A 16-year-old healthy adolescent is involved in a schoolyard gang fight and stabbed in the chest with a knife in the left midclavicular line. He is taken to the emergency department and on arrival his blood pressure is barely obtainable. His lungs are clear to auscultation. His heart sounds are barely audible. Which of the following is the most likely acute condition that may preclude his survival?
A. Myocardial contusion
B Aortic laceration
C. Pericardial tamponade
D. Endocarditis
E. Acute infarction