Correct Answer: B

Rationale: The correct answer is B: Absence of a bruit. In a client with an arteriovenous fistula, the presence of a bruit (a humming sound) is an expected finding due to the high-pressure flow of blood through the fistula. Therefore, the absence of a bruit suggests a complication, such as thrombosis or stenosis, which should be reported for further evaluation and management. Choices A, C, and D are incorrect because a thrill upon palpation, distended blood vessels, and a swishing sound upon auscultation are expected findings in a client with an arteriovenous fistula and do not necessarily indicate a complication.

Correct Answer: C

Rationale: The correct answer is C. The charge nurse should include information that the proxy can make treatment decisions if the client is under anesthesia. This is a key function of a durable power of attorney for health care. Choices A, B, and D are incorrect because a health care proxy's role is specifically related to making health care decisions, not financial decisions, legal issues, or decisions made under anesthesia.

Correct Answer: B

Rationale: The correct answer is to place the client in a high Fowler's position during enteral feedings. This position helps prevent aspiration by promoting the downward flow of the feeding and reducing the risk of regurgitation into the lungs. Choice A is incorrect because flushing the NG tube with 0.9% sodium chloride before feedings is not directly related to preventing aspiration. Choice C is incorrect because the rate of administration does not directly impact the risk of aspiration. Choice D is incorrect because warming the formula does not specifically address the prevention of aspiration during enteral feedings.

Correct Answer: B

Rationale: The correct instruction the nurse should include is to 'Wear cotton socks to keep your feet dry.' This is essential in diabetes mellitus as moisture can lead to infections. Choice A is incorrect as soaking feet in warm water can actually cause dryness and skin breakdown, which is harmful in diabetes. Choice C is incorrect as applying lotion between the toes can create excess moisture, increasing the risk of fungal infections. Choice D is incorrect as cutting toenails in a rounded shape can lead to ingrown toenails; clients with diabetes should cut their nails straight across to prevent complications.

Correct Answer: B

Rationale: Correct Answer: The healthcare professional should review serum creatinine levels before administering metformin to assess kidney function. Metformin is excreted by the kidneys, and checking serum creatinine helps prevent lactic acidosis, a potential side effect in individuals with impaired renal function. Choice A: Potassium levels are not directly related to the administration of metformin. While monitoring potassium levels is important for some medications, it is not the priority when initiating metformin. Choice C: Sodium levels are not typically assessed specifically before starting metformin. It is not a routine lab test required prior to metformin administration. Choice D: Hemoglobin A1C reflects long-term blood sugar control and is not a lab test that needs to be reviewed before initiating metformin. It is used to monitor diabetes management over time, not for immediate medication administration considerations.