Which of the following findings would help EXCLUDE the diagnosis of cardiac tamponade?

A 34 year old male is rushed into the Emergency unit where you are working less than one hour after being stabbed in the anterior left chest. The attending paramedic is concerned about the possibility of a cardiac tamponade. Which of the following findings would help EXCLUDE the diagnosis of cardiac tamponade?

A. Tachycardia
B. Muffled heart sounds
C. Pulsus paradoxus
D. Distended neck veins
E. Blood pressure of 164/104 mmHg