Review Question - QID 109528

A 57-year-old man presents to the emergency department for a strange sensation in his chest and back and shortness of breath. The patient states that he was at home cleaning dishes when his symptoms began. An ECG is obtained while the patient is in triage as seen in Figure A. He has a past medical history of obesity, diabetes, asthma, and depression. His last echocardiogram revealed an ejection fraction of 24%. His current medications include metformin, propranolol, atorvastatin, insulin, and fluoxetine and the patient admits to taking an extra dose of his beta-blocker in an attempt to control his symptoms. His temperature is 99.5°F (37.5°C), blood pressure is 95/65 mmHg, pulse is 120/min, respirations are 19/min, and oxygen saturation is 99% on room air. Radiography is ordered and is currently pending. The patient is started on 100% oxygen and IV fluids. His physical exam is notable for a conversational man who is able to walk on his own with jugular venous distension and bilateral lower extremity pitting edema. Which of the following is the most appropriate next step in management?