Review Question - QID 109066

A 78-year-old male presents to the emergency department after passing out. His wife reports that she and the patient were walking their dog when he suddenly lost consciousness. On physical exam, he has a loud crescendo-decrescendo systolic murmur and is subsequently diagnosed with severe aortic stenosis. The patient undergoes open aortic valve replacement and has an uncomplicated postoperative course. His sternal wound drain is pulled for low output on postoperative day three. On postoperative day five, the patient complains of pain during deep inspiration and retrosternal chest pain. His temperature is 101.7°F (38.7°C), blood pressure is 125/81 mmHg, pulse is 104/min, and respirations are 18/min. On physical exam, the patient is tender to palpation around his sternal wound and there is erythema around the incision without dehiscence. His chest radiograph shows a widened mediastinum with a small pleural effusion on the left. CT angiography shows stranding in the subcutaneous tissue and a fluid collection below the sternum. Which of the following is the most appropriate next step in management?