question: Q:A 54-year-old man comes to the emergency department because of worsening shortness of breath, bilateral leg swelling, and constant chest pain which is not related to exertion for the last 2 weeks. The patient underwent an aortic valve replacement surgery for chronic aortic regurgitation 1 year ago, and his postoperative course was uncomplicated. He denies smoking or alcohol use. His blood pressure is 80/50 mm Hg, temperature is 36.6°C (97.9°F), and pulse is regular at 110/min. On physical examination, jugular veins are distended, +1 pitting edema is present on both ankles, and heart sounds are distant. Chest X-ray is shown in the exhibit. Transthoracic echocardiography shows large pericardial effusion, chamber collapse, and respiratory variation of ventricular filling. ECG of this patient will most likely show which of the following?? 
  {'A': 'Diffuse concave ST elevation and PR depression', 'B': 'S wave in lead I, Q wave with T-wave inversion in lead III', 'C': 'Right atrial enlargement, right ventricular enlargement, and right axis deviation', 'D': 'Low voltage and beat-to-beat variations in the height of QRS complexes', 'E': 'Tachycardia with discrete P waves with at least three different morphologies'},