A 19-year-old man is brought to the emergency department after being stabbed. Initial survey of the patient reveals a well-developed white man with a blood pressure of 100/60 mm Hg, heart rate of 100/min with no pulsus paradoxus. His airway is class I (Mallam-Patti classification) with some blood in the oropharynx. He has a 5-cm stab wound on his right chest just superior to the right nipple. He has multiple bruises and contusions across his thorax and abdomen. Heart sounds are distant but audible and there are no extra sounds. Breath sounds are clear on the left but diminished on the right. The abdomen is mildly tender in the left upper quadrant. The most appropriate study at this time is a/an
A. abdominal CT scan
B. abdominal ultrasound
C. aortic arteriogram
D. chest radiograph
E. echocardiogram
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