Correct Answer: D

Rationale: The correct answer is D: Hypomagnesemia. Dehydration can lead to electrolyte imbalances, and hypomagnesemia can cause confusion in elderly patients. Magnesium plays a crucial role in brain function and its deficiency can result in cognitive impairment. Hyponatremia (A) typically presents with symptoms like weakness and confusion but not necessarily dehydration. Hypercalcemia (B) and hyperkalemia (C) are less likely to cause confusion in this scenario. Therefore, hypomagnesemia is the most likely electrolyte imbalance involved in the elderly nursing home resident's confusion.

Correct Answer: D

Rationale: The correct answer is D because drawing up clear insulin first when mixing two types of insulin in one syringe prevents contamination. Clear insulin is drawn up first to avoid clouding from the cloudy insulin. This ensures accurate dosing and prevents potential medication errors. A: Incorrect. Administering insulin after the first meal may lead to hypoglycemia if the client skips or delays meals. B: Incorrect. Insulin should not be injected into the deltoid muscle as it can lead to inconsistent absorption rates. C: Incorrect. Vigorously shaking the insulin vial can cause bubbles, affecting the accuracy of the dose and potentially altering its effectiveness.

Correct Answer: B

Rationale: The correct answer is B because a Snellen chart reading of 20/80 means the patient can see at 20 feet what a normal eye can see at 80 feet. This indicates that the patient's vision is below average. Choice A is incorrect because it reverses the numerator and denominator. Choice C is incorrect because it does not accurately represent the Snellen chart findings. Choice D is incorrect because 20/80 is not considered normal vision.

Correct Answer: B

Rationale: The correct answer is B, Altered level of consciousness, because it is a critical assessment in determining Mr. Reyes's neurological status and overall well-being. Assessing for altered level of consciousness helps identify potential neurological issues, such as brain injury or stroke, which require immediate intervention. A: Decreased carotid pulses - This is related to cardiovascular assessment, not specific to Mr. Reyes's neurological status. C: Bleeding from oral cavity - While important to assess for, it is not directly related to Mr. Reyes's neurological status. D: Absence of deep tendon-reflexes - This is a specific neurological assessment, but altered level of consciousness takes priority in this scenario.

Correct Answer: B

Rationale: The correct answer is B because the client remains radioactive for a period of time after the implant removal, typically around 10 days. During this time, the nurse should take precautions to limit exposure to radiation. Choice A is incorrect because bodily fluids are not highly radioactive, and proper disposal procedures should be followed. Choice C is incorrect as soiled linens should be handled appropriately to prevent contamination. Choice D is incorrect as bed rest may not be necessary, and mobility should be encouraged within safety guidelines.