Correct Answer: D

Rationale: Bilateral crackles at lung bases indicate a potential acute issue like heart failure. Immediate action is necessary in this situation. The nurse should conduct further assessments such as oxygen saturation and inform the healthcare provider promptly. A barrel-shaped chest and hyperresonance to percussion are typical signs of aging and do not require immediate action. A weak cough effort is common in older patients due to age-related changes, and dry mucous membranes are also expected in older individuals. While these findings may warrant further evaluation, they do not demand immediate action like bilateral crackles at lung bases.

Correct Answer: C

Rationale: After a pneumonectomy, frequent deep breathing and coughing are essential to prevent atelectasis and promote gas exchange. Patients are typically positioned on the surgical side to aid in gas exchange. Early mobilization is crucial to reduce the risk of postoperative complications such as pneumonia and deep vein thrombosis. While chest tubes may or may not be placed in the surgical space, if used, they are clamped and only adjusted by the surgeon to manage serosanguineous fluid accumulation. Overfilling of the chest cavity can compromise remaining lung function and cardiovascular status. Chest x-rays are useful for monitoring fluid volume and space postoperatively. Therefore, the correct postoperative care instruction for the patient undergoing a left pneumonectomy is the frequent use of an incentive spirometer. Choices A, B, and D are incorrect as positioning on the right side, bed rest for the first 24 hours, and continuous chest tube drainage are not standard postoperative care practices for patients undergoing pneumonectomy.

Correct Answer: C

Rationale: Infectious mononucleosis is a viral disease caused by the Epstein-Barr virus. The symptoms of sore throat, fever, chills, swollen lymph nodes, and extreme fatigue are characteristic of infectious mononucleosis. The diagnosis is confirmed through the client's history and blood tests for the Epstein-Barr virus. Methicillin-resistant Staphylococcus aureus (MRSA) presents with localized skin infections, not the systemic symptoms described. Hepatitis B typically presents with jaundice, abdominal pain, and liver inflammation, not the symptoms described. Norovirus infection commonly causes gastrointestinal symptoms like vomiting and diarrhea, not the symptoms presented by the client.

Correct Answer: B

Rationale: The nurse should be most concerned if 400 mL of blood is observed in the collection chamber as it may indicate the patient is at risk of developing hypovolemic shock. A large air leak in the water-seal chamber is expected initially after chest tube placement for a pneumothorax. While pain with deep inspiration should be treated, it is not as urgent as the risk of continued hemorrhage. Subcutaneous emphysema is not uncommon in a patient with pneumothorax and is usually harmless. However, a large amount of blood in the collection chamber is a more critical finding that requires immediate attention to prevent potential complications.

Correct Answer: D

Rationale: Directly observed therapy is the most effective means for ensuring compliance with the treatment regimen for a homeless patient with active tuberculosis. By arranging a daily noon meal at a community center where the drug will be administered, the nurse ensures that the patient is available to receive the medication and can directly observe the patient taking it. This method helps address the challenges faced by homeless individuals, such as lack of a stable living situation. The other options, such as having a friend administer the medication, giving written instructions, or educating about infecting others, may not be as effective in ensuring adherence, especially in the case of a homeless individual with alcoholism.