Correct Answer: A

Rationale: The stroke volume is calculated by dividing the cardiac output by the heart rate. Given the cardiac output of 4.7 L/min and a heart rate of 87 bpm, the stroke volume is 54 mL (4700 mL/87 bpm ≈ 54 mL). Therefore, choice A (54) is the correct answer. Choices B, C, and D are incorrect as they do not match the calculated stroke volume based on the provided cardiac output and heart rate.

Correct Answer: A

Rationale: The correct answer is A: fluid retention of 1.5 liters. The weight gain from 97.5 kg to 99 kg indicates an increase in fluid retention. This difference of 1.5 kg corresponds to fluid retention of 1.5 liters, as 1 liter of water weighs approximately 1 kg. This weight gain suggests that the patient is retaining more fluid than they are excreting, leading to an increase in weight. Incorrect choices: B: fluid loss of 1.5 liters - This is incorrect because the weight increased, indicating fluid retention. C: equal intake and output due to insensible losses - This is incorrect as weight increased, showing an imbalance in intake and output. D: fluid loss of 0.5 liters - This is incorrect as the weight increased, indicating fluid retention, not loss.

Correct Answer: B

Rationale: The correct answer is B: Partly compensated respiratory acidosis, normal oxygen. The pH of 7.31 indicates acidosis, the PaCO2 of 48 mm Hg shows respiratory acidosis, and the bicarbonate level of 22 mEq/L is slightly elevated, indicating the kidneys are compensating. The PaO2 of 115 mm Hg and oxygen saturation of 99% are normal, ruling out hypoxemia. Therefore, the patient is experiencing partly compensated respiratory acidosis. A: Normal arterial blood gas levels with a high oxygen level - Incorrect. The pH is low, indicating acidosis, which is not normal. C: Uncompensated metabolic acidosis with high oxygen level - Incorrect. Metabolic acidosis would have a primary issue with bicarbonate levels, which is not the case here. D: Uncompensated respiratory acidosis; hyperoxygenated - Incorrect. The oxygen levels are normal, ruling out hyperoxygenation.

Correct Answer: C

Rationale: The correct answer is C because the SUPPORT study revealed disparities between patients' care preferences and the actual care provided. This is supported by the findings that many patients did not receive treatments aligned with their preferences. Choice A is incorrect because the study actually highlighted communication challenges between patients and healthcare providers. Choice B is incorrect as the study showed that critical care units often do not meet the needs of dying patients and their families. Choice D is incorrect as the study found that pain and suffering of patients at the end of life are not always well controlled in hospitals.

Correct Answer: A

Rationale: Step-by-step rationale: 1. Bladder catheterization helps relieve urinary obstruction, a common postrenal cause of acute kidney injury. 2. By draining urine from the bladder, it prevents further damage to the kidneys. 3. This intervention addresses the underlying cause of the kidney injury, leading to improvement. Summary: - Choice A is correct as it directly addresses the postrenal cause by relieving urinary obstruction. - Choices B, C, and D are incorrect as they do not target the specific postrenal cause of acute kidney injury.