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] PaCO, [35 to 45 mm Hg] HCO 21 to 28 mEq/L (21 to 28 mmol/L)] PaO2 [80 to 100 mm Hg]

A. A decreased pleural effusion on a chest x-ray is generally a positive outcome following a thoracentesis. It indicates that the procedure was successful in removing the excess fluid. This finding does not warrant immediate intervention and is expected after the procedure. B. The pH of 7.35 indicates acidosis (normal range is 7.35 to 7.45). The PaCO₂ is on the lower end of normal, suggesting that if there is an acid-base imbalance, it might be metabolic or mixed. The HCO₃⁻ is within normal limits, indicating no metabolic component. The PaO₂ is slightly below the normal range (80-100 mm Hg), which could be a concern but is not critically low. C. Asymmetrical chest wall expansion can indicate a complication such as pneumothorax (air in the pleural space), which could occur as a complication of thoracentesis. This finding warrants immediate intervention because it may signify a serious issue that requires prompt attention, such as the need for a chest tube or further evaluation. D. Pain at the insertion site is expected following a thoracentesis and is generally not an urgent concern unless it is severe or associated with other symptoms like fever, difficulty breathing, or signs of infection. This type of pain is usually managed with analgesics and does not typically require immediate intervention unless accompanied by more serious symptoms.