Correct Answer: C

Rationale: The correct answer is C: 'Lowered immune system function.' As individuals age, their immune system tends to weaken, making them more susceptible to infections.

Choices A, B, and D are incorrect because improved circulation and increased immune function would typically reduce the risk of infections, while dehydration can impact overall health but is not directly related to immune system function in the context of infection risk.

Correct Answer: A

Rationale: Increased thirst is a classic symptom of hyperglycemia due to the body trying to eliminate excess glucose through urine, leading to dehydration and increased thirst. Weight gain, decreased urination, and fatigue are not typical signs of hyperglycemia. Weight gain is more commonly associated with conditions like hypothyroidism or fluid retention. Decreased urination is not a typical symptom of hyperglycemia, as high blood sugar levels usually lead to increased urination. Fatigue can be a symptom of hyperglycemia, but it is not as specific or characteristic as increased thirst.

Correct Answer: C

Rationale: The correct adverse effect associated with vancomycin therapy is an infusion reaction, known as Red Man Syndrome. This reaction presents with rashes, flushing, tachycardia, and hypotension. It is essential to administer vancomycin over at least 60 minutes to prevent these symptoms. Hepatotoxicity, constipation, and immunosuppression are not commonly associated with vancomycin use. Ototoxicity and renal toxicity are significant risks with prolonged vancomycin therapy.

Correct Answer: B

Rationale: Correct! When assessing a client for signs of an allergic reaction, a nurse should look for a rash. A rash is a common manifestation of an allergic response, such as contact dermatitis or hives. It is important to recognize and assess rashes promptly as they can indicate an allergic reaction.\nOption A, fever, is not typically a primary sign of an allergic reaction but may occur in severe cases. Option C, fatigue, is a general symptom and not specific to allergic reactions. Option D, increased appetite, is not a common sign of an allergic reaction and is more likely related to other conditions or factors.

Correct Answer: C

Rationale: The correct answer is C. Omeprazole is a proton pump inhibitor that can mask symptoms of gastrointestinal bleeding; clients should be monitored for this.

Choices A and B are incorrect because omeprazole is usually taken before meals, and while it is important to avoid NSAIDs if possible due to their effects on the stomach, it is not directly related to omeprazole use.
Choice D is also incorrect as omeprazole is not typically associated with causing drowsiness.