<prompt> A 30 year old male was brought to the ER after a car crash. On admission, pulse is weak with BP8060 mmHg. ECG is shown below. Right hea catheter is placed. Which is the most consistent value with patients diagnosis?RA pressure Pulmonary aery pressure PCWP 16 7530 11RA pressure Pulmonary aery pressure PCWP 16 3416 16RA pressure Pulmonary aery pressure PCWP 16 10030 28RA pressure Pulmonary aery pressure PCWP 16 4522 20  <response>: The ECG shows HR of 125bpm with variation in amplitude of QRS. This occurs when there is large amount of fluid in pericardial sac, which in the setting of trauma is patients own blood. The ECG and clinical history points to diagnosis of Cardiac Tamponade. It is characterised by diastolic collapse of ventricles. Hence the PCWP will be equal to pulmonary aery diastolic pressure. This in turn will be equal to right atrial pressure. 