A client with a large pleural effusion undergoes a thoracentesis. Following the procedure, which observation warrants immediate intervention by the nurse? Reference Range: Arterial Blood Gas (ABG) PH [7.35 to 7.45] PaCO2 [35 to 45 mm Hg) HCO [21 to 28 mEq/L (21 to 28 mmol/L)] PaO2 [80 to 100 mm Hg]

Rationale: A. The client's arterial blood gas result is a pH 7.35, PaCO2 35 mm Hg, HCO3⁻ 26 mEq/L, PaO2 85 mm Hg: These values are within normal limits, indicating adequate oxygenation and ventilation. There is no immediate concern based on the ABG results. B. The client's chest x-ray indicates decreased pleural effusion: This finding indicates that the thoracentesis successfully removed fluid and reflects the desired outcome of the procedure. It does not warrant urgent intervention. C. The client has asymmetrical chest wall expansion: Unequal chest movement after thoracentesis may indicate complications such as pneumothorax or lung collapse. This is a potentially life-threatening condition that requires immediate assessment and intervention. D. The client reports pain at the insertion site: Mild to moderate pain at the thoracentesis site is expected and can be managed with analgesics. While it should be monitored, it is not an urgent or life-threatening finding.