Critical Care Nursing Exam Questions

Correct Answer: B

Rationale: The correct answer is B: Oxygen that is chemically combined with hemoglobin. This is because oxygen primarily travels in the blood by binding to hemoglobin in red blood cells, forming oxyhemoglobin. This process allows for efficient transport of oxygen to tissues throughout the body. Choices A, C, and D are incorrect because: A: Alveolar oxygen tension refers to the partial pressure of oxygen in the alveoli of the lungs, not the specific form of oxygen in the blood. C: Oxygen physically dissolved in plasma refers to the small amount of oxygen that is not bound to hemoglobin and is less significant in oxygen transport compared to oxygen bound to hemoglobin. D: Total oxygen consumption is the overall amount of oxygen utilized by the body, not specifically the form of oxygen bound to hemoglobin for transport.

Correct Answer: D

Rationale: Step 1: The correct answer is D because the situation involves a patient with multiple trauma who is not responding to treatment and has no known family members. This indicates a complex ethical dilemma where the medical team may be unsure about the appropriate course of action. Step 2: In this scenario, an ethics consultation is necessary to help guide decision-making regarding the care of the patient. The lack of available family members complicates decision-making, and the consideration of care as futile adds another layer of complexity. Step 3: An ethics consultation can provide a structured framework for evaluating the situation, considering ethical principles such as beneficence, non-maleficence, autonomy, and justice. It can help the healthcare team navigate the ethical considerations and make a well-informed decision in the best interest of the patient. Summary: Choice A: While conflicts between the primary care provider and family may warrant discussions, the agreement on a treatment plan does not necessarily require an ethics consultation. Choice B: Disagreement

Correct Answer: B

Rationale: The correct answer is B because anxiety is indeed linked to reward and punishment centers in the limbic system, specifically involving the amygdala and prefrontal cortex. This connection influences emotional responses and behaviors related to anxiety. Choices A, C, and D are incorrect because anxiety involves both neurological and psychological processes beyond the brain, is highly subjective like pain, and can lead to physical symptoms without actual tissue injury.

Correct Answer: E

Rationale: The correct answer is not provided, but based on the events described, the official time of death recorded in the medical record should be 1810 (Choice D). At this time, the cardiac monitor shows flatline, indicating the cessation of cardiac activity, which is the universally accepted point of declaring death. Choice A (1300) is incorrect because that is when diagnostic tests for brain death were completed, but the patient was not officially declared dead at that time. Choice B (1330) is incorrect as this is when the primary care provider reviewed the test results and documented brain death in the progress note, but the patient was not officially declared dead at this time either. Choice C (1400) is incorrect as there is no significant event occurring at this time that signifies the patient's death. Therefore, the most appropriate and official time of death recorded in the medical record would be 1810 when the cardiac monitor shows flatline.

Correct Answer: A

Rationale: The correct answer is A: "Do not resuscitate." In this scenario, the patient's advance directive specifies a desire for comfort measures and continuation of food and fluids. A DNR order aligns with this directive by respecting the patient's wish to avoid aggressive life-saving measures. This choice prioritizes the patient's autonomy and quality of life. Other options (B, C, D) are not aligned with the patient's wishes. Changing antibiotics or stopping blood transfusions may be unrelated to the patient's comfort or food/fluid preferences. Discontinuing tube feeding goes against the directive's request for food and fluid continuation.