Well, I'd definitely say impaired gas exchange related to accumulation of excess fluid in the pleural space.
Is the patient SOB, tachypnic, coughing, or using accessory muscles? If so, Ineffective breathing pattern related to decreased lung compliance may be an option.
Patients with impaired gas exchange are often anxious, so anxiety could be an option.
(Risk for) Activity intolerance?
Deficient knowledge?
Risk for infection (does patient have IV's. Foley Cath)?