A client with a large pleural effusion undergoes a thoracentesis. Following the procedure, which observation warrants immediate intervention by the nurse?

D The client reports pain at the insertion site. B The client's arterial blood gas result is a pH 7.35, PaCO, 35 mm Hg, HCO,-26 mEq (26 mmol/L), PaO, 85 mm Hg. C The client has asymmetrical chest wall expansion. A The client's chest x-ray Indicates decreased pleural effusion.