Correct Answer: B

Rationale: The correct answer is B: 'Monitor sodium intake.' Sodium levels can affect lithium levels in the body, so it is crucial to maintain a consistent sodium intake to prevent toxicity or subtherapeutic levels. Option A is incorrect because lithium is usually recommended to be taken on an empty stomach to enhance absorption. Option C, reporting signs of weight gain, is relevant but not as critical as monitoring sodium intake. Option D, avoiding excessive caffeine intake, is important for some individuals but not as essential as monitoring sodium levels when taking lithium.

Correct Answer: A

Rationale: After reconstitution, the concentration of cefazolin solution is calculated by dividing the total amount of drug (600 mg) by the total volume after reconstitution (2.5 mL). This gives 600 mg / 2.5 mL = 240 mg/mL. However, the question asks for the concentration in each milliliter of solution after reconstitution, so we need to consider the final volume of 2.5 mL. Therefore, 240 mg/mL * 2.5 mL = 600 mg, which means each milliliter contains 240 mg of cefazolin. Therefore, after reconstitution, there are 400 mg of cefazolin in each milliliter of solution. Choices B, C, and D are incorrect as they do not accurately reflect the concentration after reconstitution.

Correct Answer: C

Rationale: The correct intervention for a client experiencing difficulty expectorating thick secretions due to pneumonia is to encourage increased fluid intake. Increasing fluid intake helps to thin secretions, making them easier to expectorate. Administering antibiotics (Choice A) is important in treating pneumonia but does not directly address the issue of thick secretions. Chest physiotherapy (Choice B) may help in some cases, but increasing fluid intake is a more straightforward and effective intervention. Providing humidified oxygen (Choice D) can help with oxygenation but does not directly address the problem of thick secretions.

Correct Answer: A

Rationale: Before an MRI scan with contrast, the nurse should assess if the client has any metal implants. Metal implants can interfere with the magnetic field of the MRI, which can pose a risk to the client's safety and compromise the quality of the scan. Assessing for allergies to iodine or shellfish (Choice B) is important for contrast agents but not specific to metal implants. Claustrophobia assessment (Choice C) is relevant for MRI scans due to the confined space but not specific to metal implants. Past procedures (Choice D) are important for comparison but not directly related to the risks associated with metal implants during an MRI scan with contrast.

Correct Answer: B

Rationale: Encouraging increased fluid intake is the appropriate intervention to assist the client with pneumonia who is having difficulty expectorating thick secretions. Adequate hydration helps to thin the secretions, making them easier to cough up. Administering antibiotics (Choice A) is important for treating the infection itself but does not directly address the thick secretions. Chest physiotherapy (Choice C) may be beneficial in some cases but is not the initial intervention for thick secretions. Providing humidified oxygen (Choice D) can help with oxygenation but does not directly address the problem of thick secretions.