Review Question - QID 210954

A 65-year-old man presents to the emergency department for evaluation of shortness of breath. He recently returned from a business trip to China, and today developed sudden-onset shortness of breath. He has a past medical history of diabetes mellitus, chronic kidney disease stage 3b and a 50 pack-year smoking history. The patient is non-compliant with his medications and is currently only taking ibuprofen as needed. His temperature is 98.6°F (37.0°C), pulse is 125, blood pressure is 100/65 mmHg, respirations are 30/min, and pulse oximetry is 88% on room air. On exam, he appears to be in respiratory distress. The left lower extremity appears erythematous and swollen when compared to the right. Lungs are clear to auscultation bilaterally. Jugular venous distention is noted. Serum creatinine is 3.5 mg/dL compared to a baseline of 2.0 mg/dL. An electrocardiogram is obtained as shown in Figure A. Which of the following is the most appropriate next step in management for this patient?