Correct Answer: A

Rationale: In a client with multiple system trauma, airway protection is the priority focus of care. Ensuring a patent airway is crucial for oxygenation and ventilation, which are essential for maintaining vital functions. Without a clear airway, the client's oxygenation and ventilation could be compromised, leading to severe consequences. While decreasing intracranial pressure, stabilizing cardiac arrhythmias, and preventing musculoskeletal disability are important aspects of care, ensuring airway protection takes precedence in this emergency situation.

Correct Answer: C

Rationale: In respiratory acidosis, there is an excess of carbon dioxide (PaCO2 > 45 mm Hg) leading to a decrease in pH (<7.35). The given values of a pH of 7.3 and PaCO2 of 50 mm Hg indicate respiratory acidosis. Metabolic acidosis involves a primary decrease in bicarbonate levels with a compensatory decrease in PaCO2 to maintain balance. Metabolic alkalosis is characterized by elevated pH and bicarbonate levels. Respiratory alkalosis is marked by low PaCO2 and increased pH levels.

Correct Answer: B

Rationale: Atelectasis is a condition where the alveoli in the lungs collapse, leading to impaired gas exchange. As a result, the client may experience increasing dyspnea (difficulty breathing) due to the decreased lung capacity for oxygen exchange. Facial flushing, decreasing respiratory rate, and friction rub are not typically associated with atelectasis.

Correct Answer: B

Rationale: In a client with a high respiratory rate, low PaO2, and low SaO2, the priority intervention is to improve oxygenation. Administering oxygen via a face mask will help increase the oxygen supply to the client's lungs and tissues, addressing the hypoxemia. While mechanical ventilation may be necessary in severe cases, administering oxygen is the initial and most appropriate intervention to address the client's respiratory distress. Sedatives should not be given without ensuring adequate oxygenation. Assessing for pulmonary embolism is important but not the priority at this moment when the client is experiencing respiratory distress and hypoxemia.

Correct Answer: A

Rationale: The correct answer is Propranolol. Propranolol is a beta-blocker that can potentially exacerbate asthma symptoms due to its mechanism of action. It can cause bronchoconstriction, which is harmful for a client experiencing an asthma exacerbation. Theophylline, Montelukast, and Prednisone are commonly used in the treatment of asthma exacerbations and would not typically require clarification in this context.