A client admitted to the emergency department with bacterial pneumonia has ABGs showing pH 7.25, PCO2 68 mmHg, and HCO3 24 mEq/L. The client is started on antibiotics and oxygen therapy. Which nursing intervention should be prioritized to address this client's acid-base imbalance and respiratory status?

Choice A rationale Monitoring vital signs is a fundamental nursing action but does not actively correct the physiological cause of the acid base imbalance. While it provides data on the severity of the respiratory distress, it is a passive observation rather than a therapeutic intervention. In this scenario, the client exhibits respiratory acidosis with a pH of 7.25 and a high PCO2 of 68 mmHg, indicating significant carbon dioxide retention and inadequate ventilation. Choice B rationale Administering sodium bicarbonate is generally reserved for severe metabolic acidosis rather than respiratory acidosis. In cases where the primary problem is hypoventilation, adding bicarbonate can actually worsen the situation by increasing the production of carbon dioxide as the bicarbonate reacts with hydrogen ions. The standard treatment for respiratory acidosis involves improving pulmonary ventilation to facilitate the removal of excess CO2. Normal serum bicarbonate levels are typically between 22 and 28 mEq/L. Choice C rationale Monitoring cardiac rhythm is important because acidosis and hypercapnia can lead to cardiac dysrhythmias, but it remains a secondary action to improving the airway. High PCO2 levels of 68 mmHg, which is significantly above the normal 35 to 45 mmHg range, cause cellular changes that affect myocardial conductivity. While assessment of the rhythm is necessary for safety, it does not provide the primary mechanical solution needed to lower the PCO2 levels. Choice D rationale Encouraging coughing and deep breathing is the priority because it directly facilitates the clearance of secretions and enhances alveolar ventilation to reduce PCO2. By improving gas exchange, the nurse helps the patient blow off excess carbon dioxide, which is the root cause of the pH dropping below the normal 7.35 to 7.45 range. This mechanical intervention addresses the primary physiological defect seen in pneumonia related respiratory acidosis by opening collapsed alveoli.