Correct Answer: A

Rationale: The correct answer is A because postrenal acute kidney injury is caused by obstruction of urine flow, leading to pressure build-up in the kidneys and subsequent damage. Obstructions can be due to conditions such as kidney stones, tumors, or enlarged prostate. Choices B, C, and D are incorrect as they relate to pre-renal and intrinsic renal causes of acute kidney injury, not specifically postrenal obstruction. B refers to decreased blood flow to the kidneys, C to low volume or poor heart function affecting kidney perfusion, and D to direct damage to kidney tissue, which do not characterize postrenal etiology.

Correct Answer: D

Rationale: The correct answer is D because it involves a conflict between the patient's autonomy and her son's beliefs. The patient, a Jehovah's Witness, has clearly stated her refusal of a blood transfusion in her advance directive, which aligns with her religious beliefs. Her son's disagreement with her decision creates a significant ethical dilemma and conflict. This scenario highlights the clash between respecting the patient's autonomy and the son's concerns for her well-being. Choice A is less likely to result in the greatest conflict as both parents have similar values and are amicable, with the conflict being directed towards the daughter's boyfriend. Choice B involves a conflict between the patient's girlfriend and parents, but the patient's lack of advance directives and estranged relationship with his parents do not present as significant a conflict as in the correct answer. Choice C involves a designated healthcare proxy and a committed relationship, which are less likely to result in a conflict as compared to the clash of beliefs and autonomy seen in Choice D.

Correct Answer: C

Rationale: The correct answer is C because it involves patient-centered care and respects the family's preferences. By asking the family members whether they would prefer to remain in the patient's room or wait outside, the nurse acknowledges their needs and allows them to make an informed decision based on their comfort level. This empowers the family members and promotes a supportive environment during a stressful situation. Choice A is incorrect because it assumes that keeping the family in the room without their input is the best approach, which may not be the case for all families. Choice B is incorrect because asking the family to wait outside without considering their preferences may not be the most supportive action. Choice D is incorrect because it makes a blanket statement about patient comfort without considering individual family dynamics and preferences.

Correct Answer: A

Rationale: The correct answer is A: Verbally coach the patient to breathe with the ventilator. This approach allows the nurse to address the patient's anxiety and help them synchronize their breathing with the ventilator, promoting better ventilation and oxygenation. It is important to first try non-invasive interventions before resorting to sedation or manual ventilation. Sedating the patient (B) should be a last resort to avoid potential complications. Manual ventilation (C) may disrupt the ventilator settings and cause respiratory distress. Increasing the rate of propofol infusion (D) is not indicated unless the patient's sedation level is inadequate.

Correct Answer: A

Rationale: The correct answer is A because this patient had a complex surgery with complications, requiring long-term care and loss of a significant other, which can impact their emotional well-being and support system. This can lead to decreased functional status and quality of life. Choice B is incorrect as the patient has support from a spouse and manages health care independently, indicating a good support system. Choice C is incorrect as the patient is cognitively intact and social, which suggests a good quality of life. Choice D is incorrect as the patient had a less complex procedure, well-managed diabetes, and was living independently, which indicates a lower risk for decreased functional status and quality of life compared to choice A.