consent is typically required for organ donation. Choice D is incorrect because life support is not immediately withdrawn upon brain death confirmation; instead, organ preservation measures are initiated.

Correct Answer: B

Rationale: The correct answer is B because an increase in heart rate and respiratory rate can be a normal response before body system functions decrease in a hospice patient. This is known as a compensatory mechanism as the body tries to maintain oxygenation. Choice A is incorrect because symptoms may not always continue to increase until death. Choice C is incorrect as it implies a reflex response, which may not be the case. Choice D is incorrect as an improvement in the patient's condition is unlikely in a hospice setting.

Correct Answer: A

Rationale: The correct answer is A: Medical futility. In this scenario, the patient's condition is terminal with no treatment options left. Continuing chemotherapy offers no benefit and may even harm the patient. Medical futility refers to interventions that are unlikely to achieve the desired outcome. B: Palliative care focuses on improving quality of life for patients with serious illnesses, which is not being addressed in this case. C: Terminal weaning involves gradually removing life-support measures, which is not happening here. D: Withdrawal of treatment would be appropriate if the treatments were no longer beneficial, but the issue here is the continued provision of futile treatment.

Correct Answer: B

Rationale: The correct answer is B: A deep vein thrombosis from lower extremities. Deep vein thrombosis (DVT) is the most common cause of a pulmonary embolus as a blood clot can dislodge from the veins, travel to the lungs, and block blood flow. An amniotic fluid embolus (Choice A) occurs during childbirth and is rare as a cause of pulmonary embolism. A fat embolus (Choice C) typically occurs after a long bone fracture and is more likely to cause issues in the lungs. Vegetation from an infected central venous catheter (Choice D) can cause septic pulmonary embolism, but it is not as common as DVT.

Correct Answer: A

Rationale: The correct answer is A: Cyclical exacerbation of one another. Pain and anxiety can intensify each other in a cyclical manner. Pain can trigger anxiety, making the pain feel worse, and anxiety can heighten pain perception. This relationship is well-documented in research and clinical practice. Choice B is incorrect because although both pain and anxiety benefit from thorough nursing assessment, it is not a factor common to both conditions. Choice C is incorrect as both pain and anxiety can be influenced by real and perceived phenomena, not solely real phenomena. Choice D is incorrect because while previous experiences can impact pain and anxiety perception, it is not a factor common to both conditions.