A 74 y/o M with a history of metastatic lung cancer on chemotherapy presents to the Emergency Department with shortness of breath and facial swelling. He reports these symptoms have been increasing for the past 3 days. His PMHx includes hypertension, dyslipidemia, and smoking. His vitals at triage are T 37.4 HR 105 BP 132/76. On examination you note that the veins in his neck are dilated and his face appears red and puffy. There is no angioedema. Which of the following is the next best step?