A 65-year-old female patient is being treated for pneumonia and has a history of hypertension, diabetes mellitus, and chronic obstructive pulmonary disease (COPD). Following the initiation of intravenous antibiotics, she begins to demonstrate a high fever, productive cough with green sputum, and increased respiratory distress. The healthcare team is evaluating her condition for potential complications.
Which potential complication related to her condition and treatment should the nurse closely monitor for in this patient?