Correct Answer: C

Rationale: The correct answer is C. Low back pain during a blood transfusion is a classic sign of a transfusion reaction, specifically a transfusion-associated circulatory overload (TACO) or hemolytic reaction, both of which require immediate attention to prevent serious complications. Assessing this client first is crucial to ensure prompt intervention. Choices A, B, and D do not indicate immediate life-threatening complications and can be addressed after the client experiencing low back pain during a blood transfusion is stabilized.

Correct Answer: A

Rationale: Placing a daily calendar in the kitchen is beneficial for clients with Alzheimer's disease as it helps in orienting them to time and enhances cognitive function. This visual aid can assist in keeping track of days and activities. Choice B, replacing buttoned clothing with zippered items, is more related to promoting independence in dressing rather than directly supporting cognitive function. Choice C, replacing carpet with hardwood floors, focuses on safety and mobility rather than cognitive function. Choice D, creating variation in the daily routine, may be helpful for engagement and stimulation but does not directly address cognitive function as effectively as using a daily calendar.

Correct Answer: B

Rationale: Monitoring oxygen saturation levels is the most important intervention in this scenario. It ensures that the client is receiving adequate oxygenation, which is crucial for a client with pneumonia. By monitoring saturation levels, the nurse can promptly identify any oxygenation issues and adjust the oxygen delivery if necessary. Encouraging fluid intake, changing oxygen tubing daily, and assisting with frequent position changes are also important aspects of care for a client with pneumonia, but they are not as critical as monitoring oxygen saturation levels in ensuring immediate respiratory support.

Correct Answer: C

Rationale: When contractions occur every 45 seconds with a high fetal heart rate, it indicates uterine hyperstimulation and fetal distress. In this situation, the oxytocin infusion should be discontinued immediately to prevent further complications. Increasing or maintaining the infusion would worsen the hyperstimulation and distress. Decreasing the infusion may not be sufficient to address the current situation and could still lead to complications.

Correct Answer: B

Rationale: The correct answer is to inject enoxaparin in the lateral abdominal wall. This site is typically recommended for subcutaneous injections of this medication. Expelling air bubbles from prefilled syringes is not necessary and may result in medication loss. Massaging the injection site is contraindicated as it can cause bruising or hematoma formation. Administering NSAIDs for injection site discomfort is unnecessary and not a standard practice.