Correct Answer: A

Rationale: To evaluate the effectiveness of therapies for cor pulmonale and right-sided heart failure, observing for distended neck veins would be the most appropriate assessment. Cor pulmonale is characterized by right ventricular failure due to pulmonary hypertension, leading to clinical manifestations such as peripheral edema, jugular venous distention, and right upper-quadrant abdominal tenderness. These signs indicate increased central venous pressure and right heart strain, which can be assessed by observing for distended neck veins. Auscultating for crackles in the lungs is more indicative of left-sided heart failure rather than right-sided heart failure. Heaves or thrills over the heart are not typically associated with cor pulmonale. Reviewing hemoglobin and hematocrit values may show elevations due to chronic hypoxemia and polycythemia in cor pulmonale, but these values alone do not directly evaluate the immediate effectiveness of the prescribed therapies on the patient's condition.

Correct Answer: D

Rationale: While all the values are abnormal, the low PaO2 level of 59 mm Hg indicates that the patient is at a critical point on the oxyhemoglobin dissociation curve. At this level, a small decrease in PaO2 can lead to a significant drop in oxygen saturation and compromise tissue oxygenation. Therefore, immediate intervention is necessary to improve the patient's oxygenation status. Choice A (HCO3 of 31 mEq/L) may indicate metabolic alkalosis or compensation for respiratory acidosis; however, it does not require immediate action in this scenario. Choice B (SaO2 of 92%) is slightly low but not critically low to require immediate action. Choice C (PaCO2 of 31 mm Hg) is within the normal range and does not indicate immediate danger to the patient.

Correct Answer: B

Rationale: The nurse's initial response should be to collect more assessment data about the patient's statement. The answer beginning 'Can you tell me what it is' is the most open-ended question and will offer the best opportunity for obtaining more data. The answer beginning 'Are you afraid' implies that the patient thinks that the cancer will be immediately fatal, although the patient's statement may not be related to the cancer diagnosis. The remaining two answers offer interventions that may be helpful to the patient, but more assessment is needed to determine whether these interventions are appropriate.

Correct Answer: S

Rationale: In this scenario, the best action is to set up the patient-controlled analgesia (PCA) and administer the loading dose of morphine. The patient's pain level is high, which can hinder deep breathing and coughing. Addressing pain control is a priority to facilitate optimal respiratory function. Milking the chest tube to remove clots is unnecessary as the drainage amount is not alarming in the early postoperative period. Clamping the chest tube to locate the air leak is not recommended as it can lead to tension pneumothorax. Assisting the patient to deep breathe, cough, and use the incentive spirometer is important but should follow adequate pain management to ensure the patient can effectively participate in these activities.

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.