Review Question - QID 216374

A 75-year-old woman presents to the emergency department for evaluation of shortness of breath. She reports progressive exertional dyspnea over the last 3 days, along with substernal chest tightness. She has lung adenocarcinoma and is currently undergoing radiation therapy. Her past medical history is significant for hypertension, hyperlipidemia, type 2 diabetes, and a 20 pack-year smoking history. Her medications include atorvastatin, losartan, and metformin. Her temperature is 98.5°F (36.9°C), blood pressure is 95/60 mmHg, pulse is 120/min, and respirations are 23/min. On exam, she has bilateral lower extremity swelling and jugular venous distension (JVD). Her apical impulse is difficult to palpate, and her heart sounds are faint on auscultation. A chest radiograph and electrocardiogram (ECG) are performed, as shown in Figures A and B respectively. Which of the following is the most appropriate next step in management?